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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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