Question

Linearized theory is applicable for transonic regions as well.

(a) True

(b) False

I got this question during an online interview.

I would like to ask this question from Linearized Subsonic Flow topic in chapter Linearized and Conical Flows of Aerodynamics

Answer 1

The correct answer is (b) False

For explanation: According to the Prandtl – Glauert rule, as the limit of Mach number is increased to one, the aerodynamic forces – lift and drag becomes infinity which is practically impossible. Thus, this rule is only applicable for subsonic and supersonic regimes.

Cl = \(\frac {C_{l0}}{\sqrt {1 – M_∞^{2}}}\), Cd = \(\frac {C_{d0}}{\sqrt {1 – M_∞^{2}}}\)