On Wed, 31 Jul 2002, David Weinshenker wrote:
> aren't they just spraying fuel from a single jet across the exit
> of the catpack? This injection _technique_ may well require
> refinement as the engine size increases... most large engines use
> lots of little holes to inject liquid propellants...
That's largely because they're injecting liquid against liquid, rather
than injecting a liquid into a fast-moving gas stream. Injecting into a
fast gas stream does *wonders* for atomization efficiency.
I know of one set of liquid-into-fast-gas tests (not with peroxide) which
explored various from-the-side injector arrangements and concluded that
the one-big-hole approach actually worked *best*. The key variable, at
least in their setup, was liquid penetration into the gas stream: better
penetration gave better mixing, and a bunch of little liquid jets didn't
penetrate their very hot, very fast gas stream nearly as well as one big
one.
Henry Spencer
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