> Hi Paul and group,
  >
  > A question regarding kinetic energy. How do one measure the
  > level of
  > kinetic energy at the exhaust. An instrument placed at the the
  > two or
  > three exhaust exit. Is it just that simple?
  >
  > Marc J.
  >
  > Kinetic energy is just the blast of exhaust gas coming out of
  > the engine.
  >
  > You can get one of these wind speed meters and hold it near the
  > end of the exhaust pipe. Put the car on a chassis dyno and run
  > it up
  > to full power. Note the airspeed of the exhaust. That would be
  > the airspeed
  > coming out of an annular shaped orifice in front of a turbine
  > with the
  > same cross sectional area as the exhaust pipe tip.
  >
  > If you consider the turbine blade a wing
  > with a lift coef. of one.. the force on the blade would be .0026 times
  > the relative air speed squared in MPH times the area of the
  > blade in square feet.
  >
  > The torque is the number of blades times the force on each blade
  > times the radius of the blade. Good turbine blades can have lift
  > coef. up to two. Max turbine power is generated when
  > the tangential velocity of the blade is about half the max exhaust
  > gas airspeed.
  >
  > The gas speed out of the exhaust pipe tip will be reduced by
  > the heat loss in the muffler and the rest of the exhaust system.
  > --

  > Paul Lamar ...No rotor no motor.


 Has anyone have a measured total value of the amount of kinetic energy
 from the exhaust port of a Renesis engine for example?

 Marc J.


 Not yet to my knowledge. I just recently had the idea in the last
 couple of hours  of using the wind speed meter on the exhaust pipe
 of a car on a chassis dyno. As far as I know that is an original idea.

 You can get a good idea however from the measured heat balance. Usually
 about one third of the waste heat/HP is kinetic. The RX8 engine is not
 significantly different than the old 13B.

 BTW we have a new youtube video on the Detroit Diesel turbo
 compound engine.

 http://www.youtube.com/watch?v=luoUHrX6DeQ

 Everybody please click on the furthermost star to the right.
Paul Lamar

Is this for turbocompound energy calculation?  Seems like there's
going to be a fair amount of frictional and cooling loss in the long
tailpipe and automotive muffler - loss which a turbocompound shouldn't
have to suffer.  I guess as a worst case method of estimation is would
still be interesting.


Matt-

True Matt