Theoretical evaluation of axial induction factor and pressure distribution on wind turbine blades

In this paper BEM & Glauert theory of momentum are investigated for the magnitude of axial induction factor, thrust coefficients and axisymmetric pressure distribution by Kinner. The axial induction factor characteristic is analyzed around the rotor blade in order to determine the extent of velocity gradient in the flow stream relative to free stream. The influence of yaw and wake skew angles on the power coefficient of turbine is analyzed for axial induction factor variation, from tip of blades in the wake stream and when blade passes the tower. The lift and drag coefficients vary with angle of attack and tip speed ratios which enables to determine the behavior of axial and tangential induction factor observed at different blade locations. The axial induction factor is calculated also according to the azimuthal averaged positions of the turbine rotor during the operation.