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气液比是真空排水系统的关键设计参数,了解其影响因素和数值确定方法对实现系统的节能、高效运行至关重要。气液两相流的流型是气液比的重要影响因素,二者关系的本质是气相速度与气液比的关系。借助气液两相流理论,总结了气相实际速度与气液比的定量关系,并借此对目前实际工程中使用的气液比经验值进行合理性检验。结果表明,对于按锯齿型铺设的真空排水管道,现有气液比经验值能够确保流体在管道提升段前端的低洼处形成环状流,可以保证污水被顺利输送。因此,现有气液比经验值对锯齿型铺设的真空排水管网基本适用。
Gas-liquid ratio is the key design parameter of vacuum drainage system. It is very important to understand the influencing factors and the methods of numerical determination to realize the energy-saving and efficient operation of the system. The flow pattern of gas-liquid two-phase flow is an important influencing factor of gas-liquid ratio. The essence of the relationship between the gas-liquid two-phase flow is the relationship between gas-phase velocity and gas-liquid ratio. Based on the theory of gas-liquid two-phase flow, the quantitative relationship between the actual velocity of gas phase and the gas-liquid ratio is summarized, and the rationality of the empirical value of gas-liquid ratio used in practical engineering is verified. The results show that the existing gas-liquid ratio vacuum drainage pipelines can ensure that the fluid forms an annular flow in the low-lying area at the front end of the pipeline lifting section, so as to ensure the smooth delivery of the sewage. Therefore, the existing gas-liquid ratio empirical value of zigzag-type vacuum drainage network is basically applicable.