Subject: Napier Nomad
From: Rotary Engine
Date: 9/7/2008, 5:44 PM
To: AAA Put this in the To box


I just found the reference to the lowest recorded SFC in an aviation
engine.  The 1950 Napier Nomad with a 0.36 SFC turbo-compound,
supercharged 12 cylider diesel 3,000 hp.
http://en.wikipedia.org/wiki/Napier_Nomad  Now, that's a
worthy challenge to beat with a 16X rotary engine. (not the hp, the SFC)

Greg


They have one in the Ottawa museum as well as the Smithsonian.
Here are some pictures I took at the Smithsonian.

Paul Lamar

-- 

I looked at the drawing again and see that the axial compressor feeds the
diesel and that the diesel's exhaust drives the compressor and feeds power
to the output shaft as well.

This looks more like a gas turbine in parallel with a diesel.  Where is the
turbo compounding?  Is it the small  percentage of exhaust passing through
the turbine's power turbine stage?

George Lazik


Yes but not a small percentage. About 40% of the total energy in the fuel goes out the exhaust of the 2 cycle sleeve valve diesel engine in the form of waste heat and kinetic energy.

The  diesel engine does some of the compression and all of the combustion as well as sending most of the power to the output shaft. The exhaust kinetic energy from the two cycle diesel is fed to the turbine to recover some of the other wise 40% waste energy in the exhaust and feed it into the output shaft. Note; the big advantage of this engine, over the Wright R3350 turbo compound engine and like the Wankel rotary, there are no exhaust valves to dissipate kinetic energy.

Paul Lamar

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