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Compared with a normal shock, an isentropic compression achieving the same pressure rise leaves the gas

  • A.Cooler, and with its stagnation pressure intact
  • B.Hotter, and with its stagnation pressure intact
  • C.Cooler, but with a large stagnation pressure loss
  • D.At exactly the same state

Answer: A

The shock dissipates energy, so it reaches a hotter, higher-entropy state for the same pressure rise and destroys stagnation pressure doing it. An isentropic compression achieves the same pressure more efficiently, which is why intake designers approach it as closely as they can with a series of weak waves.

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