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 university, it has been reported that the performance can improve using cylindrical guide inside the wind turbine, but the mechanism has not been clarified. In this paper, the relationship between the fluid force of blade and flow field around blade when use the guide or not was analyzed by using CFD method. It was clarified that the flow around the blades of the wind turbine on condition that chord length l_c= 80[mm] and number of blades N= 3 eased by using the cylindrical guide with the diameter of r_c/l_r=0.45 in the range of angle of rotation θ=0〜90[deg].
