Volumetric Efficiency Of An Engine
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- เผยแพร่เมื่อ 6 ก.ย. 2024
- Volumetric Efficiency Of An Engine
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While suction stroke, due to fast movement of piston, the amout of air/charge sucked inside tghe cylinder is a bit lesser than the volume dislaced by the piston. The ratio of the actual charge sucked inside the cylinder to the volume dispalced by the piston is called as volumetric efficiency of engine. Learn About Volumetric Efficiency of an engine by this easy to understand lecture.
thanks .. your every video clear the concept which can not be cleared by the book... thank you so much.. god bless you
Very clear explanation. Really appreciate how you went back and forth with the slides to reinforce the process flow.
sir we increase the time of intake valve to remain open while the piston starts to move upward don't it cause the air-fule mixture to come out through the intake valve which is still open?
(question is from the last part of the video 2nd method to increasing the volumetric efficiency)
thanks
Ya, thats the drawback, however advantage is more
@@Dr.AmitMandal sir today was my internship day and I told my professor these two ways to increase volumetric efficiency he do agree with the first only which was just to increase the intake opening and valve of engine but disagree with the second way and he told me about turbocharger instead.
Elasticity of gases affected by restriction of flow is the primary cause of loss of VE. However, along with elasticity comes compressability. Chrysler Corporation in the late 1950s used this this to measurable advantage on their RB 413"² engines with the Cross Ram option, which used long, fairly straight intake runners that used the momentum of the moving intake charge to compress it when the intake valve closed, negating some of the frictional loss of the valve and its port when the intake reopened for the next cycle. These engines, using dual 650 CFM Carter AFB caburetion, approached the magic number of one BHP per in², partly due to this charge compression feature of its long intake runners. While not as efficient as the original "hemis," the Cross Ram got close, but the hemi was still better at high RPM.
Is there an equation directly relating Volumetric Efficiency to brake torque?
Cleared all my concepts regarding volumetric efficiency. Thank you!
So nice explaination
nicely explained in logical way , I really like it ,thank u sir
Please also explain the purpose and advantage of turbo charge
IC engines topics: th-cam.com/play/PLo1EW04JARVhFr3FAMEgw2XPOe_sdH7Ce.html
So please make vedio time loss factor, Exhaust Blow Down
excellent video
great explanation ...... thank u sir very very helpful this video
thankyou sir but i just want to know the factors effecting the volumetric efficiency please make an another vedio sir you gave an well explanation
engine speed, temperature.
What is the formula to calculate swept volume/stroke volume.
I am confused that in my book it had mentioned that
Vs = A.L and
Vs = A.L.n.K
Were
Vs = swept volume
A = area of cylinder
L = stroke length
n = no of explosions
K = no. of cylinders.
Which formula is correct and why?
You are 100% wrong it is not always just less than the size of the cylinder if you let the intake valve closed about 30 or 40 degrees after bottom dead center momentum of the charge will continue to Pile in the cylinder. You could develop a volumetric efficiency of 150 if you get your cam timing correct
You can watch my lecture on valve timing diagram.
DEAR SIR ,U should use amout of air used instead of charge..!
Because volumetric efficiency is defined as the volume flow rate of air into the intake system divided by the rate at which the volume is displaced..!!
It is irrespective of the engine wheter it is SI or Ci or gas engine , volumetric rate of air flow is what to taken into account and not the mixture flow..!!
Hope u will take it in a positive way..!!
Nice job sir..!!
Thanks
That is air standard volumetric eff. However in practical case for SI engine , taking charge as fluid , it is more practical approach....
But if u will surf any authetic source or standerd books u will found air there..!
I got ur point but still we cant say chRge instead of air intake it will be violation of the defination...!
Google ' volumetric efficiency iit guwahati , download the pdf file and check.
thankyou very much
Sir, If we use a turbocharger or supercharger, then compressed air at high pressure is supplied at the inlet port of the engine. Does it mean that it also increases the thermal efficiency of the engine?
generally
Thank you so much dear sir... excellent teaching...👍👍👍👌👌
By increasing volumetric efficency , can thermal efficency be increased ?
Excellent illustration and explanation. Thank you for creating this video.
please make such morw videos
Amazing Video :). Thank you from Qatar
Thank you sir
the tym delay for which air takes to come inside the cylinder is because of the pressure difference..
The pressure at which the inlet valve opens is above atmp pressure because of the small amount of burnt gasses present on the clearance volume..
the pressure of that burnt gasses are above atmospheric pressure,so to achieve that pressure to drop below atmosphere some tym is taken and once that pressure drop below atm then the air stars to enter inside the cylinder..
That too is a reason, like same when th cylinder becomes hot than incoming air, start expanding promptly when entering inside the cyclinder which leads to less mass accomodating inside however chief way to define vol eff is as i have mentioned in the video.
Yes sir I like your explanation..
But in real senario the pressure and temperature is responsible for that delay na????
Nice
Clear explanation. Thanks!
Thank you sir....this was a great explanation
Bahut badia jnab 👍👍👍👍👍
if the engine is at low rpm then will the efficiency be greater then at higher rpm
Yes, it seems so
what a clear expalanation! Thank u sir...
It will be ODC and IDC for the present orientation of the engine, not TDC and BDC
One question, if the piston is in BDC and which is after the expansion stroke , what will happen to the unburnt fresh charges, which will enter by closing the inlet valve at a time more than the actual closing time?
+Niaz Ahmad refer my lecture ' valve timing diagram' on the same channel
helpful
Great explanation ....Have no words
Excellent video. Thank you..
What software are you using to make those illustrations?
+arunnath1198 , it's not software , it's chain of images made on paint brush by me...
Amit Mandal Oh. But PowerPoint is so much better than paint in my opinion.
can vol.eff. be increase by supercharging?
ya but generally not done....
Thank you for your clear explanation
The author of this video completely misunderstands the meaning of the term "Volumetric Efficiency" when applied to an IC engine. A piston engine is a positive displacement pump, the pumped volume is defined by the bore/stroke and never changes. VE is a mass ratio, not a volume ratio. The correct equation is:
VE=(MASS_actual)/(MASS_theoretical)
And there is no such thing as "vacant space" under the air charge in the cylinder. This very concept defies physics and fluid dynamics.
Reference - www.sciencedirect.com/topics/earth-and-planetary-sciences/volumetric-efficiency
www.sciencedirect.com/topics/earth-and-planetary-sciences/volumetric-efficiency
what about adding a extra inlet valve?
Sir aapka explaination is awesome
sir, is there any difference between the swept volume and the displaced volume?
it can be more then 1 and even 130% we can achieve
Only with deisel engines with supercharging
You are such a nice person 💕 💛 💗 ❤ 💓 💖 💕
can u explain the other efficiencys also
thanks for clearing the concept sir
Thanks
Thank you
Thanks!
Amazing brother
Volumetric efficiency is directly proportion to compression ration..? M I right.? Pls correct me..
+Câptaiñ_Amêricä *** directly proportional , not possible, however the major factor on which VE dwpends is speed of engine , the inlet valve diameter..
Nice explanation .......
nice explanation sir
I have a question how to calculate clearance volume of Engine?
+Marinebd it is the cylinder volume - stroke volume....
Each part of engines are made speretly so u can simply calculate it by putting the cylinder head down and pouring water in it..!!
Those led balll test and otherexperiments are not fruitfull coz the shape at valve is ont symeetric..!
TQ man....
super sir
doubt clearing video
OK thanks sir
mass ratio not volume ratio
ßs
thank you