Water Injection for power?

[Mark Pitts]

Hey guys... did ya know that hover time of the Harrier Jump Jet (AV8b ?) =
is limited by water, as needs to inject water to get the density up =
enough to produce enough thrust to hover (remember that this engine has =
no afterburners or anything.

Just kinda interesting... wonder what their fuel injection system does =
in the flame tubes? They must need to richen/lean out the flame (when =
spinning up and down on shaft RPM)=20

Completely off track, and thinking out loud. Sorry! ;-)


Mark



----------
From:  Dave Williams[SMTP:dave.williams at chaos.lrk.ar.us]
Sent:  Monday, September 09, 1996 7:59 AM
To:  diy_efi at coulomb.eng.ohio-state.edu
Subject:  Water Injection for power?


-> article that may be of interest.  The author suggested that, instead
-> of the usual fan/radiator/et al, the cylinders be cooled by injecting
-> water (diesel style) during the latter part of the power stroke.  The
-> H2O would flash into steam, thereby changing the heat (normally
-> exhasted) into mechanical power.

 Direct-to-cylinder cooling has been used on some large Diesels.  Worked
okay, as far as I know.

 "Six stroke" engines have also been built, with water injected after
the exhaust stroke.  The water flashes to steam, provides a little extra
kick, and cools the cylinder.

 Either scheme requires a large supply of water, approximately as much
by volume as the fuel supply, making such things awkward for motor
vehicles, though it's no big deal in stationary installations.
                        =20