Discussion
Assertion (A): Turning a supersonic flow round a convex corner slows it down.
Reason (R): A convex corner turns the flow away from itself.
Select the correct answer from the options below.
Answer: B
The assertion is false and the reason is true. Turning away from itself is exactly what accelerates the flow: the corner produces an expansion, so the Mach number rises while pressure, temperature and density all fall. It is a concave corner that decelerates the flow, through a shock.
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