Non-Linear Method for the Calculation of the Power Output of a Rotating WindTurbine

摘要

Errors observed in the prediction of the power output of a wind turbine areaddressed. A method for calculating the power output of a horizontal axis wind turbine is presented. An important part of the problem of calculating the power output of a wind turbine is to find the velocity induced at the turbine blades by its wake. An efficient method for the calculation of the velocity at the blades is described. The modeling of the wake is detailed, the calculations of wake influence coefficients are discussed and an analytic method for the far field influence of the wake is given. The resultant velocity induced at the blade and resultant blade section characteristics are calculated using a nonlinear lifting line theory. The advantages of using horseshoe vortices compared with line filament vortices is discussed. The evaluation of the power output is described.