(at 2:32...) Wait a minute... if a shock wave can travel through a gaseous medium at "faster than the speed of sound" (2:14). then can shock waves travel upstream through the choked flow in the throat of a De Laval nozzle? And if so, doesn't that seriously undermine the premise that "downstream state information can not flow upstream faster than the speed of sound, so the flow characteristics of a C-D nozzle in choked flow are determined solely by upstream conditions"? OK.. I get it that the shock wave wouldn't carry information about the "unshocked" downstream state, only about itself - and that these would be highly random, disordered, chaotic conditions. And I'll bet that a later module here (maybe later in this module), you'll explain how shockwaves can be disruptive, possibly even destructive phenomena if they occur within C-D nozzles or scramjets. I'll just sit back and watch for that... Still, it's a bit puzzling to think of a "sound" travelling faster than sound....
Australia is internationally recognized as a leader in hypersonic research, especially on the experimental side. Thanks for the video!
I m here after the Beirut blast
Beruit brought me here
Beirut blast got me here.
Great videos sir. Detailed and simplified description of the complicated things.
Thanks professor.. Great explanation
Good work. Thank you
Yes thank you.
best explanation ever seen
thank you
good graphics :D
(at 2:32...) Wait a minute... if a shock wave can travel through a gaseous medium at "faster than the speed of sound" (2:14). then can shock waves travel upstream through the choked flow in the throat of a De Laval nozzle? And if so, doesn't that seriously undermine the premise that "downstream state information can not flow upstream faster than the speed of sound, so the flow characteristics of a C-D nozzle in choked flow are determined solely by upstream conditions"?
OK.. I get it that the shock wave wouldn't carry information about the "unshocked" downstream state, only about itself - and that these would be highly random, disordered, chaotic conditions. And I'll bet that a later module here (maybe later in this module), you'll explain how shockwaves can be disruptive, possibly even destructive phenomena if they occur within C-D nozzles or scramjets. I'll just sit back and watch for that...
Still, it's a bit puzzling to think of a "sound" travelling faster than sound....