Discussion
A convergent-divergent nozzle always improves performance. Is this correct?
Answer: A
Correct answer: No, below critical it decelerates
A divergent passage accelerates supersonic flow but decelerates subsonic flow. Below the critical pressure ratio the throat never goes sonic, so the divergent section acts as a diffuser, trading velocity back for pressure and reducing the thrust below what a simple convergent nozzle would give. The extra weight is a secondary objection; the aerodynamic one is decisive, and it is why convergent-divergent nozzles appear only on supersonic and rocket applications.
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