Last updated on Wednesday, September 16, 2020 11:51:29 AM Mountain US Time Zone
Stirling Engine, Double-acting Steam Engine
A Stirling "coffee-cup" engine. Stirling Engines are
facinating devices that I find far more interesting
than steam as they are self-contained devices using
more exotic materials, requiring much tighter machining
tolerances, & are thus harder to design & fabricate. As an
application example, I have used a mid-wave infrared (MWIR)
(3000nm to 5000nm) imaging system that incorporated a
Stirling Engine to cool its sensor for lower thermal noise.
Click to see video. Pre-heated base.
A pressure/volume graph of the idealized Stirling cycle.
Alpha- & Beta-Type Stirling Engines.
Beta-type rhombic Stirling Engine.
Click on linked thumbnails
Double-acting Steam Engines
A double-acting bronze steam engine machined from a rough
castings kit. The base is red oak with routered radius edges & rubber feet.
Click on photo for a video showing the engine running on compressed air.
Both a mill & a lathe are needed for this project. A problem with kits is that
the amount of material per part is minimized making it harder to grip when
machining, possibly necessitating designing & machining a fixture, which in
general is not a beginner's project. Not being able to hold close tolerances
results in undesirable "wobbly looking" engine flywheel performance, (DA).
Double-acting Steam Engine