中文摘要：

为了研究水泵水轮机偏工况下的导叶内部的压力脉动特征,本文比较分析了非定常雷诺平均模拟方法URANS和脱体涡模拟方法DES两种方法预测压力脉动特征的可行性,结果表明,DES可以用来预测压力脉动特征,最后,重点对泵工况Q/QD=0.15工况点的压力脉动的时域和频域特征进行了分析,得到固定导叶和活动导叶内部的压力脉动主要是低频成分,为转轮通过频率的11.27%。此外,固定导叶内部的压力脉动没有受到转轮内部的影响,而活动导叶内部则含有转轮通过频率成分。

英文摘要：

In order to investigate the pressure fluctuation characteristics in the guide vanes and stay vanes of pump turbine under off-design conditions,unsteady renolds averaged Navier-Stokes simulation（URANS）detached eddy simulation（DES）were carried out.The results showed that the DES method can be used to capture the pressure fluctuation characteristics.And then,the pressure signals under the operating condition Q/Q_D=0.15 were analyzed in the time domain and frequency domain respectively.The results suggested that low frequency pressure fluctuations（f/9f_n=11.27%） are remarkable and the pressure signal in the stay vanes is not affected by the runner while that in guide vanes is influenced obviously.