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The lambda foot seen at the base of a transonic shock is produced by

  • A.Interaction between the shock and the boundary layer beneath it
  • B.Reflection of the shock from the far wall of the tunnel
  • C.The shock splitting into two Mach waves
  • D.Condensation of moisture in the flow

Answer: A

Near the wall the boundary layer is subsonic, so it transmits pressure information upstream and the compression begins ahead of the main front. The result is an oblique leading branch meeting the near-normal shock above it, giving the characteristic lambda shape visible in schlieren photographs.

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