I am wondering what will happen, if I use the laval-nozzle , which normaly accelerates a fluid the other way round:

So what happens if I fly with my aircraft at Mach 2 and I collect all the air in my convergent - divergent nozzle ? I think there will be a big shock system which slows down to the fluid.

But: Is it still valid to have at the throat Mach=1 like for a rocket laval nozzle? So I will normaly have an oblique shock right before the throat?

Thank you for your thoughts Lucas

  • 4
    $\begingroup$ It'll just choke and the shock forms right at the entrance. $\endgroup$ Dec 8, 2021 at 11:11
  • $\begingroup$ Appears unrelated to space exploration. $\endgroup$ Dec 8, 2021 at 12:55
  • $\begingroup$ @OrganicMarble might this apply to some air-breathing spacecraft like that British spacerocketplane Skylon? For comparison, Convergent-Divergent / De Laval Nozzle Dimensions was well-received and has two answers, maybe this can benefit from and answer rather than having answering blocked so quickly? $\endgroup$
    – uhoh
    Dec 9, 2021 at 0:02
  • 1
    $\begingroup$ As written, it's about an aircraft engine inlet. $\endgroup$ Dec 9, 2021 at 0:03
  • 1
    $\begingroup$ @Woody that's not a close reason. We vote to close if it's off-topic here. "Belongs on" is not our call, that belongs to moderators when deciding where to migrate. See "I’m voting to close this question because it belongs on Physics SE" is bad and here's why $\endgroup$
    – uhoh
    Dec 9, 2021 at 9:25


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