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自吸泵自吸过程气液两相流数值模拟分析
刘洪生,苏永升
0
(华东理工大学承压系统与安全教育部重点实验室, 上海 200237)
摘要:
自吸泵的自吸过程是一个很复杂的气液两相混合流动与分离过程。本文利用非稳态数值模拟方法模拟自吸泵自吸过程,初始条件为进水管及出水管含有部分空气,然后估算自吸时间。模拟结果表明:泵吸气和排气主要集中在自吸初期,期间叶轮入口和泵出口气含率最高分别可达62.4%和45.3%;叶轮入口气含率变化较泵出口气含率变化剧烈;此外,叶轮与导叶间隙对自吸性能有影响,间隙与自吸时间呈负相关变化,说明较大的间隙有利于泵的自吸。
关键词:  自吸泵  自吸过程  气液两相流  非稳态数值模拟
DOI:10.14135/j.cnki.1006-3080.2017.02.020
投稿时间:2016-07-12
基金项目:
Numerical Simulation of Gas-Liquid Two-Phase Flow in Self-priming Pump During Self-priming Period
LIU Hong-sheng,SU Yong-sheng
(Key Laboratory of Pressurized Systems and Safety, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China)
Abstract:
The self-priming process of self-priming pump was a very complicated gas-liquid mixed flow and separation process.In this article,a unsteady numerical simulation was applied to simulated the self-priming process of self-priming pump,with the initial condition was that the inlet and outlet pipe filled with air,and then self-priming time was estimated;The simulation results showed that gas inhaled into and discharged of the pump were mainly concentrated in the early stage of the self-priming process,the air void fraction reached up to 62.4% and 45.3%,respectively at the impeller inlet and the pump outlet in the initial stage;The change of air void fraction in the impeller inlet was more drastic than that of the pump outlet;In addition,self-priming performance was affected by the gap between impeller and guide vane,and the data showed a negative correlation between gap and self-priming time,which revealed the lager gap was beneficial to self-priming of the pump.
Key words:  self-priming pump  self-priming process  gas-liquid two-phase flow  unsteady numerical simulation

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