Sterling volume/stroke data and opinions

[TheDogofWar]

This is my basic design idea for my first build, the rendering could be better but I've only got autocad map to work with. The proposed materials are oak and copper. I've chosen these materials because they are easy to work with for my lack of tools and also provide a bit of visual appeal.

First off, can someone point me towards some formulas for calculating proper cylinder volumes and stroke/volume data? Do the diplacement and power pistons have the same stroke?
The displacement cylinder right now is 1.25" ID and 4" long using a about a 1"x3" aluminum piston and the plan was to drive this off a tealight or alcohol burner. The power cylinder has an ID of .5" @ 1.5" in length.

I added the wood strip around the middle of the displacement cylinder as a thermal break, I was concerned that too much of the heat would be transferred through the copper, do you think that would even be a concern?

Opinions, suggestions, concerns?

 

[black85vette]

Try ordering "Introduction to Low Temperature Differential Stirling Engines" by James R. Senft

He has done a lot of true research on them and includes some plans on building.

Stirling engines are pretty tricky. They have to have very little friction and almost perfect sealing. Sorry, I don't know enough about their design to give you advice.

 

[Bluechip]

Been thro' this before ..

reply #3

http://www.homemodelenginemachinist.com/index.php?topic=5951.msg63174;topicseen#msg63174

Best of luck

Dave

 

[black85vette]

Forgot to mention: nice drawing! Thm:

 

[TheDogofWar]

Been thro' this before ..

reply #3

http://www.homemodelenginemachinist.com/index.php?topic=5951.msg63174;topicseen#msg63174

Best of luck

Dave

Thanks for that Dave, IDK how I missed that during my search but that's exactly what I needed and I seem to have gotten lucky and am falling right near those numbers. All but the cooling/heating area ratios which does surprise me. Not a problem, I will just move the thermal break.

Forgot to mention: nice drawing! Thm:

TY, nice vette. Have you done anything to her?

 

[Bluechip]

I just did a search on 'Stirling'.

But I did know it was in here, so I had that advantage.

You've got it, that's the main thing.

Dave BC