Question

In which direction does the streamline move downstream the shockwave in a hypersonic flow over a wedge?

(a) Straight line

(b) Parallel to the surface

(c) No fixed direction

(d) Perpendicular to the surface

The question was posed to me during an interview.

My query is from Newtonian Theory topic in portion Numerical Techniques for Nonlinear Supersonic Flow, Elements of Hypersonic Flow, Couette and Poiseuille Flow of Aerodynamics

Answer 1

Correct option is (b) Parallel to the surface

The best I can explain: In a hypersonic flow, there is a formation of a thin shock layer over a wedge surface. The streamline pattern follows the trend such as upstream of the shock wave, the flow moves in a straight – line. On moving downstream of the shock wave, the flow is parallel to the wedge – surface inclined at the wedge – angle.