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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。
Based on the slip-free model of mixed two-phase fluid under the assumption of uniform multiphase flow in the Euler-Euler method, a Schnerr and Sauer cavitation model considering the effects of cavitation is added. The standard k-ε turbulence model and SIMPLEC In the rotating region, a multi-reference system model was used to simulate the three-dimensional turbulent flow in a full-flow Francis turbine. By using ANSYSFLUENT, the main flow characteristics of the bubble phase in the runner and draft tube of the turbine under partial working conditions were obtained, and the location and degree of cavitation occurred in the runner of the turbine were analyzed. The results show that the proposed method can effectively predict the three-dimensional cavitation turbulent flow fields in the turbine compared with the single-phase fluid model, and can simulate the true multiphase flow in cavitations.