How starting vortex is formed?

As the airfoil begins to move vortex are formed

As the airflows on the airfoil vortex are formed

As the airflows on the circular body vortex are formed

As the airfoil moves against the relative wind vortex are formed

Correct Answer : As the airfoil begins to move vortex are formed

Explanation : As the airfoil begins to move it carries this vortex, known as the starting vortex along with it, pioneering aerodynamicists were able to photograph starting vortices in liquids to confirm their existence. The vorticity in the starting vortex is matched by the vorticity in the bound vortex in the airfoil.

Recently Updated in Aerodynamics Questions

Is laminar flow is used to increase the drag and reduce the lift?

True

False

Can Not Say

None of the above

Correct Answer : Option (A) : True

Explanation : The effect can also be exploited by devices such as aerodynamic spoilers on aircraft, which deliberately spoil the laminar flow to increase the drag and reduce the lift on the aircraft, which also used as a break to stop the aircraft

Example of turbulent flow?

Laminar flow

Flow on a symmetric airfoil

Smoking rises from cigarette

Turbulent flow on the airfoil

Correct Answer : Option (C) : Smoking rises from cigarette

Explanation : Smoke rising from a cigarette is mostly turbulent flow. However, for the first few centimeters, the flow is laminar. The smoke plume becomes turbulent as its Reynolds number increases, due to its flow velocity and the characteristic length.

Is lift is generated due to large pressure gradients on the upper side of the airfoil?

True

False

Can Not Say

None of the above

Correct Answer : Option (A) : True

Explanation : At higher angles, very large adverse pressure gradients that develop on the upper side as the airfoil attempts to generate more lift causes the boundary layer to separate, leading to a major disruption of the flow over the airfoil and the wing stalls.