Numerical Investigations Of Flow Pattern And Anti-Vortex Measures Of The Pumping Station Forebay

The main objective of this study is to improve the problem of turbulence in the forebay of the lateral inlet pumping station.The forebay of the pumping station is a building connecting the river channel and the pumping station into the water tank.The forebay has two types:lateral inlet pool and positive inlet pool.The front pool’s flow pattern should match the standards for smooth water flow,a consistent velocity distribution and no adverse hydraulic circumstances such as vortex and back flow,so that the water flows smoothly into the pool,thus ensuring adequate water intake for the pump suction pipe.Also,reflux,vortex,and water flow disturbances in the forebay could lead to degradation of water absorption conditions,noise,and other issues.Bad flow patterns in the forebay,especially in rivers with high sediment concentrations,can cause silting and scouring at the river’s bottom.As a result,increasing the effectiveness of the pumping system and estimating sediment deposition by engineering measures is critical.A case study of a typical lateral inlet pumping station project in Xuzhou,Jiangsu Province,China was taken as the research objective.The research is a study of the water flow pattern numerically,which is investigated to the original model and compared to the numerical results for proposed models.Five proposed models are presented in order to diminate the problem of turbulence in the front pool of the lateral inlet pumping station.The computational fluid dynamics method（CFD）technology compares and analyses the numerical simulation with or without rectification measures for the fore-bay of the lateral intake pumping station when multiple units are operating,based on the Reynolds-averaged Navier-Stokes（RANS）law and the k-ε turbulence model.Through CFD,we can use a computer to analyze and display the flow field phenomenon,can predict,and analyze the flow field in a short time.Various rectification procedures were employed to modify the flow pattern in the pumping station’s forebay.Internal rectification flow patterns in the forebay under numerous designs are explored and compared,as well as the uniformity of flow velocity distribution in the measurement section and vortex area reduction rates.According to the analysis and comparison of numerical simulation findings,when the parabolic wall and some rectification piers are significantly set,it improves and stabilizes the flow pattern of the lateral input pumping station’s forebay.It also makes the flow pattern of the inlet pool better and increases the uniformity of the flow velocity distribution by 8%.Further,it reduced the vortex area in front of the whole forebay by 70.56%,also reduced the vortex area in front of the pump station 80.67%by effectively improving the operating efficiency of the pump.The research results of this thesis provide a technical reference for the improvement of the flow pattern in the forebay of the lateral inlet pumping station.