I don't know why this video has got so many dislikes, it's actually a very good explanation, especially when the animation stops and it's explained what's happening. Good video.
One of the problems, I think, with understanding the Stirling engine, is the name "displacer". Its task is not really to move the gas from one end of the cylinder to the other (although it DOES do this in most cases) it is to alternately shield the gas from the hot and cold surfaces. It is better considered a moving insulator than a displacer.
@Wilkenawa Thanks, I'm glad you like it! There should be a difference of 1/4 turn between the piston and the displacer. So when the displacer is at the bottom of the air chamber, the piston should be in the middle of the cylinder on its way down. That way the air is on the cold side and the contracting cool air can pull the piston down. Note that it can run in reverse too if the top is heated and the bottom is cooled. Then the warming air would push the piston up.
Apart from the mistake in phase still this is the best animation, because it is simple and focusing on the important part. I would appreciate very much if you could fix this one but without any enhancements that are distracting. Once more, animation, and length are optimal on this one.
Hello - The piston moves up when the gas inside is heated, but notice that by the time the piston reaches the top, the displacer is on its way down at the halfway point. The gas in the cylinder isn't pushing or pulling the piston at that point. So when the piston is at the top, the momentum of the flywheel is needed. The updated version of the video might help explain it better because in there I stop at each 1/4 turn and explain. In here I only stop and explain at each 1/2 turn.
A good simplified explanation but as a potential Stirling builder i would have liked to have seen more information on angels of the crankshaft etc. Thanks for sharing.
Best explanation I have seen on TH-cam so far, except you need to fix the annotation at timemark 1:20 to 1:22 to separate the text into two sections. Sterling engines remind me of analog circuits, unlike internal combustion engine, which can be compared to a digital one. By the way, the piston is double acting, it is pushed in one direction by the expanded gases, ( when heated ) and pushed back in the opposite direction by atmospheric pressure when the gases are cooled and contracted.
that makes sense, so whenever the piston is designed to be a top/bottom when the displacer is half way point, hence neither expansion or contraction is occuring due to temperature because cold end and hot end have the same volume effect on gas. So that the momentum of the flywheel at this point is designed to "tip" the balance. thank you
As I understand it now about half of the cycle is made up of thermal expansion and contraction of the gas which pushes and pulls the crank shaft. The other half consists of mechanical compression and expansion of the gas which pushes and pulls the heat from the cold and hot plates respectively. So part of the energy in the flywheel is used to actively move the heat through the gas. If you look again at about 1:20 when it says "flywheel momentum" is where mechanical compression happens.
In the first part of the animation this stirling should rotate in the other direction. Trying to explain how it works I think this is rather important.
What I'm kind of confused about is, when is the displacer driven by expansion/contraction by temperature change, and when is it by momentum of the flywheel?
Thanks for the good video, i have at little question. Does the crankshaft have to be installed so the piston and the displacer is at the same point of each "cilinder"?
Sorry for more questions, but when it seems that the intercooling process is done during or after the compression of the gas? In an ideal Stirling cycle shouldn't the cooling take place before the compression?
It seem as though there is a large clearance fit between the displacer and the outer cylinder? what type of fit should there be between the piston and the smaller cylinder?
Why is it that if the bottom plate has a higher temperature than the top plate it moves clock or counterclockwise, and if the bottom plate has a lower temperatur than the top it moves the other way arround?
@alabala327 Hello - As I understand, you're asking about the displacer (the part that appears at 0:38)? The rod that the displacer is attached to, which pokes through the top of the airtight container (see 0:17) has to be sealed as well as possible so that air can't get through but the rod can slide as freely as possible. The displacer itself has a smaller diameter than the airtight container so the air inside can freely flow between the top and the bottom.
So is it safe to say that the temperature of the gas in the cylinder can be approximated to be uniform and are only function of displacement of displacer?
sure . why not . but we know , that man will try to change color of it . and will not be satisfied after used them all . later he'll throw gps in to it . even promising that it is a last thing he need to make it perfect . but remember , he may be ny-orker . and winters are more satisfying in fl . it would still be with in gps promise to apply a bit of fl heath ? well ok , but his ex may go also . getting older makes you smarter , but slower ? time will tell ....
This is a hot air engine, and technically not a stirling engine, as I see no regenerator. Very similiar of course, but technically what makes a Stirling engine a Stirling engine is the regenerator. Unless of course the displacer is acting also as the regenerator, and in which case sorry for the complaint.
Friend sorry it will not work because when the displacer rod is at the top the small piston which is called power piston cannot lift or rotate the wheel.Its due to the size of piston area.the wheel will be locked.Pls check it.
Hello and thank you for the feedback. The proportions of the parts in the animation are not precise. The goal is more to explain the concepts. The description links to a newer version of the video that shows the running engine the animations were based on and a better description of how it works. But the proportions of the parts are not precise in either video.
No. in fact it mustn't. The displacer must move through the working gas from top to bottom and vise-versa, some displacers are perforated, and I have seen one using a steel displacer. This improves efficiency, and as Kimberly Peacock points out, would better match the name "Stirling engine'. Hi Kimberly.
The hot and cold sides aren't chambers. They are hot and cold sides of the same chamber (or cylinder). If you haven't already seen the other video on my channel, watch that. It is an updated version of this video and it explains a little better. Hope that helps!
Or I am a slow reader or this is a bad video. When the text comes up you try to read one and then the other one is gone! Make them disappear slower. Peace
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I don't know why this video has got so many dislikes, it's actually a very good explanation, especially when the animation stops and it's explained what's happening. Good video.
Thanks, after searching through a number of 'explanations' on TH-cam and elsewhere, this animation makes it very clear indeed. Excellent!
One of the problems, I think, with understanding the Stirling engine, is the name "displacer". Its task is not really to move the gas from one end of the cylinder to the other (although it DOES do this in most cases) it is to alternately shield the gas from the hot and cold surfaces. It is better considered a moving insulator than a displacer.
@Wilkenawa Thanks, I'm glad you like it! There should be a difference of 1/4 turn between the piston and the displacer. So when the displacer is at the bottom of the air chamber, the piston should be in the middle of the cylinder on its way down. That way the air is on the cold side and the contracting cool air can pull the piston down. Note that it can run in reverse too if the top is heated and the bottom is cooled. Then the warming air would push the piston up.
Concise, informative and beautiful 3D graphics.
bro the first 13 seconds has the most unsettling music
this video, among hundreds of the best.
Thanks Michael! After viewing this video I understand really how stirling engine works!
Apart from the mistake in phase still this is the best animation, because it is simple and focusing on the important part. I would appreciate very much if you could fix this one but without any enhancements that are distracting. Once more, animation, and length are optimal on this one.
Plain , finally . Thank you.
Hello - The piston moves up when the gas inside is heated, but notice that by the time the piston reaches the top, the displacer is on its way down at the halfway point. The gas in the cylinder isn't pushing or pulling the piston at that point. So when the piston is at the top, the momentum of the flywheel is needed. The updated version of the video might help explain it better because in there I stop at each 1/4 turn and explain. In here I only stop and explain at each 1/2 turn.
A good simplified explanation but as a potential Stirling builder i would have liked to have seen more information on angels of the crankshaft etc. Thanks for sharing.
Very good show
Best explanation I have seen on TH-cam so far, except you need to fix the annotation at timemark 1:20 to 1:22 to separate the text into two sections.
Sterling engines remind me of analog circuits, unlike internal combustion engine, which can be compared to a digital one.
By the way, the piston is double acting, it is pushed in one direction by the expanded gases, ( when heated ) and pushed back in the opposite direction by atmospheric pressure when the gases are cooled and contracted.
that makes sense, so whenever the piston is designed to be a top/bottom when the displacer is half way point, hence neither expansion or contraction is occuring due to temperature because cold end and hot end have the same volume effect on gas. So that the momentum of the flywheel at this point is designed to "tip" the balance.
thank you
As I understand it now about half of the cycle is made up of thermal expansion and contraction of the gas which pushes and pulls the crank shaft. The other half consists of mechanical compression and expansion of the gas which pushes and pulls the heat from the cold and hot plates respectively.
So part of the energy in the flywheel is used to actively move the heat through the gas.
If you look again at about 1:20 when it says "flywheel momentum" is where mechanical compression happens.
Thank you so much that is an amazing animation.
thanks i finally see how this engine works, my pea brain is all happy now !
In the first part of the animation this stirling should rotate in the other direction. Trying to explain how it works I think this is rather important.
What I'm kind of confused about is, when is the displacer driven by expansion/contraction by temperature change, and when is it by momentum of the flywheel?
Thanks for the good video, i have at little question. Does the crankshaft have to be installed so the piston and the displacer is at the same point of each "cilinder"?
Sorry for more questions, but when it seems that the intercooling process is done during or after the compression of the gas? In an ideal Stirling cycle shouldn't the cooling take place before the compression?
It seem as though there is a large clearance fit between the displacer and the outer cylinder? what type of fit should there be between the piston and the smaller cylinder?
I mean does the piston have to be at the bottom of the cilinder when the displacer is at the bottom of the air chamber? is that important?
Why is it that if the bottom plate has a higher temperature than the top plate it moves clock or counterclockwise, and if the bottom plate has a lower temperatur than the top it moves the other way arround?
i think so, this video is perfect
@alabala327 Hello - As I understand, you're asking about the displacer (the part that appears at 0:38)? The rod that the displacer is attached to, which pokes through the top of the airtight container (see 0:17) has to be sealed as well as possible so that air can't get through but the rod can slide as freely as possible. The displacer itself has a smaller diameter than the airtight container so the air inside can freely flow between the top and the bottom.
Thanks for explaining this! I want to make one now, anyone know and decent videos or PDFs?
stroke of both piston same?
weight of displace?
all dimension of engine?
So is it safe to say that the temperature of the gas in the cylinder can be approximated to be uniform and are only function of displacement of displacer?
sure . why not . but we know , that man will try to change color of it . and will not be satisfied after used them all . later he'll throw gps in to it . even promising that it is a last thing he need to make it perfect . but remember , he may be ny-orker . and winters are more satisfying in fl . it would still be with in gps promise to apply a bit of fl heath ? well ok , but his ex may go also . getting older makes you smarter , but slower ? time will tell ....
A very large one half submerged in ocean or lake and solar heated on top!
This is a hot air engine, and technically not a stirling engine, as I see no regenerator.
Very similiar of course, but technically what makes a Stirling engine a Stirling engine is the regenerator. Unless of course the displacer is acting also as the regenerator, and in which case sorry for the complaint.
Friend sorry it will not work because when the displacer rod is at the top the small piston which is called power piston cannot lift or rotate the wheel.Its due to the size of piston area.the wheel will be locked.Pls check it.
Hello and thank you for the feedback. The proportions of the parts in the animation are not precise. The goal is more to explain the concepts. The description links to a newer version of the video that shows the running engine the animations were based on and a better description of how it works. But the proportions of the parts are not precise in either video.
displacer is 90 degrees out of phase (ahead).
Had to watch in slow motion to be able to read it all.
does the big piston (the bottom one) need to be perfectly sealed?
No. in fact it mustn't. The displacer must move through the working gas from top to bottom and vise-versa, some displacers are perforated, and I have seen one using a steel displacer. This improves efficiency, and as Kimberly Peacock points out, would better match the name "Stirling engine'.
Hi Kimberly.
thanks.
What is Hot and Cool chamber?
The hot and cold sides aren't chambers. They are hot and cold sides of the same chamber (or cylinder). If you haven't already seen the other video on my channel, watch that. It is an updated version of this video and it explains a little better. Hope that helps!
So the piston moves up after being heated and it's forced down against the hot end gas by the momentum of the flywheel?
i'm glad my comment is catching on.lol
Hi - This was made with Blender.
the displacer IS the regenerator
INCORRECT!
Please re-think the audio. It would be nice if you added some useful dialog.
👍👍👍👍👍👍
if i give small external energy to drive the displacer alone (i,e, without flywheel) can i still extract greater enrgy through power piston?
@andresfb75 That is why God invented the pause button
Humm? Can you please tell me what program did you used to create this animation? Is it Cinema 4D? If yes..Can you PLEASE send me the template?
Song plz?
+HaydenHatTrick Hello - It is called "The Annual New England Xylophone Symposium" by DoKashiteru. dig.ccmixter.org/files/DoKashiteru/19848
Still i Don't understand.
no fregues
Helooo..hiiii
Awfull music.
chlordk says the guy with less subscribers.... this is a great video all around!
Or I am a slow reader or this is a bad video. When the text comes up you try to read one and then the other one is gone! Make them disappear slower. Peace
sumhow stil dont understd
too slow