Date: Mon, 08 Oct 2001 17:49:09 -0700
From: Robert Harris 
Subject: Boring non bolt on stuff
To: fanglers@buick.gnttype.org

Laval Nozzle - a convergent divergent nozzle that accelerates a fluid to a
supersonic speed.

If the pressure of the compressed air amounts to about 2 bar and its
temperature is 80.degree. C., then the air can without difficulty be
accelerated by the Laval nozzle to twice the speed of sound. Then the air
temperature amounts to about -75.degree. C.

A paraphrase from patent 4,665,714

Consider an inter-cooler that bleeds off a portion of compressed air -
accelerates it thru a Laval nozzle and then pass it thru intercooler tubes.

The greater the pressure of the initial gas and the faster the nozzle, the
colder the output gas thus the intercooler will be.

Tap off the output of a turbo, pass thru heat exchanger tubes and dump into an
ejector ( pulls a nice vacuum from a pressure source ) in the exhaust gas.

Demand regulated super cooled gas generated by the turbo itself.

Finding a crap house of references on the net to nozzle including NACA which
has complete math on nozzles.

Of course, not advertised in Hot Rod and not immediately available as a bolt
on so some thimking about it applies.


Date: Mon, 08 Oct 2001 19:46:56 -0700
From: Robert Harris 
Subject: Re: fanglers-digest V1 #4252
To: fanglers@gnttype.org

Not Vortex - those are aka Hilsch Tubes.  This a basic fundamental nozzle
design.

By accelerating the gas past the speed of sound, the faster the gas goes, the
colder it gets.

Saw in patent search several people playing with it.

Basically, you can take the high pressure uncooled discharge of a turbo, run
it thru a laval nozzle to increase its speed supersonic - the faster the
colder - bleed this air thru some tubing ( think water cooled intercooler -
sept you are using superchilled air instead of water ) and then shock it back
subsonic in the exhaust - thereby drawing significant heat from the charge and
losing it in a low pressure area.

Many names you'd recognize patterned carb's that used this principle is some
of there operations.  Blended fuel and air then accelerated past sonic in
Laval nozzle and got less than 10 microns - or so they claimed.

This ponys trick is to accelerate a fluid ( gas ) past the speed of sound.

Similar to negative pressure generators used to suction power turbochargers.

Vaguely similar to steam supercharger, where a highly accelerated steam jet
out of a "nozzle" was used to "jet pump" air and steam ( water injection )
into an intake manifold.  "Boiler" was exhaust manifold - total loss system.

Could be applied to a Dragon Charger ( nickname ) - where EGR gas's are fired
into the intake of a jet pump to supercharge.  Again in patents and other
musty dusty places that didn't make it into hot rod something.

Just useless mind trivia.  Not production adapted - but check out some of the
patent assignees.