What happens when the cross – flow velocity becomes supersonic?

Correct Answer : Option (B) :   2

Explanation : For axisymmetric flow (flow over a cone at zero angle of attack), the flow field is only dependent on polar angle whereas when the cone is kept at some angle of attack, the flow field is a function of both polar angle θ and the azimuth angle φ.

Correct Answer : Option (C) :   Three – dimensional

Explanation : When the right – circular cone is kept at a zero angle of attack to the free – stream, it is known to be axisymmetric and is known to be a two – dimensional flow. But, when it is kept at an angle of attack, the flow no longer remains two – dimensional. The shock wave more or less remains the same but the flow becomes three – dimensional.

Correct Answer : Option (D) :   Polar angle

Explanation : When a right – circular cone is kept at a zero angle of attack in a supersonic flow, the flow properties are only a function of polar angle θ. It is independent of the azimuth angle φ and the distance from the vertex along conical ray.