【摘要】 采用物理模型试验方法对某城市排水泵站进水系统水力流动特性开展试验研究,发现闸门井主流偏斜使得进水箱涵两侧配水不均,进而导致前池、进水池进流不均,存在漩涡、回流等不良流态。为改善泵站进水系统水流流态,通过在闸门井内设置导流墩、在前池内设置导流墩、横梁以及消涡板构成的组合式整流措施,并对其开展物理模型试验研究。结果表明,闸门井内设置导流墩有效提高了进水箱涵配水均匀性,前池进流在受到导流墩、横梁以及消涡板的综合整流作用下,显著改善了前池和进水池的水流流态,尤其是进水池内水流在平面上分布较均匀,在立面上呈底部大、表层小的分布规律,有利于水泵抽水并可防止表面涡形成,有助于保障水泵机组的安全稳定运行。更多还原

【Abstract】 In this paper,an urban drainage pumping station is taken into the study. The inflow pattern and hydraulic flow characteristics of the water intake system are studied by the physical model experiment. It is found that the inappropriate layout of the water intake system made the oblique mainstream concentrated together in the gate shaft,and the distribution of the inlet box culverts was non-uniform. As a result,some bad flow patterns such as eddy and recirculation reflux appeared in the fore-bay and suction sump. In order to improve the bad flow pattern existing in the water intake system of the pumping station,a diversion pier was set in the gate shaft,and combined rectification measures consisting of a diversion pier,a cross beam,and an elimination vortex plate were arranged in the fore-bay. The improvement experiment results showed that the diversion pier in the gate shaft could increase the uniformity of the inlet box culverts and the fore-bay.With the help of the combined rectification measures,the flow pattern of the fore-bay and the suction sump got improved,especially in the velocity distribution in the intake suction sump. The distribution in horizon was uniform,and in vertical the velocity was large in bottom while small in top. It was beneficial for the inflow of the pumping station and prevention of the surface vertex,which could guarantee a safe stable operation of the pumping station.更多还原