Discussion
Match each nozzle condition in List I with what appears at the lip in List II.
List I
A. Underexpanded
B. Overexpanded
C. Perfectly expanded
D. Severely overexpanded
List II
1. Oblique shocks
2. Expansion fans
3. Neither; the plume leaves cleanly
4. A shock moving inside the nozzle, separating the flow from the wall
Select the correct match.
Answer: A
The exit pressure relative to ambient settles which case applies. Too high and the gas keeps expanding through fans; too low and shocks recompress it; matched and the plume simply leaves. Severe overexpansion drives the shock inside, and the resulting separation and side loads are a real launch hazard.
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