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The sonic line on a blunt body with a detached bow shock is where

  • A.The stagnation streamline meets the shock
  • B.The boundary layer first separates
  • C.The flow, having gone subsonic behind the shock, re-accelerates back to Mach one
  • D.The bow shock first touches the body

Answer: C

Immediately behind the nearly normal portion of the bow shock the flow is subsonic. As it expands round the shoulder of the body it accelerates again, and the locus where it passes back through Mach one is the sonic line. Downstream of it the flow is supersonic once more.

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