Bladeless fans and their flows
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- เผยแพร่เมื่อ 23 เม.ย. 2019
- Have you ever wondered how bladeless fans work? This is the video for you. Little to no previous knowledge required to understand what is being described although it would help if you already know what bladeless fans look like.
After all of the reading I have done in an attempt to understand this, you managed to make it all click in 10 minutes. Thank you!
enjoyed your description of the inner workings. thank you.
Perfect explanation! It is always important the way how you teach the complex subject to the audience. Thank you!
Excellent, simple explanation. Well done!
Keep it simple, you did and now I under the basics of blade/less fan propulsion. Thank you
Like all these others, I have studied this, but never understood it until now. The Entrainment and its multiplying effect is the little KEY detail that it seemed was always left out. Thank you!!!
Absolutely the best explanation I have seen. Great vid mate!
Great for using as an office desk fan and when you're watching TV or reading
Thank you for your time and teach !!!
So clever ! Now I understand why it doesn't need a big noisy fan ! Thank you so much, very instructive !
depends on how much air you want to accelerate and to what velocity. They can be extremely noisy in propulsion applications. I am here to study what we can do to make them quieter while still getting the exit velocity and volume required.
Excellent info & video, easy to understand, very well done, TY!
You Sir are a True RESEARCH & KNOWLEGE DISTILLER. Thank you. Please continue your work.
Thank you very much for this explanation. I understood it nicely. And I really like the way you explained it. This has helped me lot!
Didn't expected such a wonderful explanation Wow 🔥
Great explanation for the coanda effect... Thank you 👍👍
Great Explanation, simple and clear, Thank you !
This is an awesome and very informative explanation! Bravo!
You really are great at giving explanations congrats! Keep it up
Excellent explanation. Best one I have seen!!
beautifully made video, with clear explanation. Thank you ever so much
Verry clever way of using the wind for thrust.I understood everything 🙂
Well done. A clear explanation of a little understood principle.
I have the basic understanding of aerodynamics and this video explains it perfectly. Thanks for sharing 👌👍
Now that was Very Interesting and Well Explained
great job! thanks for sharing this information
Very good explanation, I learned something new.
Thank you. Perfectly explained.
Thank you. Well explained
Phenomenal , thanks
Awesome, thank you.
Very nice explanation.
very educational. thank you sir.
Good explanation!
finally an explanation that i understand. thank you.
Thank you SO MUCH!
Great work sir
Fabulous vide3o and explanations! Thank you.
Beautiful
So good, thank you really much
Thank you sir for the wonderful explanation
Great explanation , thx
very nice simple and clear thanks
Excellent explanation
Well explained. Thanks
Wow. This the best explanation for the bladeless fan. This will help to design my hobby project to make bladeless fan in 3d printer. I would enjoy more such videos
Hi, I'm curiouse have you build a 3D fan yet?
wow, i think i got it now, or at least neart got it. great job explaining .. wow, i think i have and addition or two for this level of propulsion. thank
Even I can understand your explanation, thank you.
I really enjoyed this video and its content.
Very cool video. I myself just got a 3d printer and just started on CAD and for the very first project wanted to build a bladeless fan. I'm at v4 and checked out this video to see if I did everything right to find I am spot on. The only difference with my fan, which I haven't tested yet, was to move the air intake to the very back and am wondering if that could help air flow at all? All fans I have seen air is taken in from the bottom.
Thank you SO MUCH for not adding the silly "R" to the end of Coanda Effect! The first video I watched about this was from an English guy who said "Coander" 100 times, was excruciating! Don't get me started on the silly extra syllable injected into aluminum.
Thank you ❤️
Thank you for explaining. This is by far the best explanation I have seen so far. Does the entrained airflow help with lowering the low pressure area? making the unducted airflow stronger?
VERY NICE VEDIO, NICE EXPLAINATIO, NICE VOICE QUALITY.
Thank you.
It is like in jet engines, now I know how they have so much power thanks to you !
Thank you
very good
Very interesting video. The bladeless fan multiplies the air quantity flow. For it to work well with an aircraft the air must be accelerated at the exit and not increased in pressure. although it would work ok with a slower flying aircraft. It would be interesting to see a comparison with a conventional electric ducted fan (EDF) showing power consumption and thrust between both bladeless and conventional fans.
if you are idiot, everything is "interesting", especially SF movies th-cam.com/video/dS0oFmzU06g/w-d-xo.html
The air entrainment add-in CFM effect is minimal at best with this Dyson design!
what is the name of this phenomenon for combining the coanda effect to create the 15x air pressure
You're an awesome teacher on this subject....is there something like this that's used to super change an engine? I think I saw something like this somewhere and used for supercharging .
What about the constant back pressure the compression fan has to fight to maintain and create, would that require a constant high amperage demand from the power supply? Wouldn't this be a major problem to overcome when trying to implement this into aircraft when weight is a major factor for battery system needed for sufficient flight time?
Makes a nice fan, just seems that the only gain in actual propulsive force is the inducted air from the intake side. The entrained air on the exhaust side does nothing for thrust? Will need to see more
Thank you... :)
thank you.
could one be designed than run from the convection off a tea light?
i built one from tin cans and ran it on ethanol for some interesting results.
Nice!
? The entrained air is past the a/c so how does that help with propulsion or lift? Does it cause more to be inducted?
If this structure were outside and swiveled towards the wind, could the lower mount fan plus inducted air and also the entrained air produce enough energy so that a ducted air generator makes more electricity than the mount fan? Thinking of this as a small to medium device. Home or RV solutions. I'm thinking about the camping angle. Too much is about solar panels but hybrid electrical input should equalize weather changes and power needs.
Lo ví traducido al español
Te agradezco haberme explicado dónde está el truco, al parecer éste tipo de turbina o complemento de turbina promete mucho para las aerolíneas, que sus aviones son de motores de rotores coaxiales osea el rotor del turbo reactor está por fuera y el rotor de los ventiladores enormes que vemos dentro de las cáscaras están por dentro del turbo reactor, y demasiado texto ya muchos se la saben pero algunos quienes me lean no entenderían… pero quienes entiendan ésto promete mucho reemplazando por completo esos ventiladores pesados y esos enormes cascarones osados por unos más funcionales y también reemplazando los turbo reactores por unos más pequeños ó por motores así como del que llevan en la cola del avión que no me acuerdo cómo se llama
Thanks
Very clear explanation, thank you!
Using this principle, I saw a thing called "Joptera" that uses electric "bladeless reactors". I understand that between the primary air flow (from the column), the inducted air and the entrained air.
However, I wonder how efficient the system is in terms of energy, as they (Joptera) claim a huge reduction in power consumption.
Thus, for a same 1kW electricity consumed by a motor, how can I compare the thrust/power output between, say, a ducted fan and a bladeless fan (I suspect the size may need adjusting)? My suspicion is they're losing a lot of power in friction and the inducted+entrained air is proportional to the force/airspeed and the viscosity of the blown fluid but I'm not sure how to formulate the hypothesis (it probably has something to do with the laws of thermodynamics and the conservation of energy, I guess).
Also, in the case of a wing, would it make sense (e.g. to reduce/deflect drag) to put blowing fins just behind the camber towards the trailing edge?
Hi, your comment is sound. I also have doubts about the real efficiency on Jetoptera.
Anyway if you wish to compare thrust of any kind of two types of fans you can simply alow the fan to pull on a weighing scale. This is a kind of static thrust measurement.
I came here because of that video myself bro.
I think for now the bladeless fan is ok for ventilation where air multiplication is desired. Not so good for an aircraft where accelerated air at a lower pressure is needed, and not to mention the power consumption, complexity and weight. Everything has a price. When something is gained there is always a loss. Very interesting video.
What altitude ceiling do you think this technology might reach the? stratosphere?
Are they using compressed air to start it up or injecting fuel like a jet engine for added thrust?
do you think this design could be reverse teched and become a bladeless wind turbine?
Verry well done! I was looking to do some tests for a RC plane propulsion system but after some reading it seems this system doesn't have so much potential for propulsion systems...
It may be ok for a nice cooling fan in house but not for generating efficient thrust for a plane.
Not sure anyone did any tests on RC?
jetoptera?
@Ranmacar Something like that. I'm not sure small Reynolds numbers will be advantage or disadvantage? Also not sure iduction how far from the surface is effective. This needs tests. And I'm thinking, for ease of build it will not be build circular (like a ring ) but linear like a biplane but the surfaces closer. That's the basic plan.
Shouldn’t the surface of the exit air be curved like a typical airfoil to increase lift?
Yea I get that the flow from the gap generates more flow from the surrounding.
But what really matters is how much flow you can get per unit energy, and whether it’s better than a normal fan.
I have been looking for tests like this. Have you seen any that make this comparison?
@@t_c5266 no, but the fact that there's no airplanes doing this, tells me it isn't more efficient.
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Or another way to look at it is that air multipliers are monumentally more expensive than regular fans... a full A.M fan may be able to move 15x more air than the internal fan which runs it, but if it costs $500 can it produce 10x the breeze that a $50 fan does? Not so sure...
Is it possible to run fan in reverse and make it act as vacuum cleaner?
Is it possible to make such fan in large size? say square share 4x4 feet?
Greetings ladies and gentlemen of this comment section.
As a formula student racing car enthusiast. I was wondering if a blade less fan can effectively suck more air than a bladed fan ?
We intend to use a fan on our upcoming competition car, but we’re not too sure whether the blade less far will work as well as a bladed fan.
Thank you in advance
This airflow induction, entrainment, produces 15x's times could be recycle into another air hoop
with 15x's the power, to produce another inducement, and entrainment and so on, the possibilities are great
I imagine this could be a multiplier of air force.
Do you know why this system is not used in aircraft propulsion yet?
This design seems to highlight Induction and Entrainment in a circular wing in order to produce more thrust. I would think higher lift on a straight wing would benefit from the Colanda Effect rather than circular wing, A circular wing's lift would have the increased lift, if there is any, cancel each other out from opposing directions of the circle. Lift from the top part of the circular wing would cancel the lift from the bottom part of the circular wing. Side lift forces would be lost energy. A higher flow from the slot at the top of a fixed wing would increase the Colanda Effect lift. IMHO minimizing the drag forces inside the wing from the forced air flow as it's directed out the slot at the top would be the major problem to be solved.
i saw jetoptera and fell in love
can this method be used in an airplane wing?
Actually it is not Inducted but rather Induced
Inducted applies to a person being installed into an organization or function, while induced is to be lead by persuasion, compelled or influenced (like magnetic fields)
Technically correct, the best kind of correct :P
Perhaps an aircraft wing, which is more flat on the bottom and curved on top would aid understanding.
Could that idea be extended to water to say, propel a boat?
So would you say a "bladless" fan puts out air better that a normal one?
If it works In air, can I assume
It will work in water? Basically a ram jet? Anybody ? Got any thoughts on that or how about applying it to a vertical windmill
So if you were building a bladeless airplane; Can you take a turbine engine, direct it towards an air foil then to a hollow air foil, will it be multiplied 30x instead of 15x?
Why not show the flow using some enhancement, lasers with particulates, for example. Can you see the “tunnel” of low pressure or is it just too busy with the entrainment happening.
This explanation is very good, thank you ! However, it needs some time to REALLY get it. Allthough the physic and mathematic is shown the mental image stays quite difficult.
I have been wondering about a "bladeless drone" and have seen plenty of hypothetical designs but very few working prototypes using the same principles. Also such a drone could actually be made totally bladeless if it used a monopropellant like HTP. There are however lift assisted aircraft using similar concepts but none use a circular duct that I've seen.
Maybe,self propelled wind turbine blades , then you can combian centrificail force also
May I join this fan club
What you get in volume, you lose in speed, right ?
It's a cool mechanism though
so is this more efficient than a bladed fan..yes or no..
does it move more air per kw of power..yes or no
Maybe efficient (but the horizontal fan have a smaller diameter than a bladed fan), but not cost effective.
th-cam.com/video/dS0oFmzU06g/w-d-xo.html
The basic concept of conservation of energy tells me that a traditional fan should be a lot more efficient because all the electric power is used to move the air without wasting any energy in the form of friction in the convoluted air path of the "bladeless" fan. I hope Dyson use better bearings/motors to compensate this lack of efficiency, but if you threw the same amount of money at a traditional fan, you'd get better efficiency
@@anthis127 convolution in the path surely adds some resistance, but I suspect here it's lower than your expecting.
my instinct says no, this requires compressed air to work and compressing air is a highly inefficient thing to do as allot of energy is wasted in heat
Your explanation was great. Now the big question is why isn't it being used in commercial aircraft if it has any advantage over standard airfoil designs? My guess is there is no advantage over any commercial design.
You may want to check out this video. th-cam.com/video/bPZI6XoHi10/w-d-xo.html
@@wesbaumguardner8829 I don't think the tests done so far use this system. All of the videos of the a/c inflight show the EDF, not the bladeless system. The BL system looks cool and probably cost a lot more. But unless it gets much better with thrust, it won't be used on full size a/c.
@@hifinsword You are correct. They are pretty sneaky.
@@wesbaumguardner8829 I am a fairly new RC plane modeler. So far I've only built 2 aircraft from scratch. After watching that video and a few others, I'm wondering if I invert the cross section design so that the airflow goes to the top of the airfoil, it would give the wing better boundary layer control and improve the lift along the entire wing. Building such a plane would be time intensive. And I have a 6th gen fighter or SST model I want to build first. But this does interest me to see if a high lift, yet fast a/c can be built using a modification of this idea. Here's my pusher prop build of the XB-70. th-cam.com/video/6onRX7thN0U/w-d-xo.html
and my SR-71 build. th-cam.com/video/PThsS5iXwnI/w-d-xo.html
@@hifinsword I think the increased airflow over the top of the wing will increase both lift and drag, but I am no engineer and have never built anything. I am curious as to what would happen if a Tesla turbine was used to create the airflow instead of an impeller.
TRUTH: NO SUCH THINGS AS BLADELESS FANS. You are right about the Coanda effect, and cheers for also stating the truth: about the fact that deep inside every so-called "bladeless" fan there is a blade fan that creater the airflow used by the Coanda efffect .EXCELLENT VIDEO. B.T.W. Henry Coanda was a Romanian Engineer
So if that be the case then, if I create a larger more powerful fan with better airflow INTO the tube - this would result in an even greater effect? - if this is the case, then I have a further suggestion based on physics. If the vertical tube starts off at say 250 mm - and the TOP of the tube is reduced to say 200 mm......this would mean that the air is being compressed just before it enters the chamber....resulting in an eve GREATER amount of low pressure and entrained air ( vortices ). thus with the calculation of 15x the increase in total air volume, the fan should become very powerful.
More powerful than it would be if the up-lift tube were the same diameter at both ends - correct? because essentially, this is how a jet turbine works.
see Jetoptera
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