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基于三维时均N-S方程对水轮机内部流动及特性进行三维数值模拟分析,首先采用标准k-ε模型在不同导叶开度工况下对水轮机进行了全流道多部件、动静耦合的定常湍流计算,获得了各工况下各过流部件内及动静部件间的流场,并预测了水轮机的能量和空化性能。在定常湍流计算的基础上,以其作为初始条件应用RNG k-ε模型和滑移网格技术进行了水轮机动静干扰的非定常湍流数值模拟,得到了更合理的流场分布结果。该研究对于深入了解水轮机流激振动的内在机理、改善水轮机的综合性能、提高水轮发电机组的运行稳定性具有参考价值。
Based on the three-dimensional time-averaged Navier-Stokes equations, the three-dimensional numerical simulation of the internal flow and characteristics of the turbine is carried out. The standard k-ε model is used to calculate the steady turbulent flow of the full- , The flow field in each flow passage component and the static and dynamic components in each condition was obtained and the energy and cavitation performance of the turbine was predicted. Based on the steady turbulence calculation, the unsteady turbulent numerical simulation of hydro-mechanical disturbance is carried out based on the RNG k-ε model and the sliding mesh technology. The more reasonable flow field distribution results are obtained. The study is of reference value for understanding the inherent mechanism of turbine vibration and vibration, improving the overall performance of turbine and improving the operating stability of hydro-generator.