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The flow downstream of an oblique shock is deflected

  • A.Away from the shock
  • B.Not at all
  • C.Perpendicular to the shock
  • D.Towards the shock, that is turned into itself

Answer: D

Because the normal component drops while the tangential component is preserved, the resultant downstream velocity lies closer to the shock surface than the upstream one did. The flow is therefore turned into itself, which is exactly what happens when supersonic flow meets a compression corner or a wedge.

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