大管径真空排水技术在雨水泵站中的应用与数值分析

针对传统雨水泵站存在的问题,介绍了大管径真空排水技术在雨水泵站应用中的独特优势及具体实施方法。为研究其排水过程中的流态分布、流体动力学性能,建立了典型管道的数值模型,采用κ-ξ紊流模型及Vof方法,对其进行了非稳态数值模拟,分析了两相流在大管径管道充水过程中的气液流动特性。结果表明:大管径排水过程中存在分层流、气泡流及波浪流,并在弯管附近出现短暂集气现象;液相在倾斜管路中有短暂流速停滞现象,随着压差的推进,最终在管道中形成液相满管流。

APPLICATION AND NUMERICAL ANALYSIS OF LARGE DIAMETER VACUUM DRAINAGE TECHNOLOGY IN RAIN WATER PUMPING STATION

For the problems of traditional rainwater pumping station，the paper introduced large diameter vacuum drainage technique in rainwater pumping station，unique advantages in application and the specific implementation methods． To study flow distribution and hydrodynamics of the drainage process，the numerical model of typical pipeline was established，using κ － ξ turbulence model and Vof method． Unsteady numerical simulation and the gas-liquid flow characteristics of the two-phase flow were analysised during water filling process in large diameter pipes． The results showed that: In large diameter drainage process，there was stratified flow，bubble flow and wave flow，and the temporary gas gathering phenomenon occured in the near elbow; liquid had a transient flow stagnation in the inclined pipe，and with the development of pressure，the liquid full pipe flow was eventually formed in the pipe．