Which condition is to be met for occurrence of stagnation point on a conical surface at an angle of attack with free stream? (Vθ, Vϕ are cross flow velocities)
A. Vθ + Vϕ = 1
B. Vθ + Vϕ = 0
C. Vθ2 + Vϕ2 = 0
D. (Vθ + Vϕ)2 = 1 View Answer
Answer:C
Which condition is to be met for occurrence of stagnation point on a conical surface at an angle of attack with free stream? (Vθ, Vϕ are cross flow velocities)
A. Vθ + Vϕ = 1 B. Vθ + Vϕ = 0 C. Vθ2 + Vϕ2 = 0 D. (Vθ + Vϕ)2 = 1 View Answer
Explanation: While working with three – dimensional flow over a cone kept at an angle of attack with the free stream, we look at the cross – flow plane to analyze the streamlines. The velocity on this plane is called cross – flow velocity. Stagnation point on the cone is situated where the condition Vθ2 + Vϕ2 = 0 is met.