"Peter Stickney" wrote in message
om...
"J" wrote in message
. rr.com...
"Peter Stickney" wrote in message
I'm going to be simplifying a bit, for those who don't like
Thermodynamics.
I know you are trying, but don't give up your day job. :-) There are
some
problems and misconceptions with your simple explanation on how and why
it
works.

One of the dangers that comes from playing to the audience, RR.
I'd rather run the risk of over-simplicating for those who aren't
technically inclined, vs. drowning them with a firehose of Tech
Stuff. (Think of it as bait - we'll suck 'em in, get 'em hooked,
and then gaff 'em with the numbers.)

Why turn 'em off with a lot of True Stuff about Turbine Stresses,
Mass Flow, Pressure Ratios, Fuel/Air ratios, Compressor & Turbine
Efficiencies & suchlike, if it only makes their eyes glaze over?

(Oh, and as for an afterburning turbojet being considered 2 separate
engines, there have been engine installations that did just that.
The powerplant for the Republic XF-103 Mach 4 interceptor. (Cancelled
in the late '50s, but they'd cut metal for it, and the powerplant
had been tested at the N.A.C.A. tunnels and the tunnels at (I think)
Tullahoma. Basically, it was a Wright J67 (Bristol Olympus "fixed" by
Curtiss-Wright, just like they did to the Sapphire to get the J65,
with a big afterburner spaced way back in the tail. At low speeds,
it was pretty much a normal gas generator/AB combination, but as
speed picked up, and the gas generator output started decreasing,
somewhere around Mach 2, they'd divert the inlet flow around the
turbojet, shut the turbojet down, and keep going on just the AB,
using it as a ramjet.) It's just crazy enough to work.

--
Pete Stickney

Whoooooo! Don't include me in your post. I don't agree with you at all. You
are throwing a bunch of big words in there like you know what you are
talking about, which I don't think you do at all. Your statement of

"If you like, you can think of an afterburning turbojet as two engines: The
turbojet itself, and a ramjet downstream."

Is a crock. And the J-67 was a different concept. Enough said!

"PLONK"

Red Rider