Stirling Engine Blowby?
Stirling Engine Blowby?
(OP)
Hello all! I have been trying to do some research on this subject but cannot seem to find much. I understand there is some blowby in a gasoline or diesel engine, but what about a Stirling Engine? Since it is an enclosed system of gas, how is that handled? Is the force too low for there to be a blowby effect because of the gases traveling between pistons so the force is dissipated before it can blowby?





RE: Stirling Engine Blowby?
The ones that I've read about are completely hermetically sealed including the crankcase (if there is one) or integral alternator/generator (if there is one). Any leakage past pistons gets contained in the crankcase and the pressure and contents of the crankcase is the average of the engine's operating pressure, so leakage will be in both directions and average out to zero. The BMEP of a Stirling engine is pretty lousy and the difference between peak cylinder pressure and minimum cylinder pressure isn't much, so sealing of piston rings (given that the crankcase has the same gases in it) might not be so critical.
No one has put one in the hands of the average consumer and put 200,000 miles on one.
RE: Stirling Engine Blowby?
The delta P is so low that leakage is nearly nonexistent.
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P.E. Metallurgy, Plymouth Tube
RE: Stirling Engine Blowby?
The 'net says that the US project was cancelled.
Easy Refs:
https://en.wikipedia.org/wiki/Stirling_radioisotop...
https://en.wikipedia.org/wiki/Advanced_Stirling_ra...
(Wiki itself provides more authoritative links, in case required.)
RE: Stirling Engine Blowby?
There are ones here on earth that have been run for years in testing also.
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P.E. Metallurgy, Plymouth Tube
RE: Stirling Engine Blowby?
They were called STM when I visited them about 20 years ago, and had several units running durability at the time.
I think they sell the complete generator sets to landfills and livestock farms etc.
This patent may be helpful: https://www.google.com/?tbm=pts#tbm=pts&q=US+8...;*
PJGD
RE: Stirling Engine Blowby?
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