Abstract
Darius type wind turbine with straight blades has many advantages of high performance, the wind direction independency, and easy productivity of the blade. Moreover, practical use in urban areas can be expected by the improvement of the performance because it is suitable for downsizing, and low cost due to simple mechanism. In this paper, the relationship between the fluid force of blade and flow field around blade was analyzed by using CFD method. Moreover in order to improve the wind turbine performance, the relationship between cylindrical guide mounted inside the wind turbine and chord length were examined by wind tunnel test. It was clarified that the cylindrical guide with the diameter of r_c/l_r=0.5 and chord length l_c=60〜120[mm] and number of blades N=2〜4 could increase the efficiency of the wind turbine because of improvement of flow around the blades.
