n municipal drainage pipelines,long term operation can cause local blockage,reduce the flow capacity,and affect the normal operation of drainage pipelines.This study presents a numerical model of two-phase air-water flow for circular cross-section drainage pipes with localized clogging,the hydraulic characteristics of drainage pipes with localized clogging under non-steady inflow boundaries were simulated using CFD mothods,and the force exerted on sedimentation or obstacles under different operating conditions was quantitaively analyzed.The results analysis showed that under dry-pipe initial conditions,the maximum force on the obstacle occurs during the impact moment,and this impact force can be approximated using the jet impinging with a relative error of less than 10％.On the other hand,under wet-pipe conditions(with base flow initially),the impact force of water flow on obstacles is significantly lower than that of dry-pipe conditions.In addition,under wet-pipe conditions,the intensity of the impact of increased flow on obstacles is closely related to the initial submerged conditions.
关键词
排水系统/管道淤积/管道固体障碍物/水流冲击力/受力变化
Key words
drainage system/pipeline sedimentation/solid obstacles in pipelines/water flow impact pressure/force variation
维普
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