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中文摘要：
本文通过理论分析，引入三维混合流体完整空化湍流模型，确定了混流式水轮机内部三维空化湍流计算的方法。用数值模拟手段对混流式水轮机的内部空化流场进行了计算，采用了全三维全流道的湍流计算方法，基于RNG的κ-ε湍流模型和SIMPLEC算法，从蜗壳进口到尾水管出口，包含所有流道在内的整体一次完成定常。根据得到的三维空化流场数据，对转轮内部流场进行了流场分析，求得了计算临界空化系数，和试验值进行了比较;模拟了特征工况下的尾水管涡带，和试验数据进行了比较。
英文摘要：
For simulating 3D cavitation flow in Francis model turbine, 3D mixture full cavitation model which describes an homogeneous multiphase flow is adopted. Water vapour phase and water phase are considered to be at balance of dynamics and diffuseness, and most of the physics processes during cavitation are considered. Based on RNG k - ε turbulence model and SIMPLEC arithmetic, the whole passage of model turbine is computed with steady simulations. According to simulation results, cavitation flow field is analyzed, and critical cavitation coefficient is gotten. And character of cavitation vortex is also work out in draft tube. The conclusion can be drawn that 3D mixture full cavitation model can be used to simulate cavitation flow in a hydro Francis turbine.
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