The influence of forebay diffusion angle on inflow pattern in large pumping station
Based on the basic design parameters of a large low-head pumping station and the Navier-Stokes equations as well as RNG k-εturbulence models,three-dimensional turbulent flow numeri-cal simulations are carried out to study the influence of forebay diffusion angle on the inlet flow pat-tern of the large low-head pumping station.Under different forebay diffusion angles and different start-up combination conditions,the changes of inlet flow regime,velocity distribution uniformity,and and lateral velocity are analyzed and verified by physical model tests.The research results indi-cate that the vortex zone is existed in the forebay,and a large transverse flow velocity is existed in front of the inlet channel during asymmetric operation of large pumping station.As the diffusion angle of the forebay decreases,the range of vortice decreases and the flow deviation situation improves during asymmetric operation of the pump.The flow pattern in the forebay gradually improves,and the transverse velocity in front of the inlet channel decreases significantly,the veloci-ty distribution uniformity at the inlet channel increases,and the inlet condition of the inlet channel improves.The numerical simulation results of the inlet flow regime under different diffusion angles in the forebay are consistent with the model test results.The research results have a certain refer-ence value for the design of the forebay of large low-lift pumping stations.
pumping stationforebaydiffusion angleinlet flow regimenumerical simulationmodel test
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