Effects of Reynolds Number and Crosswind on Aerodynamic Characteristics of S-type Vertical Axis Wind Turbine
Compared with the large wind turbine working in wild wind field,the small wind turbine is easily affected by low wind speed,high turbulence and time-varying wind speed and direction in urban wind environment.The effects of Reynolds number and inflow angle on the aerodynamic performance of small S-type vertical axis wind turbine are numerically studied.The results show that the aerodynamic performance of S-type wind turbine is not sensitive to Reynolds number,the power coefficient of which almost does not change with Reynolds number.The crosswind leads to the deterioration of the aerodynamic performance,mainly reflected in the decrease of the static torque coefficient and the power coefficient,and the higher the crosswind inflow angle is,the worse aerodynamic performance is.The flow mechanism of crosswind on the aerodynamic performance is revealed mainly in two aspects.On the one hand,the inflow angle obviously decreases the horizontal velocity component of the incoming flow.On the other hand,the vertical velocity component decreases the pressure difference of the advancing blades,while increases the pressure difference of the returning blades,thereby further decreasing the aerodynamic performance.
万方数据
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