For a simple harmonically varying free stream problem obtain the expression for sectional moment coefficient about the midchord in terms of the reduced frequency for the amplitude. Plot the graph for the moment coefficient using the data of Problem 3.15.

Problem 3.15

Consider the simple harmonically varying free stream problem for the reduced values \(k=0.2,0.4,0.6\) and  \(0.8\), find the lift coefficient under constant angle of attack. Take the amplitude change as \(\lambda=0.4\) and obtain the graph for the ratio of the unsteady lift coefficient to quasi steady lift coefficient for each reduced frequency values. Comment on the peaks of the lift curves.

Fig. 3.16 

Gust intensity

Transcribed Image Text:

Wg 0 to t