[AR] Re: Air breathing engines. (nothing to do with rockets)
- From: Norman Yarvin <yarvin@xxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Mon, 11 Oct 2021 17:37:56 -0400
On Mon, Oct 11, 2021 at 03:03:56PM -0400, Doug Jones wrote:
NASA SP-194 LIQUID PROPELLANT ROCKET COMBUSTION INSTABILITY, particularly
section 7.2.5. If you populate the entire injector face with elements,
you're gonna have a bad time. But it's what everyone seems to have done
ever since the F-1, and none of them ever read the goddamn book. It's
cringeworthy.
How far did you take it? I mean, on one level you can look at that
section and say "okay, injectors just in region B worked for them, and
so that's what I'm going with. Hmm, where exactly is region B? They
don't define it precisely, but eyeballing it is probably good enough."
Or on another level you could read it as saying you should look into
the "theoretical and experimental studies" that "are available for
indicating the sensitive injector areas", and go, well, as far down
the rabbit hole of numerical modeling as you'd like.
(Whatever you did, the XCOR engines did end up with extraordinarily
smooth combustion. The videos were most impressive: those shock
diamonds scarcely budged.)
Other related posts: