Obtain the time dependent lift coefficient for an elliptic thin wing in a variable free stream. For a wing with an aspect ratio of 6 obtain the unsteady to quasi steady lift ratio for the Example 3.5. Plot the result.

Example 3.5

A rotating blade in a forward flight is modeled at its section with a sinusoidally varying free stream speed under constant angle of attack. Obtain the unsteady variation of the sectional lift coefficient in terms of the quasi steady lift coefficient and plot its variation by time for different intensities of the changing sinus term.