Interesting RESONANT(?) Stirling Engine

This engine was developed from a previous engine where I realised that the flywheel was not necessarily necessary.

I am interested to have any comments or links to similar engines as I have not seen anything quite like this one before (this, of course, does not mean that it hasn't been done before).

If this is your sort of 'thing' then please visit www.youtube.com/mowerofdoom for more engines I have built.

The glass engine in the beginning of this video is also featured on my channel.

Thanks for watching!
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Category:

Science & Technology

Tags:

• Laminar
• Flow
• Stirling
• Engine
• thermo
• acoustic
• thermoacoustic
• glass
• piston
• interesting
• free

[Mucktallbloke]

That engine can be thought of a mass damper system. Any mass damper system will have its unstable region where oscillations will occur that will neither increase or decrease in amplitude. You just have to tune the engine resonant length to match the mass damper unstable region where the amplitude neither increases or decreases. Job done. I can't remember what effect the orifice size has on the system though. It was a while since I did this. Get yourself a book on control systems. :) :)

[mowerofdoom]

@Mucktallbloke Thanks for the comment. Very interesting. I have noticed that the engine runs well with some piston masses, but quickly becomes damped when the mass is changed. I understand the mass/air column freq. The natural freq of the heat/cool cycle I am having difficulty understanding (never mind calculating!). I think one practical clue is the direction of drift of the piston when running. I am guessing the air/mass system is inclined to drift towards the other freq. What to you think?

[kurisu925]

I say put a neodymium magnet in the piston and a coil around the cylender to generate power. Also the extra movements of piston after the heat source is taken away is just the heat that is left behind in the tube being used up.

[mowerofdoom]

I did progress this in another video in the manner you suggest. Have a look at the link below if your interested :-)

youtube (dot) com/watch?v=cAyw_dOioMU

Cheers. Geoff.

[ansar68pk]

Good work .... though the necessity of necessarily necessary brought a smile :)

[mowerofdoom]

Cheers. :-))

[jamiemh76]

Natural systems have a resonant frequency. You are observing this in your video. If your piston had a greater mass, it's resonant freq would be lower and vice versa. Once you start adding extras to a Stirling engine, such as a load, you require a flywheel. This uses the momentum of the flywheel to propel the piston past it's "balance" point. Why am I so bad at explaining stuff that I can visualize lol....

[MilanKarakas]

Oh, btw. You mentioned that if piston is to heavy it will not work. That is because piston itself perhaps has it's own resonant frequency. If so, then it will be good to experiment with different weight of the piston to match that two resonant frequencies: one of the hot side, and another of the piston itself. What you thing about that idea?

[MilanKarakas]

Another excellent work, and amazing discovery. What about using copper pipe for piston area in order to encourage faster cooling (better heat transfer)? Okay, then it will be no transparent, but perhaps it may work better. What you think?

[crudeoilsystems]

fascinating show.

[Andonovmil]

Try to put kind of spring or sometnig on piston it might make it faster

[prankmakers95]

how does it work? check out my Dalek 2.7.wmv : )

[jalobeaulieu1]

can i ask you how big was the hole in the connection for the two tubes?

[eplu]

Hello, is it indispensable to have a reduction at the cylinder? or does it work without

greetz fron germany

[cstottsb]

@Mucktallbloke yep i'm pretty sure they are inversely proportional

[cstottsb]

@Mucktallbloke yep i'm pretty sure they are inversely proportional