A marriage of the turbo fan and the Wankel.

The axial compressor section feeds high pressure air to
he Wankel intake. It is further compressed   ten times
by the Wankel. The Wankel exhaust drives the turbine shaft which
goes through the center of the e-shaft forward to drive the fan.
It could go into a gear box and drive a propeller.


With a 4 rotor engine  each single Wankel rotor assemble  could be
rotated 90 degrees. That would simplify the exhaust and intake ducting
if any was
needed and improve the flow of the gases in general.

An annular air to water heat exchanger could be inserted between the
axial compressor and Wankel air intake to cool the compressed
intake air.

I like it.  One of the simplest configuration of a turbo compound
Wankel.

It is very similar to my version with  the turbine mounted on the
e-shaft
only simpler.

I'll work on a 3D when I get time.
 ------------------------------------------

Here is the Rolls Royce Wankel turbo fan in 3D more or less.

Amazing idea. The main issues as I see them is to have the
concentric shaft
stiff and strong enough. Another issue the the shape of the intake and
exhaust ducting. If one makes them fan shaped skin friction drag
becomes
an issue.


Paul Lamar

Paul,
That is truly an interesting idea. It gets the turbine thrust just like
a jet.
If people have ever seen one this reminds me of the Napier Nomad.
This is just one step more direct putting the rotary inside the fan section!

Bill Jepson

As far as gas flow aerodynamics is concerned the Napier may be better.
I think the RR arrangement will lose a lot of Wankel exhaust energy in skin friction drag.
The Napier had 320 pounds of exhaust thrust in addition to the prop thrust.
That is the main reasons it had a lower BSFC  than the R3350TC.
World record low BSFC for all types of aircraft engines.

Of course the Wankel versions would be much much simpler and have more
exhaust thrust.

Paul Lamar

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