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Compared with a normal shock at the same upstream Mach number, an oblique shock produces

  • A.A larger pressure rise and a larger loss
  • B.A smaller pressure rise and a smaller stagnation pressure loss
  • C.A larger pressure rise and a smaller stagnation pressure loss
  • D.The same pressure rise but a larger loss

Answer: B

Only the normal component drives the shock, and it is smaller than the full velocity, so the shock is weaker in every respect: less compression, less heating and less entropy generated. Getting a required compression therefore costs less if it is done obliquely and in stages.

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