> > 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.
>
> Dear Paul and all:
>
> Since "(m)ax turbine power is generated when the tangential
> velocity of
> the blade is about half the max exhaust gas airspeed", does that mean
> that my idea of several turbocompound fans, each hit directly by one
> Renesis side exhaust port, each fan directly connected to the e-shaft,
> would not work? See the first attached simple diagram.
>
> I designed my turbocompound fans to be generally the same size
> as the
> rotors. See the second attached simple diagram.
>
> I based my design on your end-on turbocompounder design, Paul
> (see fancy
> 3-D image {attached} :-). It seemed to be about the same size
> as the
> rotors. But, I could be in error about your 3-D drawing, Paul,
> and am
> open to correction. :-)
>
> It sounds like, for the turbine to generate the maximum amount
> of power,
> it must be twice (or at least, a much greater diameter than) the
> diameter of the rotor, which accelerates the exhaust gas to its
> maximumspeed. The exhaust gasses would, therefore, be ducted
> out of the rotor
> up to the turbocompounder fan(s). What is the correct view on
> this matter?
>
> Thanks!
>
> Les Nordman :-)
>
>
> Interesting idea. It will be a cooling challenge as the entire
> end housings
> will be subject to the exhaust heat. The exhaust port must
> converge into a 360
> degree nozzle with roughly the same area as the port. That
> suggest some
> excessive heat lost to the cooling system. Keeping the exhaust
> as hot as possible,
> up to the turbine, consistent with the max TIT capabilities of
> the turbine blades,
> is desirable.
>
> If you significantly separate the two rotors you then may have a
> torsionalvibration issues with the E-shaft. Then of course you
> have a cost issue with
> four turbines instead of just one.
>
> I can't really say what is the optimum diameter of the turbine
> until we
> measure the average exhaust gas velocity. There is no doubt a
> supersonic pulse
> emerges from the exhaust immediately after the port opens but
> what is the average
> exhaust gas velocity? This supersonic pulse has not proven to be
> a problem for
> turbo charger blades so far. I suspect the main thing killing
> turbo chargers,
> besides the high heat, is over speed.
>
>
> BTW I will be in Florida for the next 20 days so the newsletter will
> be published sporadically. I hope to be in the pits for the
> Rolex GT race at Homestead this coming week end. If you want to
> contact me send me private email to this email address.
>
> Paul Lamar ...No rotor no motor.

So Les you are the one who got me started on this side port exhaust :))
I just cant get it out of my head.

Paul and Les:  What do you think of a one rotor situation with just one
turbocompound turbine?  After a full circle through the exhaust back in
the turbo.  How much kinetic energy is in the exhaust at the exhaust
port.  I asked this question before but patience will prevail.

Marc J.

I don't know exactly Marc. My guess is about 100 HP worth in a two
rotor and half that for a one rotor. BTW side ports are not going
to help.