The flow generated by a helicopter rotor can be approximated

The flow generated by a helicopter rotor can be approximated as a free vortex of strength Gamma. The helicopter experiences a wind of with a relative speed of U as shown below. (a) What is the velocity potential for the air flow around the helicopter? (b) With the origin centred on the helicopter, obtain expressions for the components upsilon_r and upsilon_q of the velocity field. (c) Determine the location of the stagnation point.

Solution

Dynamics - Vibration - natural frequencies and mode shapes