What does the Prandtl – Glauert rule relate?(a) Shape of airfoil in transformed spaces(b) Incompressible flow to the compressible flow for same airfoil(c) Coefficient of lift to coefficient of pressure(d) Coefficient of drag to coefficient of pressureI have been asked this question by my college professor while I was bunking the class.Question is from Linearized Subsonic Flow topic in section Linearized and Conical Flows of Aerodynamics

What does the Prandtl – Glauert rule relate?(a) Shape of airfoil in

1.	What does the Prandtl – Glauert rule relate?(a) Shape of airfoil in transformed spaces(b) Incompressible flow to the compressible flow for same airfoil(c) Coefficient of lift to coefficient of pressure(d) Coefficient of drag to coefficient of pressureI have been asked this question by my college professor while I was bunking the class.Question is from Linearized Subsonic Flow topic in section Linearized and Conical Flows of Aerodynamics
Answer» Right choice is (b) Incompressible FLOW to the compressible flow for same airfoil The explanation: The Prandtl – Glauert equation is given by: Cp = \(\frac {C_{p0}}{\sqrt {1 – M_∞^{2}}}\), Cl = \(\frac {C_{L0}}{\sqrt {1 – M_∞^{2}}}\), CD = \(\frac {C_{d0}}{\sqrt {1 – M_∞^{2}}}\) This equation relates the pressure/lift/drag coefficient in incompressible flow Cp0 to the pressure/lift/drag coefficient in compressible flow (Cp) for a two – dimensional airfoil with the same profile.

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