端板对Savonius风力机启动性能的影响

Influence of end plate on starting performance of Savonius wind turbines

为探究端板对Savonius风力机启动性能的影响,利用数值模拟和风洞试验相结合的方法对比研究了端板对两叶片、三叶片Savonius风力机在不同风速下的静态启动性能,并对流场进行了分析.结果表明:对于两叶片Savonius风力机,有端板风力机较无端板风力机平均启动力矩提升了85.4%(u=8 m/s),且反向启动力矩小,但无端板风力机启动力矩波动范围较有端板风力机小;对于三叶片Savonius风力机,有端板风力机较无端板风力机平均启动力矩提升了17.9%(u=8 m/s),但有端板风力机存在反向力矩,无端板风力机较有端板风力机整体力矩波动范围小且无反向启动力矩;端板的存在改变了叶片端部的流动情况和压力分布,叶片个数不同影响规律也不同.研究结果可以为Savonius风力机的结构设计提供参考.

In order to explore the effect of the end plate on the starting performance of Savonius wind turbines,the static starting performance of the end plate on a two-blade and a three-blade Savonius wind turbines operating at different wind speeds was compared and studied by using the method of numerical simulation and wind tunnel test,and the flow field was analyzed.The results show that for the two-blade Savonius wind turbine,the average starting torque of the wind turbine with end plate is 85.4%(u=8 m/s)higher than that of the wind turbine without end plates,and the reverse starting torque is small,but the starting torque fluctuation range of the wind turbines without end plates is smaller than that of the wind turbines with end plate.For the three-blade Savonius wind turbine,the average starting torque of the wind turbine with end plate is 17.9%(u=8 m/s)higher than that of the wind turbine without an end plate,but the wind turbines with end plates have a reverse torque,and the overall torque fluctuation range of the wind turbines without end plates is smaller than that of the wind turbines with end plates and there is no reverse starting torque.The existence of the end plate changes the flow conditions and pressure distribution at the blade end,and the influence law is diffe-rent with the number of blades.The obtained research results can provide a reference for the structural design of Savonius wind turbines.