A couple days ago Chris asked how much a turbo could do if no wastegate was
used.  Of course the answer is highly dependent on many factors such as
ambient conditions, intercooling, mixture, etc, etc.  That said, I fired up
my spreadsheet and got this answer.  If you run 6500 RPM you should get
around 400 hp at 77 in-hg MAP and about 51 lb/min airflow (S.L., 100 deg
inlet temp).  If you go up to 8000 RPM the number is more like 500 hp.  I
guessed from the question that maybe the goal was to use the "excess" exhaust
for some other purpose.  In this case at about 240 hp, 6500 RPM, 46 in-hg MAP
there is about .16 lb/sec flowing through the wastegate with an exhaust
pressure of about 40 in-hg and an assumed EGT of 1650.  (Note that the
pressure ratio across the engine is highly positive at 46/40 indicating that
the BSFC would be noticably better than N.A.)

Are you gonna tell us what you have in mind??

Jeff Spitzer

Thanks for your response.  What I'm interested in is using a vortex tube to
recuperate the exhaust energy for intercooling, augmenting radiator cooling
air, or airconditioning.

Chris

You must have read my mind Chris. I was thinking of putting one in the suction
mode on the intake of the turbo to cool the air going in. I guess it would
also work as an intercooler on the output of the turbo in the blow mode.

How's the airplane coming? Are you going to make the Copper State race?
Now that Tracy has wheel pant fairings and better oil cooling he might try
to collect the Everett Hatch Memorial $500 prize for the Copper State Dash.

BTW Rumor has it Dan Wright and Jon Sharp along with the Lockheed
Skunk Works are working on a side by side two place 56 square foot wing
area Lancair IV beater for Reno. It will have a Cont O-550 twin turbo. They 
need to sell it as a kit to qualify so somebody could build one with a 
900 HP turbo three rotor and PT6 gear box and blow them all into the weeds.

Paul Lamar
 
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