液氨泵启动过程及压力脉动特性数值研究  

Numerical Study on Start-up Process and Pressure Pulsation Characteristics of Liquid Ammonia Pump

作　　者：刘海川 曹怀东 胡玉针 甄勇 许明双 苗森春 LIU Hai-chuan;CAO Huai-dong;HU Yu-zhen;ZHEN Yong;XU Ming-shuang;MIAO Sen-chun(Chongqing Hongjiang Machinery Co.,Ltd.,Chongqing 402160,China;School of Energy and Power Engineering,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]重庆红江机械有限责任公司,重庆402160 [2]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《液压气动与密封》2025年第2期61-66,共6页Hydraulics Pneumatics & Seals

摘　　要：以液氨离心泵为研究对象,使用专业流场仿真软件Fluent,基于RNG k-ε湍流模型,采用SIMPLEC算法和转速控制方程对液氨泵启动过渡过程进行数值模拟。预测了液氨离心泵的转速和流量曲线,分析了启动过程中不同时刻叶轮流道内压力场和速度场的变化情况,并研究了启动过程中叶轮和蜗壳内的压力脉动特性。结果表明:本次数值计算能较为真实的模拟液氨泵的启动过程,研究方法合理可靠;叶轮流道内的压力场和速度场在叶轮转速达到稳定时也随之变得稳定,速度场达到稳定的时间比压力场更早一些;启动过程中叶轮和蜗壳内压力脉动曲线可大致分为3个阶段,在最后1个阶段即围绕一稳定值上下波动阶段,从叶轮进口到出口,压力波动幅度逐渐变大,蜗壳内隔舌处压力波动幅度最大。This paper takes liquid ammonia centrifugal pump as the research object,uses professional flow field simulation software Fluent,based on RNG k-εturbulence model,adopts SIMPLEC algorithm and speed control equation to numerically simulate the transition process of liquid ammonia pump starting.The speed and flow curve of liquid ammonia centrifugal pump are predicted,the changes of pressure field and velocity field in impeller channel at different time during start-up are analyzed,and the pressure pulsation characteristics in impeller and volute are studied.The results show that the numerical calculation can simulate the starting process of liquid ammonia pump,and the research method is reasonable and reliable.The pressure field and the velocity field in the impeller channel become stable when the impeller speed reaches stability,and the velocity field reaches stability earlier than the pressure field.The pressure pulsation curve in the impeller and volute can be roughly divided into three stages.In the last stage,which is the fluctuation stage around a stable value,the pressure fluctuation amplitude gradually increases from the inlet of the impeller to the outlet,and the pressure fluctuation amplitude is the largest at the inner tongue of the volute.

关 键 词：液氨泵 数值模拟 启动过程 内流场 压力脉动 

分 类 号：TH137[机械工程—机械制造及自动化] TH311