This is how long we have been working on turbo compound.

Paul Lamar
===========================================


-------- Original Message --------
Subject: Turbo compounding. Is it pratical?
Date: Fri, 24 Jul 1998 03:10:46 -0700
From: Paul <rotaryeng@earthlink.net>
To: bit@any

George Moore wrote:

   Eureka !, Sketch 2 with the addition of the compresser, really
clarified the whole concept !  So essentially, the power harnessed by
the blowdown turbine counteracts the parasitic loss of the belt driven
compresser to a degree, minus operating efficiencies of the components.

A wee bit more subtle than that. The fact of the matter is you can get
more energy out of the exhaust than you really need for supercharging.
That is why the BSFC goes down on a turbo compound as opposed to merely
just turbocharging.

This is sort of an exponential effect so the real HP limit is the
detonation and structural strength of the core engine. And here is where
the rotary engine scores big time.
The structural strength to weight ratio is exceptional.  I also suspect
the otherwise bad surface to volume ratio of the rotary combustion
chamber is an asset at high boost levels.

I hope that is clear.

Paul


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