摘要
Abstract
[Objective]In order to study the hydraulic flushing flow characteristics in gate flushing building of the storage tank,improve the adverse flow pattern during flushing and flushing efficiency of water storage buildings,[Methods]the gate flushing flow pattern in the rainwater storage tank building of Shanghai was numerically simulated in this study based on the the renormalization group(RNG)k-ε turbulence model.In order to facilitate the visualization of the flushing efficiency of the storage tank,a comprehensive evaluation index of the flushing efficiency was proposed on the basis of the maximum flushing flow rate and the effective flushing time.Taking the comprehensive evaluation index(F)as the target parameter,the optimal corridor structure design parameters were obtained.[Results]Controlling the opening degree of the portal flushing gate can effectively improve the efficiency of corridor flushing.When the gate opening was 60°,the average effective flushing time was increased by 28％to 1.36 s,and F was increased by 12％to 0.28,compared with the traditional gate free outflow.The rectification measures of"diversion slope"near the gate end of the regulating reservoir gallery can effectively improve the adverse flow patterns such as backflow and vortex in the triangular water drop area at the bottom of the gate.By simulating the flushing process of diversion slope with different slopes,it was concluded that when the slope of diversion slope was 60°,the average effective flushing time was the longest,which was 6.95 s,the average maximum flushing velocity was the fastest,which was 4.06 m/s,and the F was 0.90.[Conclusion]The research puts forward the optimization countermeasures for the design of the portal flushing gate and the storage tank corridor.It is suggested that the cleaning effect of the gate flushing system of the storage tank should be improved by controlling the opening degree of the gate flushing gate and adding the diversion slope,so as to reduce the number of manual cleaning,save the operation cost and reduce the safety hazards.The research provides theoretical basis and practical guidance for the design and management of the gate flushing system of the storage tank.关键词
调蓄池/门式冲洗系统/水流流态/数值模拟/水力冲洗Key words
storage tank/gate flushing system/flow pattern/numerical simulation/hydraulic flushing分类
建筑与水利
