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Across an oblique shock, the stagnation temperature

  • A.Falls in proportion to the shock angle
  • B.Rises in proportion to the shock angle
  • C.Falls to zero
  • D.Is unchanged, as it is across a normal shock

Answer: D

An oblique shock is adiabatic just as a normal shock is, so the stagnation temperature comes through it unchanged. Stagnation pressure is the quantity that suffers, and it falls less for an oblique shock than for a normal shock at the same upstream Mach number, which is the whole basis of external-compression intake design.

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