Abstract: The aim of this study is to optimize the flow pattern in the forebay of sluice-pump station and eliminate the influence of unfavorable flow pattern. Causes of unfavorable flow pattern were analyzed via physical model test and numerical simulation. The effects of several optimized flow-rectifying schemes were examined, and a combinatorial rectification measure composed of diversion wall with drainage holes, Y-shaped diversion pier and diversion bucket along the flow direction was proposed. Numerical simulation verified that the diversion wall with drainage holes effectively reduced and moved upwards the backflow zone behind the diversion wall; the Y-shaped diversion pier and the diversion bucket along the flow direction helped the water flow in the forebay enter the pool uniformly and directly, hence solving the problem of flow deviation caused by transverse velocity. The proposed optimization scheme enhanced the uniformity of inlet velocity from 86.30% to 93.46%, and reduced the deviation of axial velocity from 12.63% to 3.47%. The research results implied sound effect of flow rectification.

Key words: pumping station, forebay, rectification, numerical simulation, optimization of flow pattern