This set of Aerodynamics Questions and Answers for Freshers focuses on “Angular Velocity, Vorticity, Strain”.
1. The rate of change of angular position of the body is called as _________
a) Angular displacement
b) Angular velocity
c) Angular acceleration
Explanation: Angular velocity comes in the picture when the flow is rotational that is the flow which has both translational as well as rotational motion. It is the rate of change of angular displacement. It is denoted by omega and its SI unit id radian per second.
2. When an element moves in a flow field it translates, it also rotates along a streamline and in addition, its shape may undergo distortion.
Explanation: An element may undergo distortion because when a body translates n rotate some of its parts me undergo external forces because of the shape of the element may change. The amount of distortion depends on the velocity field.
3. The angular velocity can be given by ______________
a) ω = 0.5(dθ1/dt + dθ2/dt)
b) ω = (dθ1/dt + dθ2/dt)
c) ω = 4(dθ1/dt + dθ2/dt)
d) ω = 8(dθ1/dt + dθ2/dt)
Explanation: Angular velocity is defined as the average of the angular velocities of the lines (2D or 3D). This is the case of 2D flow. Consider a flow, let dθ1/dt be the x component of velocity and dθ2/dt be the y component of velocity.
4. The term 2*ω is called as _____________
c) Angular velocity
Explanation: Vorticity is twice the angular velocity. The angular velocity of the fluid plays an important role in theoretical aerodynamics and 2*ω occurs frequently and in order to reduce the complexity, we use vorticity.
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