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采用Realizable k-ε模型,对水布垭模型水轮机进行三维全流道非定常湍流模拟,对在不同步导叶(即MGV)作用下的压力脉动进行了分析.选择活动导叶部分开度工况,分别研究MGV在3种不同开度下水轮机的压力脉动特征.分析结果表明:MGV可以减轻尾水管涡带的偏心,减小尾水管断面的压差,从而降低尾水管内低频压力脉动的振幅;MGV改变了导水机构与转轮之间原有的动静干扰特性,形成了新的振源,蜗壳和导水机构的中高频率压力脉动有所增强.
The Realizable k-ε model is used to simulate the unsteady three-dimensional turbulent flow of Shuibuya model full-channel hydraulic turbine and the pressure pulsation under the effect of unsynchronized guide vane (MGV) The results show that MGV can reduce the eccentricity of draft tube vortex belt and reduce the pressure difference of draft tube section so as to reduce the pulsation of low frequency pressure pulsation in draft tube Amplitude; MGV changed the original dynamic and static interference between the guide mechanism and the runner characteristics, forming a new vibration source, volute and guide mechanism of high-frequency pressure pulsation has been enhanced.