Discussion
Match each nozzle back-pressure condition in List I with the resulting flow in List II.
List I
A. Back pressure equal to the design value
B. Back pressure slightly above the design value
C. Back pressure just below the choking value
D. Back pressure above the choking value
List II
1. Fully supersonic exit, no shock in the nozzle
2. Normal shock standing in the divergent section
3. Subsonic flow throughout, throat just sonic
4. Subsonic flow throughout, throat not sonic
Select the correct match.
Answer: D
Lowering the back pressure takes the nozzle through a well-defined sequence: subsonic throughout, then just choked, then a shock appearing at the throat and moving downstream, and finally the design condition with the shock swept out of the exit. Below that come the underexpanded cases with expansion fans outside.
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