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In incompressible flow, the pressure coefficient at a stagnation point equals

  • A.One
  • B.Zero
  • C.Minus one
  • D.Infinity

Answer: A

At stagnation the local pressure exceeds free-stream static by exactly the dynamic pressure, so the ratio is one. It is the maximum value the coefficient can reach in incompressible flow, whereas negative values over the upper surface may be large.

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