Discussion
Match each duct condition in List I with its effect on the flow in List II.
List I
A. Converging duct, subsonic flow
B. Diverging duct, subsonic flow
C. Converging duct, supersonic flow
D. Diverging duct, supersonic flow
List II
1. Flow decelerates
2. Flow accelerates
3. Flow accelerates and pressure falls
4. Flow decelerates and pressure rises
Select the correct match.
Answer: A
The area-velocity relation reverses at Mach one. Below it a duct behaves as intuition suggests, squeezing to accelerate. Above it the roles swap, so a converging duct decelerates supersonic flow while a diverging one accelerates it. That inversion is the whole reason a supersonic nozzle has a throat.
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