Discussion
A flow at \( M = 1 \) is turned through \( 26.38 \) degrees round a convex corner. The Mach number it reaches is
Answer: C
The Prandtl-Meyer function is zero at Mach one, so the downstream value is simply the turning angle itself, \( 26.38 \) degrees, which corresponds to Mach 2. This is the cleanest illustration of what the function means: it measures turning accumulated from sonic conditions.
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