Paul,

Are most turbo compounding units axial flow or are there centrifugal
flow units as well?

Thanks,

Bruce Smith


Both have been used but the F1 guys are using centrifugal
flow. Basically just turbo charger turbines  with generator on the shaft.
Not the most efficient way of doing it.

The best is a gear box that reduces the high rpm to e-shaft speeds.

I have one from a DD15 with gear box from 40,000 RPM to 8,000 RPM.
Suitable for a 3 rotor that I will sell for $2,000. It is axial flow.

Paul Lamar

    Paul, did you ever put any effort towards the Blow Down Turbine?

    Steve Carlisle


    If you mean running it on a dyno the answer is no. I did not have the $650
    a day to do that. About that time I got an invitation to make a presentation
    at the World Motor Sport Symposium in Oxford England. This is a gathering
    of the world's top Formula One engine designers. The video is on the web site.

    http://www.rotaryeng.net/Oxford-640-4802.mpeg

    As a result of this electrical hybrid turbo compound was adopted by the
    Formula One governing body as mandatory. Not the most efficient way to do
    it but if the race car is either full throttle or full braking that is a lot
    of energy to be recovered.


    Paul Lamar

    Paul, I am referencing this idea,

    Steve Carlisle

I never built that but I did find some turbines about the right
diameter in an aircraft junkyard. They came out of an early
Lear Jet engine. Go up this road to get there :-)

Paul Lamar

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