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Author Topic: Stirling engine type?  (Read 1070 times)

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Stirling engine type?
« on: May 23, 2021, 12:09:12 am »
Though I’ve been curious for years, I never messed around with stirling engines.
So, I ordered this desk fan. It hasn’t arrived yet, but in the meantime I’ve done just enough reading to get confused about the stirling engine types. Best I can tell, this engine falls either under alpha or gamma type engine. Anybody know which type it is?  Also, roughly what rpm can I expect from such a design? Thanks in advance.

https://www.enginediy.com/products/thermal-power-stove-fan-vintage-stirling-engine-physics-science-experiment-energy-education-tool
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Re: Stirling engine type?
« Reply #1 on: June 08, 2021, 06:53:44 am »
Hi, Jack!

I am honored that I also own one. I am glad that you are curious about the Stirling engine. This engine is of the gamma type. Because it imitates the fan, the speed is designed to be between 450-700 rpm. If the firepower is increased, the speed may be higher. ;)

Layne
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Re: Stirling engine type?
« Reply #2 on: June 08, 2021, 11:39:52 am »
It’s a gamma type engine. The displacer cylinder is separated out from power piston cylinder. The 90 deg phase is achieved using crankshaft
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Re: Stirling engine type?
« Reply #3 on: June 10, 2021, 09:40:23 am »
Thanks
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Re: Stirling engine type?
« Reply #4 on: June 11, 2021, 10:50:07 pm »
PM Research sells a fan which is a Beta type which is very high quality.
https://www.pmmodelengines.com/shop/solar/solar-engines/solar-engine-6/

As designs go generally: alpha is best, then beta then gamma.

Gamma is inefficient due to a large "dead' volume.
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