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将k-ε紊流模型与VOF方法相结合,针对长河坝水电站1号泄洪洞的掺气坎进行数值模拟研究.通过计算模拟,分析了泄洪洞掺气水流流态及掺气坎水力特性,计算得到了掺气坎坎上平均流速、水深、空腔长度、空腔负压值等.结合物理模型实测值进行对比,数值模拟结果吻合较好,说明本数值模拟是可行的.针对原工程方案中掺气坎存在回水堵塞问题,通过三维数值模拟确定了1号掺气坎高为0.9m的优化方案.本数值模型能够比较准确地模拟泄洪洞掺气坎水力特性,为类似工程掺气坎设计研究提供了可靠的依据.
The k-ε turbulence model is combined with the VOF method to simulate the aeration of the No. 1 spillway tunnel in Changheba hydropower station.According to the calculation and simulation, the aeolian flow pattern and the aerated hydraulic characteristics of the spillway tunnel are analyzed, The average flow velocity, water depth, cavity length and cavity negative pressure value were calculated and compared with the measured values of physical model.The results of numerical simulation agree well, which shows that the numerical simulation is feasible.For the former project In this scheme, there is a problem of backwater plugging in the aeration tank, and a three-dimensional numerical simulation is used to determine the optimum aeration tank height of 0.9m. The numerical model can simulate the hydraulic characteristics of the aeration tank in a flood discharge tunnel more accurately, Cigarette design provides a reliable basis for the study.