非对称入流工况下钟形进水流道数值模拟试验研究

Numerical Simulation and Experimental Study on Bell-Shaped Suction Box Under Non-Symmetric Inflow Conditions

结合南水北调某大型泵站钟形进水流道的设计,采用雷诺平均纳维-斯托克斯方程(RANS)和标准湍流模型,运用SIMPLEC算法,模拟了钟形进水流道2种设计方案在对称进水工况和偏流进水工况下的三维流场。结果表明:原设计方案在偏流进水工况下流道中易产生旋涡,而加设隔板后流道中则无旋涡产生。用泵装置模型试验对计算结果进行了验证,试验结果表明,加设隔板方案的泵装置性能较原设计方案的泵装置性能有了较大的提高,装置最高效率提高可达15%。说明在进行大型泵站钟形进水流道的优化设计时,应充分考虑到偏流进水对流态的影响。

The 3D-flow field in a bell-shaped suction box of a large pumping station of the South-to-North Water Transfer Project is simulated applying Reynolds-averaged Navier-Stokes （RANS） equation, the standard turbulent model, and SIMPLEC algorithm. The simulations are conducted for suction boxes under symmetrical and unsymmetrical inlet conditions of two different designs. A general conclusion is that, there is vortex in the bell-shaped suction box under unsymmetrical inlet conditions of original design, but the vortex does not exist when the clapboard is added in the bell-shaped suction box under the same inlet conditions. The pumping set model test confirms the simulation that the pumping set performance is improved markedly after adding clapboard compared in the suction box. The best efficiency of pumping set is increased by 15%. Hence, for the optimization design of bell-shaped suction box, more attentions should be paid to the effect of unsyrmnetrical inlet conditions on pump hydraulic performance.