Numerical simulation and experimental verification of forward feed array diaphragm rectifier for multi-unit pumping station
ZHANG Xiaowen1, LIU Chao1*, RONG Yingchun2, FENG Xusong2, FU Tishan3, SUN Yumin4
1. College of Hydranlic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China; 2. Jiangsu Water Source Company Ltd. of the Eastern Route of the South-to-North Water Diversion Project, Nanjing, Jiangsu 210000, China; 3. Shandong Trunk Line Co. Ltd., The Eastern Route of the South-to-North Water Diversion Project, Jinan, Shandong 250000, China; 4. Water Resources Department of Shandong Province, Jinan, Shandong 250000, China
Abstract：Aiming at the problem of bad flow patterns in the forebay of forward-flow pumping station with multi-units, the flow field in the forebay of pumping station under different start-up conditions was studied by CFD and model test, a method of using array diaphragm as rectifier was put forward, and the effect of array diaphragm as rectifier was evaluated. The results show that there is a large area of circumfluence and vortex in the forebay under three different start-up conditions. The velocity uniformity at the outlet of the forebay is 38.42%-57.39%, and the condition of water inlet of the pump is poor. In order to improve the bad flow pattern in the forebay of forward intake pump station, an array baffle is used to rectify the flow pattern. After adopting the array baffle, the backflow and vortex area in the forebay are reduced and transferred, and the extrusion of the backflow and vortex area to the main stream is obviously weakened. The velocity uniformity at the outlet section of the forebay is increased to 47.23%-63.17%, the water inlet condition of the pump is improved remarkably. The experimental results are in good agreement with the numerical results, and the numerical simulation is verified by the experiment. The research results can provide a reference for the construction and operation of multi-unit forward intake pumping station.
