昆山市玉山圩引水泵站出水口下游河道流场模拟研究

Simulation Research on Downstream Channel Flow Field at the Water Outlet of Yushanwei Water Diversion Pump Station in Kunshan

引水泵站对改善城市水环境质量具有重要意义,但下游河床易受泵站出水口流速影响出现冲於变化。文章通过建立引水泵站下游河道模型,模拟昆山市庙泾河泵站和玉山圩涵养中心泵站出水管道的出流速度对下游河道的影响程度。结果表明:较大的出水流速会导致下游河道流速较大,增加底坎后庙泾河泵站和玉山圩涵养中心泵站底坎下游河道底层流速降低至0.2m/s和0.1m/s,底坎可起到消能和改善流态的作用,对工程建设具有借鉴意义。

Water diversion pump station plays an important role in improving the water environment quality of the city,but the downstream riverbed is easily affected by the water outlet velocity of the pump station.The influence of the outlet pipeline outflow velocity of Kunshan Miaojing River Pump Station and Yushanxu Conservation Center Pump Station on the downstream river channel is simulated in the paper by establishing the downstream channel model of the water diversion pump station.The results show that a larger outflow velocity will lead to a larger downstream channel flow rate.After the bottom sill is increased,the bottom flow rate of the bottom sill downstream channel of Kunshan Miaojing River Pump Station and Yushanxu Conservation Center Pump Station is reduced to 0.2m/s and 0.1m/s.The bottom sills can play a role in energy dissipation and flow regime improvement,which is of reference significance for engineering construction.