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The Prandtl-Glauert correction is applied to

  • A.Convert two-dimensional results to three dimensions
  • B.Extend incompressible results to subsonic compressible flow
  • C.Correct supersonic results for viscosity
  • D.Account for boundary-layer separation

Answer: B

The rule divides the incompressible pressure and lift coefficients by the square root of one minus the square of the free-stream Mach number, so the coefficients grow as the flow speeds up. It is a linearised correction and it fails as the critical Mach number is approached and local supersonic flow appears.

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