06/09/2004
If you are quick enough to realize that any supercharged engine, either
turbo or mechanical, is easily capable of having excess air for the
desired power, and you feel that intercooling might be desirable, then
perhaps, US Patent 4665714 issued to BBC Brown, Boveri & Company,
Limited (Baden, CH).  

It deals with the use of a Laval Nozzle as part of an intercooling
system.  How effective can that be?  From the patent:

"If the pressure of the compressed air after the charging air cooler
amounts to about 2 bar and its temperature is 80.degree. C., then the
branched-off cooling air can without difficulty be accelerated by the
Laval nozzle 7 to twice the speed of sound. Then the air temperature at
the entry to the heat exchanger tubes amounts to about -75.degree. C"

Anybody here care to thing of passing -75 degree or colder air thru the
intercooling heat exchanger from excess air?

The laval nozzle increases the speed to well past the speed of sound,
with more available pressure gives more supersonic acceleration.  As the
air speed mach number increases, the greater the heat transfer to the
air that occurs for a given area.

Anybody here care to think of an intercooler that gets both colder and
transfers more heat as the pressure builds up?

Next to consider is air ejector.  Used in WWII and by Tatra - ( ya know
- the company where Dr Ferdinand Porche did his apprenticeship and later
borrowed one of their standard engine and copied it almost exactly in
Volkswagen and Porches air cooled engines).  In the early fifties Tatra
was running air cooled V-8 at american power levels in cutting edge
commie technology displacement engines.  Many racing engines were cooled
this way.  But that's before your daddy was a gleam in your
grand-daddies eye.  References available to those that may actually give
a crapola about useless old technology.  Heck, this stuff is so old its
only 50 years newer than the time when overhead cams were considered
cumbersome and obsolete old crapola.

Anyway, an exhaust driven ejector system was sufficient to nicely cool
an air cooled highly competitive racing engine.  Typically can move
between 4 to 10 times the cool air mass of the exhaust air mass.  Part
of the reason turbos were not overly popular on WWII fighter aircraft -
as in many cases, the jet thrust available from an ejector system was
greater than the power increase of a turbo charger.  Those old phucke
american engineers that didn't have a clue compared to the Greatly
Advanced New Technology Jew Burning Crowd of Clowns, even went so far as
to use the radiator in a naca duct to heat the air passing thru it
enough to generate a low pressure jet to completely counteract the drag
loss's of the radiators. ( P-51 ).

Consider then the concept of a push me pull me system, where excess air
is bleed off the compressor thru laval nozzles into an intercooler and
then draw out the engine by a post turbo ejector setup.  

Nobody would think about that as an idea to pursue.  Except maybe Dick
Datson when he is not obsessed with black helicopters.  He has been
talking about a "New" and different way of intercooling with his Gator
System.  No bets - just a guess.

Oh, btw, the air passing through the intercooler and into the ejector -
will be about 1/3 or less the temperature of the turbos exhaust.  Any
clue of what happens to the pressure of super hot air when it is
suddenly severely chilled?  It drops - radically.  So the more
intercooling air passing through the system, the greater the pressure
drop aft of the turbo.  

Anybody here care to contemplate a system where as the boost pressure
increases, the back pressure against the turbo decreases?

Carefully note that the cooling air entering the intercooler does not
have to be all from the supercharger.  One may use the nozzles to force
more air thru the system by the use of an air injector pump - with a
significant improvement it total cooling air flow.  

Nobody would be interested in high subsonic continuous air flow through
the cooling air side of an intercooler right?

And, btw, someone may start to think real stupidly that since we have
some excess air, we might be able to use a little more, like running a
few laval nozzles thru a liquid air system such as an oil or gasoline
chiller, where viola - as the boost(load) increases, the cooling
increases.  And heavens to betsy, my god, they might even think of
running some tubes thru the radiator and cool the engine also.