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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。
In order to study the characteristics of pressure pulsation inside the guide vane under partial conditions of pump turbine, this paper comparatively analyzed the feasibility of unsteady Reynolds-averaged simulation method URANS and stripping eddy simulation method DES to predict the characteristics of pressure pulsation. The results show that DES It can be used to predict the characteristics of pressure pulsation. Finally, the time-frequency and frequency-frequency characteristics of pressure pulsations at pump operating conditions of Q / QD = 0.15 are mainly analyzed. The pressure pulsations inside the fixed vanes and movable guide vanes are mainly Is a low-frequency component that is 11.27% of the runner’s pass frequency. In addition, the pressure inside the fixed guide vane pulsation was not affected by the interior of the runner, while the movable guide vane contains the wheel through the frequency components.