Numerical Simulation And Experimental Study Of Flow Field In Combined Sluice-Pump Project And Intersection River

In plain river network area, the application of combined sluice-pump project is getting more and more widely because of some proper advantages, such as covering small area, low construction cost, convenient operation and management. The asymmetrical layout separate the sluice and pump station on both sides of the river, when unilateral discharge, strong backflow and deflected flow will be caused in project downstream, which not only increase the burden of energy dissipator and scour apron, but also endanger the safety of the project. If the combined sluice-pump project located in river junction upstream, the branch flow become into forced inflow to main canal by the control of project, and produce transverse velocity which primarily affect the junction navigation design. At the same time, the complicated junction flow caused by the engineering uneven drainage will further bring adverse impact on shipping safety. Therefore, the research on the outflow of combined sluice-pump project and the flow characteristics of open-channel junction has very important significance to the layout and operation of project, and ensure the safety of main channel navigation.Taking an asymmetrical combined sluice-pump project for engineering background, with3d numerical simulation and model experimentation method, the outflow of combined sluice-pump project and the junction flow has been analysed. Focusing on the analysis of the influence factors and the change law of the project outflow and junction flow, expounded the cause and harm of some bad flow patterns like backflow and deflected flow. The main contents and conclusions are as follows:(1) The research progress of the outflow of combined sluice-pump project and flow characteristic at open-channel junction has been reviewed, and the existing flow problems as well as its harm have been analyzed.(2) Numerical simulation of the flow at combined sluice-pump project downstream and confluence of open-channel has been done by using RNG κ-ε turbulence model,influence factors including length of diversion pier in downstream, distance between outlet pond to junction and operation point of pump station have been analyzed for the impact on flow pattern in outlet of project. Furthermore, this paper has studied the flow and change law of open-channel junction by change the intersection angle, flow of main or branch canal, distance between junction to upstream project, bridge piers and discharge ratio. Analysed the cause of bad tlow patterns, and put forward some improvement measures.(3) The outflow of a practical engineering has been studied by numerical simulation method based on both standard k-ε turbulence model and RNG k-ε turbulence model. The study shows that the results of RNG k-ε turbulence model are more in accordance with test results.(4) Physical model test method has been used in practical project, and the results are familiar with the simulating tendency.