Pink one was cavitating. That's why it wasn't doing much and making that "rock crusher" noise. Can't really draw much suction against a vapor bubble. That also indicates it's going too fast for that impeller design. As far as testing otherwise, might be interesting to see what kind of head column the different pumps could produce. (The ability to increase pressure or pumping vertically up a tall pipe.) There are more factors in regards to pumping effectiveness than maximum flow rate. Thus in different applications the slower design for this test may still come out as being more favorable.
@@Boz1211111 Actually, it looks like it is. The sound is heard on both the distance and underwater cams, and you can visually see the bubbles inside the pump on the later.
Yes, agree with you. Vacuum capacity could also be a big variable (pump out of water, what intake hose length is the maximum for the pump to initiate flow and pressure). Could be tested both horizontal and vertical (pump above water surface)
'Rpm, amperage, pressure .' Exactly, first thought. You need at least current so you can do current/liter/hour and find the best efficiency when just the fastest rate isn't the priority. Much more useful with just a little more data collected..
Centrifugal pumps are often measured in how much head pressure they can pump against and the flow rate at different pressures. I would bet the 6 blade would come out ahead on pressure.
This was interesting. Changing the battery mid test could skew the results, I suggest a more reliable power supply. Changing the design of the inlet face and size could improve the ability of the impeller to direct the flow. The inlet face seems overly open.
The battery should be charged after every test, actually. Lithium batteries are 4.20 volts fresh off the charger, and drop to a nominal voltage of 3.7V soon after you start using them.
@@tbdcreations5370 The values pressure and flow are already connected to each other, but the more pressure you want to produce the less flow you get @Mafioso Max there are characteristic curves for pumps ... Google ;-)
EumlOriginal You’re right, my mistake. They’re connected but they are tradeoffs, essentially a difference of mechanical advantage. Mafioso Max suggested they both increase together.
It's counterintuitive to look at, but I think it makes sense. The curved blades push the water from center to rim at close to a constant speed whereas the straight blades provide acceleration from center to rim. This creates a stronger negative pressure in the center of the turbine pulling more water in and obviously it pushes water out at a higher velocity, net head being higher than one with curved blades. This would be less important in reverse I believe.
-Make a testing rig having constant head at suction... - try experiment with both CW and CCW rotation of curved vanes. - do another experiment to measure the static head at outlet of each impler.
Please print these designs in their mirror images (opposite parity). The ones you printed are for counter clockwise spin and the outlet on your housing is for clockwise spin.
Incorrect. While somewhat counter intuitive, the vanes of an impeller in a pump are more efficient when they are swept 'backwards'. Consider what you're trying to do with a pump like this - you're trying to *throw* the fluid out and not scoop it in. Backward swept is correct, but something in his geometry was not compatible with his housing, motor speed, inlet/outlet. Pumps are surprisingly complex. What would have been very interesting is to compare the head as well across all these pumps. It may be the case that the red/grey impellers were lower flow but were capable of a higher head. Having a current readout on the motor during the test would have given us some relevant data on efficiency and how much 'work' the pump was doing as well.
This is incorrect way of making a centrifugal pump. See it as an inverted wing of an airplane. When the blades rotate, a negative pressure is formed below the wing (pump blade), causing the liquid to be pulled from the centre towards the blade. Because the inner diameter is smaller than the outer diameter of the pump, the liquid will (with centrifugal force) accelerate outwards and hit the hull of the cochlea. The motion and pressure of the liquid will eventually spin out of the outlet with a lot of force.
This is a cool idea . But you should test the pressure each impeller makes because I think curved blades increase pressure and decrease volume also angled blades do that too I think
I maybe can explain, why gray and pink is less efficient: These pumps rely on centrifugal force, so they pump by pushing the water/air/whatever u pump to the outside. As soon as the blades are curved the motion of the pumped fluid/gas to the outside is disturbed. And these disturbances have the effect of lower efficiency (because every disturbance of the motion of the pumped liquid/gas is an energy loss) Sorry if my eng isn't this flawless, i'm actually from germany ... :)
This is bringing back nightmares. I have worked on BMWS for 30+ years and from 1991-1996 they used plastic impeller water pumps. There’s a service bulletin about it. Every customer with an effected car I urged them to change the pump before it exploded or quit spinning because it stripped the shaft from the impeller. All replacement water pumps had metal impellers. When they blew you really need to get every last piece so you can rebuild it to make sure you removed the debris. It was put together to make sure everything was out of the engine. If you didn’t you ran the risk of a piece clogging a coolant passage and blowing the engine. Running a engine hot is the #1 cause of engine death. 80+% I have put in was due to a overheating issue where the owner drove it until the engine stopped because it locked up. If you cut it off when it starts tow it and fix it you can save a lot of money.
If the gray impeller was connected to the spine, it would have worked better but not as efficient. ,There is actually too much volume of plastic in the design for it to be effective because it is reducing the void available for fluid to enter the chambers. As the old saying goes, it looks good on paper until you use it in the real world.
@@Boz1211111 This pump is clearly cavitating with the pink impeller, this has nothing to do with power and everything to do with geometry. Cavitating in this pump is unlikely to damage the pump because of the low power but it will still drastically reduce pump efficiency.
@@MrAjam12 i thought that impeller is too big for this motor to spin it to such speed to cause cavitation, also, its curved impeller blade, so its even more weird
when looking at pump efficiency you will need to chart the power vs head over the whole range. one pump might perform better at a certain load point but worse at another. you can look how it is done, Google pump curve.
The curved ones were probably more efficient, but the other ones drew more power from the motor so they pumped faster. You have to test the power used by the motor to properly compare the efficiency
But the gray one is most powerful one because pumping 'torque' is higher than others. It is like a 'car tyre air pump'. It can be used if you use it for pump *well water* from the deep of 'well'.
The grey one has low volume but high pressure, while the green and blue ones are a designs for low pressure at high volume! The pink one is medium pressure at medium volume. With tangential wings you need more blades.
It's right this way, first straight turbine blades convert more energy in speed, the others are more suitable for low speed and high pressure. Results are correct
Interesting build. And well done video. I want to give some background information about pumps, as i have designed and tested industrial pumps as an engineer. In general there are three important variables you should measure while testing the pump. The first is the Flow. This is the volume divided by the time, which you essentially measured. The second is the Head of the pump. This is essentially a measurement for the pressure the pump provides. Measuring this can be done in an diy environment by connecting a hose to the discharge side of the pump and measuring the hight, which the pump can increase the water level in the hose to, while the hose is facing upwards vertically. importantefficiency. The efficiency of the pump is defined as (hydraulic Power output)/(Mechanical Power input). For your purpose measuring the Input of electrical Power would be sufficient, as the electrical motor has roughly the same efficiency in all cases. With these three simple measurements you could truly classify your impellers and rate them against each other. This is important as an impeller with straight blades will give you a higher output in pressure, but will worsen your efficiency. That's the reason, why they used straight blades in the case of the car pump. Changing the blades from straight to curved on the small pump won't change the overall efficiency of the car, but will increase manufacturing costs quite a lot. It could be, that your 6 bladed curved impeller will give you a worse Flow and Head, but will do so at an higher efficiency. My guess regarding the bad performance of the red impeller is, that cut blades in the centre will drastically worsen the flow and will induce cavities, which lead to an overall lacking performance and can damage the pump in some cases. It would be awesome to see how your pump and impellers perform overall, especially regarding efficiency.
In my opinion, due to the fact that the pipe is installed on the pump in a tangential way the straight blades were more effective in compressing water in a tangent direction. The concave blades create forces on the water towards the center of the pump and not in a direction tangent to it so less water is compressed into the pipe and from there into the bottle.
The first and the last are the most efficient when it comes to pressurizing distance, these two models that I mentioned are used in centrifugal pumps. A primeira e a última são as mais eficientes quando o assunto é distância de pressurização, esses dois modelos que eu citei, são usadas em bombas centrífugas.
Interesting! Mmm, what will be the value for blue with 8 petals with 45 degrees? But for completeness of the results it was necessary to test in the opposite direction - with water intake from the side and exit from the middle...
You’re likely getting cavitation on all of them but I didn’t have to see the test to know the grey and pink ones with those longer vanes would be slower than the blue and green. If you could seal your pump housing and provide an inlet and outlet what we do on flow benches testing fuel pumps is put a clear piece on the inlet side so you can see the cavitation also different RPMs have different flow rates with a cavitating pump And really great video sorry forgot to be complementary!
excellent test and video .. 40 years ago I had a cooling issue on my four stroke powered R/C model helicopters . . I conducted similar tests to yours . only using air .. not water . The biggest breakthrough was when I faced the cooling fan backwards and sucked the air PAST the motors crankcase prior to directing the airflow over the upper finned half of the motor . There is a two way spin off .. bigger fan equals more airflow .. BUT bigger fans take a lot of power , an amazing amount of power to drive at the 7,500 rpm motor power delivery.
Fact: turbines with bigger gaps between each notch is going to be or will be the fastest/ most effective in water due to to amount of water being pushed out at one time.
That blue one looks like the type you see on snow blowers here in the US. Also were the fins pritprinted right direction and was it spinning right direction?
Did you measure wattage consumed? It would be interesting to track how the wattage and load on the motor changes in relation to the amount of water moved. There's a case to be made for a pump that moves less water while reducing load on the motor. Kinda like F1 racecar motors, going fast for just a few laps is one thing, commuting as a daily driver is a whole other use-case. Still, NICE VIDEO, thanks!
pumps has another very important property next to the volumetric flow rate, that is the outlet pressure. You can't judge a pump without knowing all parameters. There are pumps with low flow rate but high pressure, and oppositely some of them can have very high flow rate but low pressure.
Can You show the drawing of Involute of your pump casing, Red ( backward curved veins ) will perform better than other three, if the involute casing design is just right .
I made a gold dredge pump many years ago. same as the green one. i can add it had great pressure and volume, both needed in getting a gold dredge to work. Thanks for the video.
All my small plastic submersible pumps have impellers same as the first one. However my larger pumps have impellers similar to the grey one. These are all commercially made bought online.
The results are ENTIRELY predictable, but they have nothing to do with "efficiency". Measuring the different pressure created by each rotor at several flow rates would give a clearer result. Monitoring the current draw of the motor at the same time would be even better. It will be found that the rear-angled rotors (all of them except the blue rotor) create less flow when there is restriction to flow _on the output,_ but they also draw less power then. If the motor and battery are strong enough, mirror-image versions of those 3 rotors will pump MORE than the blue rotor, AND put more load on the motor. All perfectly standard stuff from Pump Theory.
You didn't insure that the battery voltage wasn't dropping which would slow the pump motor, I agree that a pressure comparison would also help in determining most efficient impeller. Nice work..
You have to look what is the efficiency of the pump so how many watts per liter is consumed. The other thing is that pumps have usually a flow / pressure curve here you do with the bucket at the same height as the tank but what if the bucket is one meter higher than the tank, will you have the same winner ?
I basically understand curved veins gives you a higher head pressure and lower flow rate and radial or straight veins gives you higher flow rate but lower head pressure if I recall my three or four semesters of fluid mechanics during mechanical engineering
Each of the propeller corresponding to one Pressure-volume curve. You need to apply a certain pressure to testify which one is more efficient. Under low pressure, the first two may dominate, yet under high pressure, the third one wins.
Hey, can you tell about pressures (lift hight example) ? Those blue and green was best of flow (Liters per hour) but I want know would red or gray style be better if need lift water up like +2meters or will blue/green still won?
I think that, if you switch the terminals of the battery you will obtain extremely different results, but you should change with it the input and output of pipes, or/ you can print a new screws of same shape, but of different direction.
Hello friend. Thanks for posting the video. Four impeller designs gave You different results in water flow but be sure that the pressure the pump could reach with each of them also differs. For the pink one, I gues the inlet was close to the bottom or the pump was taking air. For the pressure, I expect the highest pressure from the grey one.
Nice video and good idea but I have some suggestions 1) in some cases there was air in the turbine and this can cause worse performance, 2) You have operated this manually by holding pump in hands wich also cluld make diferences in performace 3) You have not measured presure wich in pumps is very important, becouse performance in liters are strictly dependent from presure or differential hight of outtake - intake. 4) there will be nice if You will create a graph l/min in one axis and presure (hight) in other.
No, no no... Están en la dirección correcta, las de palas rectas pueden funcionar hacia cualquier lado y las onduladas están girando en la dirección correcta, por eso son bombas centrifugas ..... Cogen el agua por el centro y lo hacen pasar por la periferia de cada pala hacia el exterior..... 15 años de mecanico de bombas.... Un saludo.....
@@malloott high speed rotation is often observed as the opposite direction compared to how it's actually spinning. @Rafeeq I assume you're talking about his published thingaverse design? Good thing it was fixed by the time he printed it out in the video, even if not updated(though by now it is). Otherwise he'd get alot more comments lol.
Reprint the curved impellers in reverse. they will work better. Also would like to see maximum head pressure, by running hose up a flag poll. Please do again.
Pink one was cavitating. That's why it wasn't doing much and making that "rock crusher" noise. Can't really draw much suction against a vapor bubble. That also indicates it's going too fast for that impeller design.
As far as testing otherwise, might be interesting to see what kind of head column the different pumps could produce. (The ability to increase pressure or pumping vertically up a tall pipe.) There are more factors in regards to pumping effectiveness than maximum flow rate. Thus in different applications the slower design for this test may still come out as being more favorable.
It wasnt cavitating, looks like hos is against the bottom on that one, wouldnt expect it that much worse than others honestly
@@Boz1211111 Actually, it looks like it is. The sound is heard on both the distance and underwater cams, and you can visually see the bubbles inside the pump on the later.
lol no. the pump has almost 1 atmosphere suction pressure.cavitaion happens when you have to suck the water up a few meters at high speeds.
It may be the battery. If the battery was not fully charged, the last test would result in less power.
what you mean pink, i just see red :)
You should also check how much pressure each generates by having them pump into the hose going straight up and measure the distance.
That's exactly what i was gonna suggest.. Also this is called Pressure head and it is measured in meters
Yeah I agree
@@zakariakhamees Yep, without pressure head the first numbers are meaningless.
i agree, try pumping water to varying elevations, from there you can see how the vanes perform as the height increases.
also amp draw
Interesting! Suggestions for another test: Measurement of Rpm, amperage, pressure .
Yes, agree with you. Vacuum capacity could also be a big variable (pump out of water, what intake hose length is the maximum for the pump to initiate flow and pressure).
Could be tested both horizontal and vertical (pump above water surface)
'Rpm, amperage, pressure .' Exactly, first thought. You need at least current so you can do current/liter/hour and find the best efficiency when just the fastest rate isn't the priority. Much more useful with just a little more data collected..
Exactly.
Say the grey turbine may not provide the flow rate compared to the other's. It may provide better efficiency at higher head pressures.
Centrifugal pumps are often measured in how much head pressure they can pump against and the flow rate at different pressures. I would bet the 6 blade would come out ahead on pressure.
For cleam liquid the close inlet is more eficient. I wold like to see for close
A static pressure test would help show why we have different blade designs.
i bet the grey one would excel at those
Pink impeller looked and sounded like it was cavitating.
I dont care about water pumps or 3d printing but i watched every second of this video, super interesting
This was interesting. Changing the battery mid test could skew the results, I suggest a more reliable power supply. Changing the design of the inlet face and size could improve the ability of the impeller to direct the flow. The inlet face seems overly open.
The battery should be charged after every test, actually. Lithium batteries are 4.20 volts fresh off the charger, and drop to a nominal voltage of 3.7V soon after you start using them.
...that is, if he was to continue using a battery, and not a bench supply, as you suggested, of course.
something about building something that just shoots out water and wasting water is so satisfying
This is what makes 3D-Printing awesome.
Is seems that your rotor was spinning in the wrong direction. and for two turbines the direction plays a role
exactly. I agree
the curved blades reduce the output but increase the pressure
so if you put the canister on >2 meters high you should see more
This comment is correct. You will get higher pressure on the curved blades.
@@court2379 No, it's not. When stationary, increased output pressure also means increased output flow.
Mafioso Max Why would the two be connected? (They’re not)
@@tbdcreations5370 The values pressure and flow are already connected to each other, but the more pressure you want to produce the less flow you get
@Mafioso Max
there are characteristic curves for pumps ... Google ;-)
EumlOriginal You’re right, my mistake. They’re connected but they are tradeoffs, essentially a difference of mechanical advantage. Mafioso Max suggested they both increase together.
when blades are curved rotation of the motor should be so that the blades bush water outwards. Your rotation is like pulling water from outside in.
No
@@angelgonzalez133 : Yes, basics of basic fluids dynamic. You: Go to the back of class!
@@bigcheese781 no go to class again
@@angelgonzalez133 : I understand you "No go class again", thats because you don't understand centrifugal pumps.
Stay in class folks, you'll learn pumps... =)
Very interesting your test, I never imagined that the green turbine would have good results, congratulations and thanks.
Leandro Wagner.
It's counterintuitive to look at, but I think it makes sense. The curved blades push the water from center to rim at close to a constant speed whereas the straight blades provide acceleration from center to rim. This creates a stronger negative pressure in the center of the turbine pulling more water in and obviously it pushes water out at a higher velocity, net head being higher than one with curved blades. This would be less important in reverse I believe.
Waterquw
Call Kant nob
I think that the curved blade is printed in the opposite direction, maybe your conclusions are wrong man!
-Make a testing rig having constant head at suction...
- try experiment with both CW and CCW rotation of curved vanes.
- do another experiment to measure the static head at outlet of each impler.
Please print these designs in their mirror images (opposite parity). The ones you printed are for counter clockwise spin and the outlet on your housing is for clockwise spin.
This is true
Incorrect. While somewhat counter intuitive, the vanes of an impeller in a pump are more efficient when they are swept 'backwards'. Consider what you're trying to do with a pump like this - you're trying to *throw* the fluid out and not scoop it in. Backward swept is correct, but something in his geometry was not compatible with his housing, motor speed, inlet/outlet. Pumps are surprisingly complex.
What would have been very interesting is to compare the head as well across all these pumps. It may be the case that the red/grey impellers were lower flow but were capable of a higher head.
Having a current readout on the motor during the test would have given us some relevant data on efficiency and how much 'work' the pump was doing as well.
I would also like to see the results of the impellers printed in this manner.
This is incorrect way of making a centrifugal pump. See it as an inverted wing of an airplane. When the blades rotate, a negative pressure is formed below the wing (pump blade), causing the liquid to be pulled from the centre towards the blade. Because the inner diameter is smaller than the outer diameter of the pump, the liquid will (with centrifugal force) accelerate outwards and hit the hull of the cochlea. The motion and pressure of the liquid will eventually spin out of the outlet with a lot of force.
Interesting and also useful at the same time
This is a cool idea . But you should test the pressure each impeller makes because I think curved blades increase pressure and decrease volume also angled blades do that too I think
Good to see someone else uses a 0.8mm extruder, and an excellent video too btw.
I maybe can explain, why gray and pink is less efficient:
These pumps rely on centrifugal force, so they pump by pushing the water/air/whatever u pump to the outside. As soon as the blades are curved the motion of the pumped fluid/gas to the outside is disturbed. And these disturbances have the effect of lower efficiency (because every disturbance of the motion of the pumped liquid/gas is an energy loss)
Sorry if my eng isn't this flawless, i'm actually from germany ... :)
the green one is kinda sus
Heck yes. About time for a printing video. Haven't seen one in hours. Thanks!!
This is bringing back nightmares. I have worked on BMWS for 30+ years and from 1991-1996 they used plastic impeller water pumps. There’s a service bulletin about it. Every customer with an effected car I urged them to change the pump before it exploded or quit spinning because it stripped the shaft from the impeller. All replacement water pumps had metal impellers. When they blew you really need to get every last piece so you can rebuild it to make sure you removed the debris. It was put together to make sure everything was out of the engine. If you didn’t you ran the risk of a piece clogging a coolant passage and blowing the engine. Running a engine hot is the #1 cause of engine death. 80+% I have put in was due to a overheating issue where the owner drove it until the engine stopped because it locked up. If you cut it off when it starts tow it and fix it you can save a lot of money.
green - blue test confirmed 👍 ok back to my project
watching more youtube :)
If the gray impeller was connected to the spine, it would have worked better but not as efficient. ,There is actually too much volume of plastic in the design for it to be effective because it is reducing the void available for fluid to enter the chambers. As the old saying goes, it looks good on paper until you use it in the real world.
This video production is quite simple and nice to watch.
You should have recharged the battery after every test to get a fair result. Great test over all
Exactly what I was thinking!
I printed and checked. Works great!!!
Hy. Great test. Can you explain what is the motor rotation direction please? Thank you.👏🙂
The wrong way...
@@jeanguion3223 XD
i agree the pressure would be great. how many meters of tube can you press water in when placed vertically
I love the way you made demo.
Can you test which one is better for Turbine use like water flowing into it to turn the motor
Cavitation on sharp edges are stronger, so the curved blades will last longer I think....
maybe it can do more pressure
This pump is not powerful enough to cavitate
@@Boz1211111 This pump is clearly cavitating with the pink impeller, this has nothing to do with power and everything to do with geometry. Cavitating in this pump is unlikely to damage the pump because of the low power but it will still drastically reduce pump efficiency.
@@MrAjam12 i thought that impeller is too big for this motor to spin it to such speed to cause cavitation, also, its curved impeller blade, so its even more weird
How about static pressure from the different designs? In other words how high of a water column they can hold up. Would be very interesting!
Agree
1:52 "water bump buddy"
great water bump test.
1st , 2st, 3st
Indian accent sux
I hope you charged the battery for each test.
And please do more tests for pressure as well.
when looking at pump efficiency you will need to chart the power vs head over the whole range. one pump might perform better at a certain load point but worse at another.
you can look how it is done, Google pump curve.
The curved ones were probably more efficient, but the other ones drew more power from the motor so they pumped faster. You have to test the power used by the motor to properly compare the efficiency
You should also test it with the Lilly impeller design which is also used for wind turbines it is based on Schauberger design
But the gray one is most powerful one because pumping 'torque' is higher than others. It is like a 'car tyre air pump'. It can be used if you use it for pump *well water* from the deep of 'well'.
The grey one has low volume but high pressure, while the green and blue ones are a designs for low pressure at high volume!
The pink one is medium pressure at medium volume. With tangential wings you need more blades.
Hey, hello. Since is looks like you know a bit about pump impellers, would it be possible for you to say where i could read up on it?
@@FlamingToaster I have not found a good book yet - especially not in English (I'm German)
@@FlamingToaster read Up Viktor Schauberger He has the best Designs when it comes to Water. His philosophy was Understand Nature Copy Nature
@@Humbulla93 thanks, sounds interesting, but I'm more interested in engineering literature on machine design ;)
Very good way to make the mini water pump bursts fast
It's right this way, first straight turbine blades convert more energy in speed, the others are more suitable for low speed and high pressure. Results are correct
Great experiment !
Interesting build. And well done video. I want to give some background information about pumps, as i have designed and tested industrial pumps as an engineer.
In general there are three important variables you should measure while testing the pump. The first is the Flow. This is the volume divided by the time, which you essentially measured. The second is the Head of the pump. This is essentially a measurement for the pressure the pump provides. Measuring this can be done in an diy environment by connecting a hose to the discharge side of the pump and measuring the hight, which the pump can increase the water level in the hose to, while the hose is facing upwards vertically.
importantefficiency. The efficiency of the pump is defined as (hydraulic Power output)/(Mechanical Power input). For your purpose measuring the Input of electrical Power would be sufficient, as the electrical motor has roughly the same efficiency in all cases.
With these three simple measurements you could truly classify your impellers and rate them against each other.
This is important as an impeller with straight blades will give you a higher output in pressure, but will worsen your efficiency. That's the reason, why they used straight blades in the case of the car pump. Changing the blades from straight to curved on the small pump won't change the overall efficiency of the car, but will increase manufacturing costs quite a lot. It could be, that your 6 bladed curved impeller will give you a worse Flow and Head, but will do so at an higher efficiency. My guess regarding the bad performance of the red impeller is, that cut blades in the centre will drastically worsen the flow and will induce cavities, which lead to an overall lacking performance and can damage the pump in some cases.
It would be awesome to see how your pump and impellers perform overall, especially regarding efficiency.
The coolest narration ever 👍👍👍❤️
What about reversing the flow for each? What are the numbers then?
In my opinion, due to the fact that the pipe is installed on the pump in a tangential way the straight blades were more effective in compressing water in a tangent direction. The concave blades create forces on the water towards the center of the pump and not in a direction tangent to it so less water is compressed into the pipe and from there into the bottle.
Only use blue impellers from now on.. 😇
A good test, which takes more energy ?
The first and the last are the most efficient when it comes to pressurizing distance, these two models that I mentioned are used in centrifugal pumps.
A primeira e a última são as mais eficientes quando o assunto é distância de pressurização, esses dois modelos que eu citei, são usadas em bombas centrífugas.
Interesting! Mmm, what will be the value for blue with 8 petals with 45 degrees?
But for completeness of the results it was necessary to test in the opposite direction - with water intake from the side and exit from the middle...
I am wondering if the grey and red are turning in the correct direction?
Hi it would have been awesome if you also compared how those impellers performed on different hight
I feel the pink one would have the highest head
I assume the water displacement is related to the blade resistance during turning in the water. A "vertical wall" has the greatest resistance.
Very good project!!! At 2:00 .. did you flatten the shaft or did you buy it like this? Thanks.
Should spin in the opposite direction or turn the nozzle other direction
You’re likely getting cavitation on all of them but I didn’t have to see the test to know the grey and pink ones with those longer vanes would be slower than the blue and green. If you could seal your pump housing and provide an inlet and outlet what we do on flow benches testing fuel pumps is put a clear piece on the inlet side so you can see the cavitation also different RPMs have different flow rates with a cavitating pump
And really great video sorry forgot to be complementary!
Please can you modify the cover (body 1) so that we can attach hose to it?
Maybe is should be in reverse? Also I would be interested in the efficency and longevity
The Pink and Grey impellors are typically used/optimized for involute pump housings, just FYI
excellent test and video .. 40 years ago I had a cooling issue on my four stroke powered R/C model helicopters . . I conducted similar tests to yours . only using air .. not water . The biggest breakthrough was when I faced the cooling fan backwards and sucked the air PAST the motors crankcase prior to directing the airflow over the upper finned half of the motor . There is a two way spin off .. bigger fan equals more airflow .. BUT bigger fans take a lot of power , an amazing amount of power to drive at the 7,500 rpm motor power delivery.
Did you prime the pump and hose for each oneÉ
Fact: turbines with bigger gaps between each notch is going to be or will be the fastest/ most effective in water due to to amount of water being pushed out at one time.
Im just looking for this , finally thanks
That blue one looks like the type you see on snow blowers here in the US. Also were the fins pritprinted right direction and was it spinning right direction?
Nice idea, but how about sealing the motor shaft? I assume there is a amount of water which slips sooner or later into the motors front bearing.
is there such a model that is installed on jetski, if there is how much it costs
Did you measure wattage consumed? It would be interesting to track how the wattage and load on the motor changes in relation to the amount of water moved. There's a case to be made for a pump that moves less water while reducing load on the motor. Kinda like F1 racecar motors, going fast for just a few laps is one thing, commuting as a daily driver is a whole other use-case.
Still, NICE VIDEO, thanks!
pumps has another very important property next to the volumetric flow rate, that is the outlet pressure. You can't judge a pump without knowing all parameters. There are pumps with low flow rate but high pressure, and oppositely some of them can have very high flow rate but low pressure.
Amazing stuff - well done. I learned a lot as well. Thanks
Yo this man should be in school teaching kids
Can You show the drawing of Involute of your pump casing,
Red ( backward curved veins ) will perform better than other three, if the involute casing design is just right .
Good jobs Sir I learned a lot
Your turbine tests were quite comprehensive. Great insight indeed.
I made a gold dredge pump many years ago. same as the green one. i can add it had great pressure and volume, both needed in getting a gold dredge to work. Thanks for the video.
Very great video. Really appreciate your channel. Keep up the great work brother!
All my small plastic submersible pumps have impellers same as the first one. However my larger pumps have impellers similar to the grey one. These are all commercially made bought online.
The results are ENTIRELY predictable, but they have nothing to do with "efficiency". Measuring the different pressure created by each rotor at several flow rates would give a clearer result. Monitoring the current draw of the motor at the same time would be even better. It will be found that the rear-angled rotors (all of them except the blue rotor) create less flow when there is restriction to flow _on the output,_ but they also draw less power then. If the motor and battery are strong enough, mirror-image versions of those 3 rotors will pump MORE than the blue rotor, AND put more load on the motor. All perfectly standard stuff from Pump Theory.
Useful video 👍
you should try making a pump curve for each of these to see how they perform at different pressures
Did you recharge the battery between tests? The last one might have been slower because it was flat.
You didn't insure that the battery voltage wasn't dropping which would slow the pump motor, I agree that a pressure comparison would also help in determining most efficient impeller. Nice work..
You have to look what is the efficiency of the pump so how many watts per liter is consumed. The other thing is that pumps have usually a flow / pressure curve here you do with the bucket at the same height as the tank but what if the bucket is one meter higher than the tank, will you have the same winner ?
I basically understand curved veins gives you a higher head pressure and lower flow rate and radial or straight veins gives you higher flow rate but lower head pressure if I recall my three or four semesters of fluid mechanics during mechanical engineering
Отличная работа! спасибо за твой труд! Молодец
Each of the propeller corresponding to one Pressure-volume curve. You need to apply a certain pressure to testify which one is more efficient. Under low pressure, the first two may dominate, yet under high pressure, the third one wins.
Hey, can you tell about pressures (lift hight example) ?
Those blue and green was best of flow (Liters per hour) but I want know would red or gray style be better if need lift water up like +2meters or will blue/green still won?
Did you recharge the battery between tests?
I think that, if you switch the terminals of the battery you will obtain extremely different results, but you should change with it the input and output of pipes, or/ you can print a new screws of same shape, but of different direction.
Great job thank you bro
Did you recharge the battery each time?
Hello friend. Thanks for posting the video. Four impeller designs gave You different results in water flow but be sure that the pressure the pump could reach with each of them also differs. For the pink one, I gues the inlet was close to the bottom or the pump was taking air. For the pressure, I expect the highest pressure from the grey one.
Nice video and good idea but I have some suggestions
1) in some cases there was air in the turbine and this can cause worse performance,
2) You have operated this manually by holding pump in hands wich also cluld make diferences in performace
3) You have not measured presure wich in pumps is very important, becouse performance in liters are strictly dependent from presure or differential hight of outtake - intake.
4) there will be nice if You will create a graph l/min in one axis and presure (hight) in other.
Nice background music this is my callertune
But your impaler directions are in oposit direction
Yeah did he spin the curved blades in the direction of the curve? The video makes it seem like he did.
No.. according to his design... the output port wants in right side.. now it is in left side
No, no no... Están en la dirección correcta, las de palas rectas pueden funcionar hacia cualquier lado y las onduladas están girando en la dirección correcta, por eso son bombas centrifugas ..... Cogen el agua por el centro y lo hacen pasar por la periferia de cada pala hacia el exterior..... 15 años de mecanico de bombas.... Un saludo.....
@@malloott high speed rotation is often observed as the opposite direction compared to how it's actually spinning.
@Rafeeq I assume you're talking about his published thingaverse design? Good thing it was fixed by the time he printed it out in the video, even if not updated(though by now it is). Otherwise he'd get alot more comments lol.
Reprint the curved impellers in reverse. they will work better. Also would like to see maximum head pressure, by running hose up a flag poll. Please do again.
Very professional thank you
Cam you also measure the current draw of motor with diffrent blades?
Can height and capacity and time be measured? Thank you
is their any tip to if i make this, How to cool the motor ? i hear they dont do well on long exposure to being used.
the gray its more eficient in electricity i bet ...less drag . measure the watts in the 5L
Joules, not Watts.