摘要
雨水口对路面径流的截流能力直接影响城市地上排涝与地下排水管道的排水效率。通过原型尺寸物理模型试验以及CFD 3D有限元模型,重点研究了入流量、道路宽度及道路坡度3类因素对路面积水深度、雨水口截流量及截流效率3种水力参数的影响。研究结果表明:验证工况下有限元模型截流效率结果与试验结果的绝对误差均在10%以内,箅前水深绝对误差均小于3 mm,相对误差均在20%以内;对于不同的入流方式,底部涌流方式截流效率均大于前端推流方式,试验工况中最大差异达20%,最小为10%;在不同的坡度下,道路宽度对上游雨水口1箅前水深的影响程度不同,对下游雨水口2箅前水深的影响在1 mm内;纵坡对下游雨水口2截流效率及箅前水深的影响比上游雨水口1小,当纵坡为2.0%时,大部分工况下双雨水口截流效率均最高。双雨水口排水模型能较真实地反映实际降雨条件下路面径流及雨水口截流情况,可以为雨水口设计及城市防涝提供重要参考。
The ability of street inlets to intercept road runoff affects the efficiency of the urban drainage system.Based on a prototype size physical model test and a CFD 3D finite element model,this paper focuses on the effects of approaching inflow,road width and road slope on the water depth distribution and the hydraulic efficiency of inlets.The results show that the relative error of hydraulic efficiency between the simulation results and the test results is less than 10%.The absolute error of water depth in front of the grate is less than 3 mm and the relative error is less than 20%.Under different inflow modes,the efficiency of the bottom inflow method is greater than that of the front inflow method and the maximum and minimum differences are 20%and 10%,respectively.The influence of road width on the water depth in front of upstream inlet 1 changes with the slope but the differences of the water depth in front of downstream inlet 2 are less than 1 mm under different slopes.The longitudinal slope shows smaller effects on downstream inlet 2.When the longitudinal slope is 2.0%,the hydraulic efficiency of both inlets have the highest value.The dual inlets numerical model in this study can better reflect the actual road runoff and the hydraulic performance of street inlets during rainfall events and provides an important reference for a better inlet design and urban waterlogging prevention.
作者
徐灵华
曾云辉
王明铭
郭帅
XU Linghua;ZENG Yunhui;WANG Mingming;GUO Shuai(Power-China Huadong Engineering Co.,Ltd.,Hangzhou 310014,China;College of Civil Engineering,Hefei University of Technology,Hefei 230009,China)
出处
《浙江工业大学学报》
北大核心
2023年第4期418-425,465,共9页
Journal of Zhejiang University of Technology
基金
安徽省重点研发计划项目(202104i07020012)。
关键词
雨水口
截流效率
数值模拟
有限元
street inlet
hydraulic efficiency
numerical simulation
finite element
