Discussion
All of the following fall through a Prandtl-Meyer expansion EXCEPT
Answer: C
Correct answer: The Mach number
An expansion accelerates the flow, so the Mach number rises. Everything else falls: the static pressure, temperature and density all decrease as the gas expands, and it does so isentropically, without the losses a shock imposes. That is why a Prandtl-Meyer expansion is reversible in principle while a compression through a shock is not.
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