12 a

 To use a rotor as a series expander it is required to have control
 valves in the two valleys of the trochoid, in addition to two exhaust
 ports. In addition, it is necessary to adjust the volume displaced by
 the second rotor. On the other hand there are large thermal losses,
 nonexistent in a turbine. To this the mechanical losses are added. A
 turbine, on the other hand, is a flexible device capable of expanding
 gases completely, with high gasodynamic efficiency and minimal
 thermal and mechanical losses. In addition, it is a more compact
 device.


 In a turbocompound, the perispheric ports prevent effectively
 separating the intake manifold from the exhaust manifold. This makes
 it impossible to work with large pressure differences between both
 ducts, necessary for the implementation of an efficient
 turbocompound; where the pressure of the exhaust manifold is several
 times the pressure of the intake manifold. The operation would occur
  with continuous expansions of Joule-Thomson, with the corresponding
 generation of entropy and destruction of useful work. Gretings from
 Argentina. Lisandro Rodríguez

 Since we got 650 HP out of a 200 pound two rotor throwing away a lot
 of the exhaust energy the turbine type turbo compound would be much
 lighter in weight.

 Paul Lamar


Looking at the drawings that were attached: I had thought one
would use a geared drive. It didn't occur to me to use a belt
drive system.

This caused me to think of the CVT transmission type operation.

Would it be more efficient, overall, to use a variable torque
system to drive the engine in an effort to get all the power we
could for/from turbo-compounding. And would that particular type
of "coupling" (more similar to that used by a snow-mobile) be of
less weight, with more efficiency in the drive across the RPM
range of the engine?

Remember, I'm not a mechanical engineer, just more of a mechanic
that "plugs" things together that engineers invent.

Regards,
Steve Thompson

What is important is you get max torque out of the turbine if the speed
of the blade is half the speed the exhaust gas.

The 12 to 18 inches diameter turbine directly  mounted on the E-shaft is the lowest cost way
for turbo compound. No gear box no belts. Therefor most efficient. Variable blade angle
will widen the torque recovery range  verses engine RPM.

To not build and test this is idiocy. The Wankel has no exhaust valves that waste
20 % of the exhaust energy and will rev to 10,000 RPM.

Paul Lamar

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