流体机械

2020, v.48;No.572(02) 53-57

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射流式离心泵气液两相流数值分析
Numerical Analysis of Gas-liquid Two-phase Flow in Flow-ejecting Self-priming Centrifugal Pump

王维军;李泰龙;
Wang Weijun;Li Tailong;Avic Chengdu Caic Electronics Co.,Ltd.;

摘要(Abstract):

射流式离心泵是一种特殊的流体机械,采用射流器与离心泵组合的方式设计,以牺牲一部分效率来提高离心泵抗空化性能,增大吸程。基于CFD技术,针对射流式离心泵进行了定常气液两相流数值求解。设定进口处气体的容积含气率分别为5%,10%,15%和20%,气泡直径为0.1 mm,在单相计算收敛后数值模拟了气液两相全流场。结果表明:当含气率0.05时,泵性能不会发生较明显的变化;喷嘴到叶轮进口20~90 mm之间液相速度大于气相速度,气液两相速度差为1~2 m/s;在喷嘴到叶轮进口90~150 mm之间时气相速度大于液相速度,两相最大速度差为4 m/s。
The flow-ejecting self-priming centrifugal pump is a special kind of fluid machinery,which is designed in a manner of combination of ejector and centrifugal pump.It improves cavitation resistance and increase suction head of the pump by sacrificing part of efficiency.Based on CFD technology,a flow-ejecting self-priming centrifugal pump was selected to simulate the steady and unsteady flow field in gas-liquid two-phase flow and explore the characteristics of the pump so as to obtain a design principle.Given the volume fraction (GVF) of gas in pump inlet is 5%,10%,15% and 20%,respectively and bubble diameter is 0.1 mm,the gas-liquid two-phase whole flow field was simulated numerically after convergent value was calculated for a single phase.The results show that when the GVF was 0.05,no obvious change would take place in pump performance.The velocity of liquid phase in the range of 20~90 mm between the nozzle and impeller entrance was larger than gas phase velocity,the difference between then was 1~2 m/s.The velocity of liquid phase in the range of 90~150 mm between the nozzle and impeller entrance was larger than gas phase velocity,and the difference between them was 4 m/s.

关键词(KeyWords): 两相流;自吸泵;湍流模型;射流装置
two-phase flow;self-priming pump;turbulence model;jet device

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基金项目(Foundation): 流体机械及工程四川省重点实验室(重点研究基地)开放课题资助项目(szjj2019-029);; 航空工业成都凯天电子股份有限公司预研项目(Y1910、Y1920)

作者(Author): 王维军;李泰龙;
Wang Weijun;Li Tailong;Avic Chengdu Caic Electronics Co.,Ltd.;

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