On optimization of power coefficient of HAWT

       The 6th Asia-Pacific Power and Energy Engineering Conference (APPEEC 2014)——The horizontal axis wind turbine (HAWT) blades rotation in the steady wind flow is considered. We discuss the prob-lem of determining the blade twist which could guarantee the maximum value of the power coefficient. We define the blade twist as the technological turn of sections of blade around its axis. This turn changes the effective pitch angle of turbine blade along its length. For description of aerodynamic load upon the blades we used the quasi-steady approach. Air velocities of centers of pressure of blade sections are represented with taking into account components induced by flow and vortex. We reduced the functional maximization problem to finding the maximum of non-dimensional function. This function is given by Riemann integral depending on section pitch angle and tip speed ratio. We suggested the algorithm for solving the problem under consideration for a given blade shape.