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The downstream flow behind a weak oblique shock is

  • A.Always faster than the upstream flow
  • B.Usually still supersonic
  • C.Always subsonic
  • D.Always exactly sonic

Answer: B

The weak solution reduces the normal component below sonic speed but leaves the tangential component untouched, so the resultant is generally still supersonic. That is why a supersonic aircraft can carry a series of oblique shocks without the flow ever going subsonic until the designer intends it to.

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