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A wedge of half-angle 30 degrees is placed in a stream at Mach 2. The shock will

  • A.Remain attached on the strong branch
  • B.Become a Mach wave
  • C.Detach, because 30 degrees exceeds the maximum deflection of about 23 degrees
  • D.Remain attached on the weak branch

Answer: C

The maximum deflection at Mach 2 is close to 23 degrees, so a 30 degree half-angle cannot be accommodated by any attached solution, weak or strong. A curved bow shock forms ahead of the leading edge instead, with a subsonic pocket behind its central portion.

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