CFD simulation and optimization on inflow pattern of diversion and intake pumping stations with side-inlets

The numerical simulation and flow analysis on the inflow patterns of the diversion and intake pumping stations with side-inlets are made herein with the realizable k-e turbulent model and SIMPLEC algorithm.The analysis shows that the inflows of these kinds of pumping stations have the behaviors of bend-flows,for which the numerical simulation result coincides with that from the theoretical analysis.Based on the inflow pattern behaviors of these pumping stations,the diversion grid is suggested to be taken as the way for the hydraulic optimization concerned.By taking the momentum distribution of the inflow cross-section of pumping station and the uniformity of the mean velocity at the corss-section of intake-sump as the evaluation bases,the numerical simulations on the effects from the hydraulic optimizations through various schemes of flow regulation with diversion grid are studied.The result shows that the diversion grid has a significant effect on the regulation of the momentum distribution at the diversion section of pumping station,and then the velocity distribution of the inflow cross-section is related to the uniformity of the momentum distribution at the diversion section.Generally,a diversion grid with appropriate dimension can effectively lower the impact from the circulation of inflow and make the longitudinal velocity to be more quickly recovered to the normal distribution after the direction-shift of the flow,and furthermore,increase the uniformity of the flow distribution in the intake sump of pumping station as well.