Question

How does the coefficient of pressure vary for subsonic flow as the Mach number increases?

(a) Increases

(b) Decreases

(c) Remains same

(d) First increases, then decreases

This question was addressed to me during a job interview.

My question is based upon Linearized Pressure Coefficient topic in chapter Linearized and Conical Flows of Aerodynamics

Answer 1

The correct choice is (a) Increases

The explanation: The linearized coefficient of pressure for a subsonic flow varies with respect to the Mach number as follows:

Cp ∝ \(\frac {1}{\sqrt {1 – M_∞^2}}\)

According to this proportionality, as the Mach number increases, the coefficient of pressure also increases.