17 Oct 2018, 16:10
Salute!
c'mon, AAAM, we call them oblique shockwaves, and that's what you get once above the mach. No problems with the oblique things interacting with other parts of the plane. In fact, some planes of the era and maybe today have "diamond" airfoils that exploit the pressure diferential of the oblique shockwaves. Spurts might chip in here.
The "normal" shockwave ( 90 deg from flight path) is found in the intake, so the air is subsonic entering the compressor section. The SR-71 Dash One ref I provided has a good section on how the intake and motor divert some of the incoming air, and that feature gave rise to many folks calling the J-58 a "turbo-ramjet". It wasn't, and our original Prat tech rep at Hill helped me a lot setting up academic sessions on the F100 engine. He had come from the J-58 shop and filled us in on that motor over a few beers.
The motor could have been a dual cycle turbo and ram if they had a bypass like most turbofans - annular, and the compression of the air might have been hot enuf for true ramjet operation using the bypass duct. Back in the day we had Bomarc drones for practice intercepts, and they ran at 3+ mach, so there may have been a way to have a combined cycle motor, but Lockheed and Pratt kept is simple(?, heh heh). Then there were temp and materials to worry about, as AAAM suggested.
Gums sends...
Gums
Viper pilot '79
"God in your guts, good men at your back, wings that stay on - and Tally Ho!"