Question

When does embedded shock wave appear on the cone kept at an angle?

(a) Angle of attack = half cone angle

(b) Angle of attack > half cone angle

(c) Angle of attack < half cone angle

(d) Shock wave angle = 90 degrees

I have been asked this question in semester exam.

Question is from Cones at Angle of Attack in chapter Three-Dimensional Flow of Aerodynamics

Answer 1

Correct answer is (b) Angle of attack > half cone angle

The best explanation: Embedded shock waves appear over the leeward surface of the cone when the cross – flow velocity increases thus becoming supersonic. These waves are prevalent only when the angle of attack is greater than the half – cone angle and are usually weak in nature.