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For which of thee flows is Prandtl – Glauert compressibility correction is effective?

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For which of thee flows is Prandtl – Glauert compressibility correction is effective?

(a) Subsonic flow

(b) Sonic flow

(c) Supersonic flow

(d) Hypersonic flow

The question was asked by my school teacher while I was bunking the class.

Query is from Prandtl-Glauert Compressibility in chapter Subsonic Compressible Flow over Airfoils : Linear Theory, Linearized Supersonic Flow of Aerodynamics

1 Answer

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Best answer
Correct choice is (a) Subsonic flow

The explanation: Prandtl – Glauert compressibility correction is a theory that is purely applicable for subsonic flow i.e. flow with Mach number less than 1. As the Mach number reaches 0.7, the results obtained are inaccurate.

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