FULL-POTENTIAL CIRCULAR WAKE SOLUTION OF A TWISTED ROTOR BLADE IN HOVER

An exact solution to the flow past a rotor blade is quite difficult because of the nonuniform, complicated flow in its vicinity. A few approximate solutions, employing both transonic small disturbance and full-potential aerodynamic theories with prescribed wakes, have been obtained in the past. This note uses a modified version of the full-potential code ROT22 and presents, employing a simple, circular wake, a solution for the transonic flow past a twisted rotor blade in hover. The flow is also evaluated for a fixed-wing-type straight wake, and the results of the two calculations are compared. The results of the circular wake solution are also compared with those for a cambered section obtained on the basis of a general two-dimensional wake. It is shown that the circular wake and the general two-dimensional wake solutions have similar characteristics.