大型泵站虹吸式出水流道三维紊流数值计算

Numerical computation of the three-dimensional turbulent flow in siphon outlet conduit of large pumping stations

利用RNGκε湍流模型,闭合定常不可压雷诺时均NS方程,采用有限体积法和非结构化网格,数值模拟了设计工况下某大型泵站虹吸式出水流道的内部三维流动,并分析了流道内部流态,对驼峰断面和出口断面的速度分布特性进行了定量计算.结果表明:流道的水力损失和阻力系数分别为0.204m和3.188×10-3,驼峰断面和出口断面的速度分布均匀度分别为73.9%和65.4%,实现了流道水力特性的预测,为虹吸式出水流道水力设计优化和模型试验研究提供了参考依据.

With the finite volume method and unstructured grid, the RNG κε turbulence model is adopted to close the steady uncompressible Reynolds time-averaged NS equations, and the interior 3D flow field of a siphon outlet conduit under designed discharge is numerically simulated. On the basis of computational results, comprehensive analysis of the interior flow patterns of the siphon outlet conduit is made, the velocity distribution characteristics of siphon crest and outlet cross-sections are analyzed. The head loss and drag coefficient of the siphon outlet conduit is 0.204 m and 3188×10^(-3), respectively, and the velocity distribution coefficients of the two cross-sections mentioned above are 73.9% and 65.4%, respectively. The prediction of hydraulic characteristics of siphon outlet conduit is realized. It provides references for the optimization of the conduit hydraulic design and model test research.