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基于Realizableκ-ε湍流模型及VOF算法,采用Fluent软件模拟计算某水电站尾水隧洞不同流速下的水流流态,分析了不同流速下动能修正系数的变化规律对水头损失及其水头损失系数的影响。结果表明,隧洞内的水流流速和流向对动能修正系数值均有影响,但边界条件是影响动能修正系数的决定性因素;流速越大,水头损失越大,而水头损失系数越小,且正反不同流向的水头损失及其系数亦不相等;在急变流的条件下,动能修正系数对水头损失及水头损失系数的计算有显著影响,且流速越大,影响越大;正向流速时,动能修正系数对水头损失及其水头损失系数的计算具有加大作用,而反向流速时则具有削减作用。结果可为工程应用提供参考。
Based on Realizable κ-ε turbulence model and VOF algorithm, Fluent software was used to simulate the flow pattern of tailrace tunnel at different flow velocities. The influence of the variation of kinetic energy correction coefficient on head loss and head loss coefficient was analyzed. The results show that the velocity and direction of water flow in the tunnel all affect the coefficient of kinetic energy correction, but the boundary conditions are the decisive factors that affect the coefficient of kinetic energy correction. The larger the flow rate, the larger the head loss and the smaller the head loss coefficient, In the case of sudden flow, the correction coefficient of kinetic energy has a significant effect on the calculation of head loss and head loss coefficient, and the greater the flow rate, the greater the impact; the positive flow velocity, the kinetic energy The correction factor plays an important role in the calculation of head loss and its head loss coefficient, while it has a reduction effect in the case of reverse flow rate. The results can provide a reference for engineering application.