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When an oblique shock strikes a plane solid wall, it

  • A.Reflects as a normal shock
  • B.Reflects as another oblique shock, so the flow leaves parallel to the wall
  • C.Reflects as an expansion fan
  • D.Is absorbed entirely by the wall

Answer: B

The wall imposes flow tangency, so the deflection produced by the incident shock must be cancelled. A reflected shock of the opposite deflection does exactly that. The reflection is not mirror-symmetric in angle, because the reflected shock acts on a slower stream than the incident one did.

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