This sounds very much like "stratified charge" which can reduce
pumping losses much like
a "Diesel" . However, direct injection runs into the same mixing
limits as a "Diesel"
which can limit full power output levels. I think the last time I
looked at Mercury
data the direct injection engines were rated lower HP than the port
injected same
model. Direct injection can be a double edged sword in this way - it
improves effective
volumetric air efficiency - particularly when compared to vaporized
fuel mixtures,
but makes uniform distribution for high power output more difficult. -
Vance

-Matt Prather wrote:

While I agree with Paul that more effort should be placed on turbo
compound instead of other exotic things like direct injection...  If you
are power limited with direct injection because you can't get enough
total vaporized fuel into the chamber, why not suplement the DI fuel
delivery with plenum mounted injectors?   For max power, both the DI
system and the plenum systems will spray, but for best economy, make
the fuel management system turn off the external injection first.

Paul, can turbo compounding and turbocharging be used in the same
system?  Or is the ultimate setup for an airplane going to be a P-port
(for volumetric efficiency) with a turbo compound?

Regards,

Matt-- 

All sorts of combinations are possible. Supercharger and blow down turbines
were used in the R3350. Turbocharger and blow down turbine in the Cat.
Normally aspirated and blow down turbine.

Paul Lamar
 
The Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2004 All world wide rights reserved.