水平軸風車ロータ後流の流れ場解析に関する研究

抄録

Wind farms are widely used for the wind power generation, because of the cost benefits. For the design of the farm, accurate estimations of the velocity field in the turbine wake and its effects on the downstream turbines are imperative, especially for the optimization of the wind turbine placement. The present study proposes an analysis method for horizontal axis wind turbines, which can be applied for the estimations, with relatively high accuracy and low calculation load, based on the vortex method. A wake panel emitted from the trailing edge of the blade vortex panel is replaced by a pair of orthogonal vortex elements through a virtual vortex sheet, and those vortex elements are synthesized to a discrete vortex element, which reduces the number of vortex elements, resulting in the reduced calculation load. In addition, further reduction of the elements is applied by synthesizing the vortex elements in the far wake region. The present paper explains the analysis method and shows some calculated results in order to evaluate the validity of the method.