ブレードにスリットのあるサボニウス風車の特性

抄録

This paper is focused on the improvement of the performance of the Savonius rotor. For this purpose, the flow inside and outside the rotor is observed by means of a flow visualization method. The behavior of the vortices shed from both sides of the rotor is measured by means of hot-wire flow velocity meters. From these experimental results, it was found that the formation manners of these two vortices are different. One of the vortices is formed from the shear flow between the blade tip and the outside flow of the rotor and is directly shed into the wake. The other vortex is formed on the back surface of the advanced blade. This vortex rotates with the blade and is shed from the blade after rotating about 400 degrees. The strength of the vortex can be controlled by the slit in the blade. The optimum position of the slit is 120 degrees, at which the power coefficient is increased about 150 % as compared with the original rotor performance at u/U =1.09.