> 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 ...No rotor no motor.

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