Numerical Simulation of 3D Cavitating Turbulent Flow in Francis Turbine
Numerical Simulation of 3D Cavitating Turbulent Flow in Francis Turbine
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DOI：
10.1115/fedsm2005-77017
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
Shuhong Liu;Yulin Wu;Xianwu Luo
中科院分区：
文献类型：
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作者：
Shuhong Liu;Yulin Wu;Xianwu Luo
通常，当弗朗西斯涡轮机福尔斯中的液体局部压力下降到饱和蒸汽压力以下时，很容易发生气穴现象。它的一些问题会对水电站造成严重的危害，已成为水力机械领域的主要问题之一。本文采用FLUENT 6.1商用软件，对一台原型弗朗西斯涡轮机进行了全流道汽蚀的定常数值模拟，其中多相流采用混合模型，汽蚀采用全汽蚀模型。在几种工况下进行了数值模拟，得到了每种工况下的内流条件和临界空化数。计算结果表明，空化流动对转轮前过流部件内部流动状况没有影响。转轮和尾水管内空化流动的发展趋势与涡轮机的经验结果吻合较好，并定量预测了临界空化数。
Generally, cavitation occurs very easily when liquid local pressure in the Francis turbine falls below the saturated vapor pressure. It will injure the hydropower plant seriously by some problems, and has become one of the main concerns in the field of hydraulic machinery. In this paper, we present steady simulation on cavitation performed through the whole passage of a prototype Francis turbine with mixture model for multiphase flow, and full cavitation model for cavitation effect, from the commercial code of FLUENT 6.1. The simulation is conducted at several operating conditions, and the internal flow conditions and the critical cavitation number were obtained for each case. The simulation results indicate that the internal flow condition in the flow parts before the runner is not affected by the cavitating flow. The tendency of the cavitating flow in the runner and draft tube agrees well with the turbine empirical results, and the critical cavitation number has been quantitatively predicted.© 2005 ASME