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For a fixed wedge angle, raising the upstream Mach number causes the attached oblique shock to

  • A.Lie closer to the wedge surface
  • B.Lie further from the wedge surface
  • C.Detach immediately
  • D.Become a normal shock

Answer: A

Higher Mach number means a smaller Mach angle and, on the weak branch, a smaller shock angle for the same deflection, so the shock wraps in closer to the surface. At hypersonic speeds the shock lies very close indeed, producing the thin shock layer characteristic of that regime.

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