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城市内涝问题,已成为城市发展面临的主要问题之一。在以往排水管道的设计中大部分以恒定无压流假设为前提,当发生暴雨或者排水泵掉电时,排水管道中的水位急剧增加,管道内的气体受到压缩,水流也由明流状态转换为满流状态,由此带来的排水能力不足、压力脉动剧烈甚至管道破坏日益严重,出现了新的水力学问题。本文将从排水管道中明满交替流三维模拟的问题入手,对排水管道中非恒定流现象以及管道破坏机理等问题进行深入细致的探索,以此对城市排水管道的建设提出建议。
The issue of urban waterlogging has become one of the major problems facing urban development. In the past, most of the design of the drainage pipe was based on the assumption of constant pressure-free flow. When a rainstorm or drain pump was de-energized, the water level in the drainage pipe drastically increased and the gas in the pipe was compressed. For the state of full flow, resulting in the lack of drainage capacity, severe pressure pulsation or pipeline damage worse, there has been a new hydraulic problem. This paper starts from the problem of three-dimensional simulation of open and full flow in the sewer system, explores the problems of unsteady flow in the sewer system and the failure mechanism of the pipeline, and puts forward suggestions on the construction of the urban sewer system.