Hi!: interesting info, as always. The SAE paper by D W Garside about the
Norton Rotary development includes the references for Fin calculation,
one of the NACA articles is in a link in the Wikipedia Wankel and
Sleeve-Valve engines, I scanned the article by P V Lamarque, but the
result was of poor quality, I'll try finding time to have a better copy
later.
The theoretical results of the Florida University by using Heat Pipes
for lower and more uniform temperature in Wankel are impressive, I have
the hunch that with this arrangement, placing the hot zone at bottom
will ease heat dissipation, but it's hard servicing plugs in the sump
side of engine.
Advanced Cooling Technologies sells heat pipes, at least for electronic
uses, and a 3 mm thick one will be probably enough for the UEL type of
drone engine.
A Heat Pipe Assisted Air-Cooled Rotary Wankel Engine for Improved
Durability, Power and Efficiency
2014-09-16
Technical Paper
2014-01-2160
Wei Wu, Yeong-Ren Lin, Louis Chow
Our goal is to eliminate the hot spots and reduce the temperature
gradients in the engine housing and side plates by aggressive heat
spreading using heat pipes. We demonstrate by simulation that, for a
specific power requirement, with heat spreading and more effective heat
dissipation, thermal stress and distortion can be significantly reduced,
even with air cooling. ...We demonstrate by simulation that, for a
specific power requirement, with heat spreading and more effective heat
dissipation, thermal stress and distortion can be significantly reduced,
even with air cooling. ...Abstract In this paper, we address the thermal
management issues which limit the lifespan, specific power and overall
efficiency of an air-cooled rotary Wankel engine used in Unmanned Air
Vehicles (UAVs). Our goal is to eliminate the hot spots and reduce the
temperature gradients in the engine housing and side plates by
aggressive heat spreading using heat pipes.
Somebody with the courage of implimenting this?
Thanks, best regards, + Salut
Jose Gros-Aymerich
Madrid, Spain
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