This idea has been around for 25 or more years.  It's common practice in
diesels.  Porsche just adopted it for the 911 Turbo after spending years
perfecting the high-nickel superalloys needed for the parts to survive.
I doubt it will be suitable for rotaries because the exhaust temperature
is excessive. Don Sherman

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All problems are not show stoppers. Adopt a positive attitude.
Almost every idea that passes the physics test will work but
there may be a few problems to solve.

One can always cool the rotary exhaust by 100 or 200 degrees F with
a heat exchanger and make steam. Then use the steam to drive
the accessories with a tiny steam engine like BMW is working on.

Even simpler... re-injected the steam into the turbine as is commonly
done in power plants to cool the turbine and add to the kinetic
energy.

You still have twice as much kinetic energy in the rotary
engine exhaust to drive the turbine than any piston engine has.

Paul Lamar ...No rotor no motor.

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