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Which of these conditions result in underexpanded nozzle?

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in Aerodynamics by (773k points)
Which of these conditions result in underexpanded nozzle?

(a) Pe = Pa

(b) Pe > Pa

(c) Pe < Pa

(d) Pe << Pa

The question was asked at a job interview.

My doubt stems from Nozzles in division Quasi-One-Dimensional Flow of Aerodynamics

1 Answer

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Best answer
The correct choice is (b) Pe > Pa

The best explanation: In case of underexpanded nozzle, the exit pressure is greater than the ambient pressure Pe > Pa. This leads to formation of expansion wave at the tip of the nozzle and the flow is capable of more expansion.

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