泵站前池和开敞式进水流道的数值优化

Numerical Optimization of Pump Station Forebay and Open Inlet Conduit

基于RNG k-ε紊流模型,雷诺时均N-S方程,运用流体计算CFD软件对某泵站前池和开敞式进水流道进行三维流动数值模拟以及水力性能的优化设计。采用先局部后整体的优化方法,先对进水流道的底部坡度进行优化,再通过不断改变前池进水流道的总宽度,对泵站进水结构进行整体的优化设计。以进水结构出口断面速度均匀度和水力损失为目标函数,针对设计流量工况点做数值模拟。结果得出,优化后进水结构的水力损失由0.0035 m降低到0.0015 m,进水结构出口流速均匀度由38.62%提高到74.94%。优化后进水结构无漩涡产生,流态均匀,进水结构经优化后水力损失较小,说明数值模拟参与到前池和进水流道的优化缩短了试验周期,节约了成本,可以准确、可靠地指导工程应用,为同类泵站的设计和安全运行提供参考。

Based on the RNG k-εturbulence model and the Reynolds time-mean N-S equation,the CFD software was used to simulate the three-dimensional flow and optimize the hydraulic performance of the forepool and the open inlet conduit of a pump station.In this paper,the local and then the whole optimization method was adopted to optimize the bottom slope of the inlet conduit.Through changing the total width of the forepool of the water flow path,to overall optimization design of pumping station water intake structure and regard the inlet structure export section velocity uniformity and hydraulic loss as objective function,aiming at the design of flow operating point,the results of numerical simulation,optimized the structure of the water hydraulic loss reduced from 0.0035 m to 0.0015 m,the uniformity of flow velocity at the outlet of the inlet structure is increased from 38.62%to 74.94%.After optimization,the influent structure has no vortex and flow pattern is uniform.The hydraulic loss of the influent structure is small after optimization,which indicates that the participation of numerical simulation in the optimization of the forepool and influent flow conduit shortens the test period and saves the cost.It can accurately and reliably guide the engineering application,and provide reference for the design and safe operation of similar pumping stations.