Question

For which angle θ (between tangential pressure and freestream) does maximum coefficient of pressure exist for a blunt body?

(a) θ = 0

(b) θ = π

(c) θ = π/2

(d) θ = 2π

I have been asked this question during an online exam.

I'm obligated to ask this question of Newtonian Theory in portion Numerical Techniques for Nonlinear Supersonic Flow, Elements of Hypersonic Flow, Couette and Poiseuille Flow of Aerodynamics

Answer 1

Right answer is (c) θ = π/2

Easiest explanation: For a blunt body, the coefficient of pressure is maximum at π/2. This result is derived from Newtonian theory according to which the coefficient of pressure is related to θ by:

Cp = 2sin^2 θ

For sin π/2, which is the stagnation point, we get maximum value of coefficient of pressure.