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                      Exploration of flow pattern optimization in the forebay of a sediment-laden pump
                                            station based on the adjoint method

                                        1,2        1,2          1,2          1,2             1,2

                          WANG Haidong ,XU Dong ,RAN Qihua ,YUAN Saiyu ,TANG Hongwu






                          (1. College of Water Conservancy& Hydropower Engineering,Hohai University,Nanjing  210098,China;
                                   2. Key Laboratory of Hydrologic-Cycle and Hydrodynamic-System of Ministry of



                                         Water Resources,Hohai University,Nanjing  210098,China)


                Abstract:In the forebay of a forward intake pumping station in a sediment-laden river,the sudden cross-sectional
                expansion readily leads to the formation of vortices,which cause significant sediment accumulation,which interfere


                with the normal operation of the pumping station. To address this issue,measures such as the installation of diversion

                piers are commonly employed to optimize the flow conditions. However,traditional optimization methods face signifi⁃


                cant  bottlenecks,including  numerous  combinations  of  operating  conditions,strong  subjectivity,and  reliance  on


                empirical approaches,which hinder the achievement of optimal design solutions. This study integrates adjoint optimi⁃

                zation algorithms from aerodynamics with the theory of two-phase water-sediment flow. By solving the sensitivity func⁃
                tion,both the flow field equation and the adjoint equation are iteratively solved simultaneously,achieving optimiza⁃


                tion  of  the  water-sediment  flow  state  in  the  pumping  station  forebay.  The  results  indicated  that  for  the  traditional
                octagonal  diversion  pier,the  adjoint  optimization  method  was  applied  to  fine-tune  its  geometric  shape,effectively



                eliminating large-scale vortices. The uniformity of characteristic cross-sectional flow velocity reached 90.23%,while

                the vortex structure volume decreased by 85.47% compared to no rectification measures,and by 75.32% compared to
                the  traditional  diversion  pier  scheme.  Additionally,sediment  deposition  was  reduced  by  65.22%.  The  optimization

                outcomes were highly significant. The proposed optimization algorithm provides a novel approach for the deep optimi⁃
                zation and efficient operation of pumping station forebays.


                Keywords:sediment-laden river;adjoint optimization algorithm;two-phase water-sediment flow;sediment deposi⁃


                tion;vortex structure

                                                                             (责任编辑:鲁  婧  韩  昆)
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