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The second throat, or supersonic diffuser, downstream of a supersonic test section serves to

  • A.Support the model
  • B.Measure the test-section Mach number
  • C.Recompress the flow efficiently
  • D.Accelerate the flow further

Answer: C

Decelerating the stream through a series of weak shocks rather than one strong normal shock saves a great deal of stagnation pressure and therefore power. Sizing it is delicate, because the same throat must also allow the tunnel to start.

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