Paul and all,
We would be bleeding pressure from the 45deg ATDC big push on the rotor.

But my problem is with the original premise... that we should divert the hurricane flow.
And secondly that we should add surface area... both of which are a detriment to the Rotary.

The spark kernel needs turbulence to develop quickly.  It is also helped by compression and temperature.
Attached is a quote from Sir Harry Ricardo.

On the GM patent I think if we could change the stainless by-pass inserts to non-bypass vacuum SS inserts (think thermos bottle) to minimize heat loss it would be a great help.

Barry Bordes

Why do you think surface area is a problem? There will be no combustion under a metal plate on top of the rotor. I am sure General Motors checked that before they applied for their patent. The area  is too thin at .1 inch to support combustion.

A very important part of this idea is to relive the high pressure in the area where the aft part of the rotor is in close contact with the wall of the rotor housing. That will reduce the velocity of the wind storm.

There is also not a reduction in pressure due to squish flow under the top plate on top of the rotor. There is a slight reduction in compression ratio but that could be made up  with a shallower bath tub.

Turbulence is fine but a wind storm on top of the rotor blowing the mixture down stream is something else. That blows the combustion away from the optimum e-shaft angle.

Yes I agree about a vacuum's ability to insulate but ceramic rotors have been built with no significant improvement in BSFC. I suspect GM found that out when the tested the 2 piece rotor.

It is called the adiabatic Wankel but it was a big disappointment.

The flow in the combustion chamber is the only really significant difference between the Wankel and a piston engine.

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BTW if your planing on direct injection it may be better to inject up wind.

Paul Lamar

Paul,
    Are you saying that there is not enough turbulence in the combustion chamber, therefore reducing the speed of the flame front ? if so , maybe a simple "paddle" across the rotor "bath" could stir it up a little.
    Chris Hoskins.

IMHO there may be turbulence but there is a also wind storm that is blowing the combustion
away from the optimum e-shaft angle. Enough to reduce the BSFC 5 to 10%.

The three dimensional CFD is this paper is very advanced.

Paul Lamar

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