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A shock tunnel is used for hypersonic testing because it

  • A.Operates only below Mach one
  • B.Very high stagnation enthalpy, briefly
  • C.Runs continuously at low cost
  • D.Avoids the need for any nozzle

Answer: B

Reproducing hypersonic flight means reproducing the enormous stagnation temperature, and no continuous facility can supply it affordably. A shock tunnel uses a reflected shock to heat the gas violently for a few milliseconds, which is long enough for the flow to establish and be measured.

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