排水箱涵气水两相流数值模拟

Numerical Simulation of Open Channel Flow in Sewer Culvert

为降低排水箱涵腐蚀速率,预防特大排水箱涵因腐蚀造成的安全隐患,亟需研究排水箱涵腐蚀机理及规律。结合流体动力学数值模拟技术,利用流体体积模型模拟带有浅水波的气水两相流。设置气、液、箱涵壁面边界条件,模拟排水箱涵气水两相流,观察自由液面浅水波,分析气相和液相流场特征及气相涡流分布。结果表明,排水箱涵流体动力学数值模拟结果与实测数据、箱涵腐蚀理论一致。排水箱涵流体动力学数值模拟技术可为降低排水箱涵腐蚀速率提供数据支持。

To reduce the risks to the drainage system,it is urgent to study the corrosion mechanism of sewer culvert. In combination with computational fluid dynamics (CFD) numerical simulation technology,the volume of fluid (VOF) method was used to simulate an open channel flow with shallow water waves. The experiment set the boundary conditions of gas,liquid,and box culvert walls,simulated the gas-water two-phase flow in the sewer culvert,observed the shallow water waves at the free liquid surface,and analyzed the characteristics of gas and liquid flow fields as well as the distribution of gas vortices. It showed that the CFD simulation results were in consistent with the experimental data and the corrosion mechanism of sewer culvert. Therefore,the CFD simulation of the sewer culvert could provide simulated data for reducing the corrosion rate of sewer culvert.