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A supersonic wind tunnel requires which feature that a subsonic one does not?

  • A.A model support
  • B.A convergent-divergent nozzle
  • C.A settling chamber
  • D.A drive fan

Answer: B

Reaching supersonic speed demands a throat followed by a divergent section, with the area ratio setting the test-section Mach number. A well-designed contour, usually produced by the method of characteristics, leaves uniform parallel flow at the model.

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