Abstract: The flow field in the forebay of sluice-pump station combination project is simulated via computational fluid dynamics (CFD) to investigate the influences of geometric parameters of perforated diversion pier, including pier length, orifice width, distance between the center of adjacent two orifices, and the height of the opening, on the flow pattern in the forebay. Results suggest that an appropriate length of the diversion pier could improve the flow pattern at the inlet of the pumping station. At a preferred length together with the following conditions (length of diversion pier: 8.62D (D represents the diameter of water pump impleller); orifice width: 1.55D; distance between the center of adjacent two orifices: 2.16D; height of opening: 0.66h (h stands for the water depth of the forebay)), the flow pattern in the forebay is improved better than that under other geometrical parameters, the flow velocity distribution at the inlet is more uniform, and the whirlpool combined effect function becomes lower. CFD calculation results are in agreement with model test results, hence could offer reference for selecting proper diversion pier for sluice-pump station project.

Key words: sluice-pump station combination project, flow pattern in forebay, perforated diversion pier, geometric parameters, flow rectification measures