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中文摘要：
基于欧拉–欧拉方法中均匀多相流假设的混合两相流体无滑移模型,加入考虑气穴影响的Schnerr and Sauer空化模型,采用标准k-ε湍流模型和压力速度耦合的SIMPLEC算法,转动区域应用多重参考系模型,对某混流式水轮机全流道进行了三维定常空化湍流数值模拟。利用ANSYSFLUENT,获得了该水轮机在偏工况下转轮叶道和尾水管内空泡相的主要流动特征,分析了水轮机流道内空化发生的部位与程度。计算结果表明与单相流体模型相比该方法能有效地预测水轮机内的三维空化湍流场,可以较好地模拟水轮机内真实的有空化发生的多相流动情况。
英文摘要：
The numerical simulation of three dimensional cavitation turbulent flow in Francis hydro-turbine passage was conducted based on the mixture model for homogeneous multiphase flow hypothesis in the Euler–Euler approach and the Schnerr and Sauer cavitation models.The standard k-？ model,SIMPLEC algorithm and multiple reference frame model were used.The distributions of the water-vapor volume fraction in blade passage and draft tube were obtained in special case by the software ANSYS FLUENT.The position and degree of cavition in turbine passage were analyzed.The results show that the method can be used to simulate the 3D cavitation turbulent flow and true multiphase flow with cavitation in Francis turbine than one-phase model.
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