Abstract
Flow around the vertical axis wind turbine in the blow-off type wind tunnel was simulated numerically by 3-D LES (Large Eddy Simulation) analysis. The effect of the blockage to the running performance of Savonius-type wind turbine was tested. Nozzle of the wind tunnel is square section, and its side is 3.97 times of rotor diameter. Distance of rotor to nozzle is 4.1 times of rotor diameter. Furthermore numerical simulation was done to the rotor in open space condition. Numerical method is structured by finite volume method which involving composite grid. As a result of analysis, maximum output coefficient in the blow-off wind tunnel was 15% lower than that in open space. Furthermore figures of flow fields showed that the drop of output coefficient was caused by velocity drop.
