大型进水流道进口优化布置的数值模拟研究  

Numerical simulation for optimization of the inlet conduit of large-capacity power plant

作　　者：孙东坡[1] 张晓雷[1] 张艳艳[2] 王二平[1] 王鹏涛[1] 

机构地区：[1]华北水利水电学院水力学及河流研究所,郑州450011 [2]清华大学水利水电工程系,北京100084

出　　处：《水力发电学报》2011年第5期80-85,100,共7页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金(50779019)

摘　　要：针对1000MW大型电厂进水流道工程实际,应用k-ε紊流模型对集水池及进水流道口附近流场进行了平面二维水流数值模拟计算,并利用物理模型进行了验证。通过流场分析,提出了紧凑短流道的优化平面布置,改善了引水段导墙与人字柱支墩的形式。模拟成果表明:优化方案调整了流道进口流态,保证了各流道的进流均匀、水流稳定。针对非正常低水位运行时的进流不均匀状况,利用动静压差,设置旁侧斜向补流孔,有效的调整、提高了内侧流道进流条件。A two-dimensional k-ε turbulent model was used to simulate the flows in the cooling pool and the inlet channel of a large power plant of 1000 MW,and it was verified with scale model test data.By analysis of simulation data,an optimal design scheme of compact short-inlet conduit was obtained through improvement on the shapes of flow-guiding wall and V-shape piers.Simulation results indicated that the optimal scheme can adjust stream pattern near the conduit inlet and ensure the flow＇s uniformity and stability.To reduce the non-uniform inflow under abnormal low-head operation,the optimal scheme adopts lateral oblique holes allowing supplementary inflow driven by the difference of dynamic and hydrostatic pressures,which is an effective measure in adjusting and improving the inflow condition of inner conduit.

关 键 词：水力学 数值模拟 优化布置 k-ε模型 进水流道 补流孔 

分 类 号：TV132[水利工程—水力学及河流动力学]