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An expansion fan reaching a constant-pressure free boundary, such as a jet edge, reflects as

  • A.Another expansion
  • B.A slip line
  • C.Nothing; it passes straight through
  • D.A compression

Answer: D

The boundary can support no pressure difference, so the pressure drop the incident expansion would cause must be cancelled. The reflected wave is therefore a compression. This alternation of expansions and compressions reflecting off the plume edge is what produces the shock diamond pattern in a rocket exhaust.

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