Forebay sedimentation is a common problem in large pump stations because the water is taken in from heavily silt-carrying rivers. Targeting the #3 Pump Station of West Trunk Line (Phase I), Gansu Jingtaichuan Irrigation District, the author learned about the current situation of forebay sedimentation through site investigation, and constructed a 3D structural model of prototype forebay based on ICEM-CFD. Furthermore, the flow pattern of the straight-edge front inflow (SEIF) forebay was simulated based on FLUENT. Then, two anti-silt measures, i.e. diversion pier and pressure plate, were put forward to improve the flow pattern of the forebay. The results show that the simulation results on forebay flow pattern agree well with the data acquired through site investigation; the trapezoid diversion pier reduced the range of the main reflux zone to some extent by distributing the forebay flow, failing to obviously improve the distribution of the flow field; the 45° pressure plate exhibited obvious optimization effect, reducing the range and intensity of reflux zone on both sides of the forebay.
forebay of pump station, silt accumulation, numerical simulation, trapezoid diversion pier, 45° pressure plate
This work was supported by the National Natural Science Foundation of China [grant numbers 51579102, 31360204], the Support Plan of Innovative Talents of Science and Technology of Henan Province [grant number 174200510020], the Support Plan of Innovative Team of Science and Technology of University of Henan Province [grant number 19IRTSTHN030], the Special Project of Science and Technology of Water Conservancy of Ningxia Hui Autonomous Region [grant number TYZB-ZFCG-2017-31] and Doctoral Graduate Innovation Fund of North China University of Water Resources and Electric Power.
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