采用SST k-ω湍流模型对某高水头水泵水轮机进行全流道三维非定常数值模拟，分别对在水轮机工况和水泵工况运行下的导叶动态力矩特性进行分析。结果表明：在水轮机工况下，随着流量的增大，不同位置处导叶的动态水力矩变化规律一致，力矩值由正值变为负值，力矩脉动频率与转轮叶片数相关，流量越大，叶频影响越显著；在水泵工况下，最高扬程工况时导叶水力矩脉动频率主频为转频且脉动幅值较大，而最低扬程工况下导叶水力矩脉动主频为叶频，力矩脉动幅值较小。

Threedimensional unsteady flows in the full passage of pumpturbine have been simulated using SST k-ω turbulence model,and the dynamic torque characteristics of guide vanes under turbine and pump modes are analyzed.The results show that under the condition of hydraulic turbine,the variation law of hydraulic torque of guide vane at different positions is consistent.With the increase of flow rate,the torque value changes from positive to negative.The frequency of torque ripple is related to the number of runner blades.The larger the flow rate,the more significant the influence of blade frequency is.In the pump operating conditions,the main frequency of torque pulsation is rotating frequency and its amplitude is larger in the highhead operation,while the main frequency is blade frequency in the lowhead operation,and the amplitude is smaller.

TK734

四川省科技计划项目(2017GZ0053，2017JY0047，2017NZ0031)