基于Fluent的凹形竖曲线底部排水口排水能力研究

Research on Drainage Capacity of Outfall at Bottom of Concave Vertical Curve Based on Fluent

凹形竖曲线底部排水口是路面表面排水设施的重要组成部分,特别是在暴雨作用下,其需要排出的水流量较一般天气、连续坡段要大得多。如何快速有效地排出路表积水是保障路面使用寿命和行车安全的重要环节。传统的排水口排水能力分析主要有经验公式法和理论分析法,在经验公式中,排水截留量计算没有考虑不同的流速、水深对排水量的影响,这与实际的流动过程有一定的差距。运用专用流体软件Fluent对不同形式排水口排水能力进行数值模拟,并与经验法进行对比研究,利用数值模拟结果对经验公式进行修正,可为凹形竖曲线底部不同形式排水口的设计提供参考。

The outfall at the bottom of concave vertical curve is an important part of road surface drainage facilities.Especially in rainstorm,its water discharge is much greater than continuous slope segment in general weather.Discharging surface water quickly and effectively is the key to ensure the service life of pavement and traffic safety.The main traditional methods of outfall drainage capacity analysis include empirical formula and theoretical analysis.The empirical formula does not consider the influence of different velocity and water depth on the displacement,therefore there is a certain gap to actual flow.The paper uses special liquid software Fluent to implement the numerical simulation about the drainage capacity of different forms of outfall.Compared to experience method,the empirical formula is revised by numerical simulation results,which can provide references to the design of different forms of outfall at the bottom of concave vertical curve.