Paul,

Have you seen any development, theoretical or practical, of the following:

Aircraft have a unique opportunity for using a compounding turbine's
shaft energy.  The cooling drag for an aircraft engine is about equal to
the energy recovery from turbo compounding.  Both are 10-15% of the power
output.  Connecting an exhausting fan directly to the recovery turbine's
shaft could push the cooling air from the cowling at free stream
velocity or greater.

When the outlet velocity matches the inlet, cooling drag vanishes.

The simplicity of a lightweight volute or shroud and an exhaust pipe
could replace the complexity, weight, cost, and potential problems of a
gear train and its safeguarding mechanisms.

Thanks,

Philip Groelz


That is a real good idea Philip.
Here is something similar.


Paul Lamar ...No rotor no motor.

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