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In a shock tube, the diaphragm burst sends into the low-pressure gas

  • A.An expansion fan, while a shock travels into the high-pressure gas
  • B.Shock waves in both directions
  • C.Expansion fans in both directions
  • D.A shock wave, while an expansion fan travels into the high-pressure gas

Answer: D

The pressure difference drives a shock into the low-pressure driven gas, compressing and heating it, while a centred expansion fan runs back into the high-pressure driver gas. The region between them is the uniform test gas, and it is what makes the shock tube such a useful short-duration facility.

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