
离心泵启动过程内部流动特性分析
马晓堂, 王宾, 宋文武
离心泵启动过程内部流动特性分析
An Analysis of the Internal Flow Characteristics of Centrifugal Pump during Starting
为了研究离心泵启动过程中内部流动特性,采用ANSYS CFX软件,基于RNG k-ε湍流模型对比转速为146的中比转速离心泵进行数值模拟,分析启动过程中的6个时刻所对应的内部压力分布、压力脉动以及径向力分布情况。结果表明:当离心泵启动到T=0.4 s时刻,泵扬程已经到达设计工况时刻的96.4%;随着启动时间的变化,内部压力从低到高,隔舌和叶轮出口压力脉动主频分别向叶频和轴频靠拢,径向力逐渐增大,T=0.1 s后离心泵压力脉动和径向力出现了剧烈的增长,当达到T=0.4 s时刻离心泵内部流动相对稳定,T=1 s时刻达到额定转速此时离心泵进入完全稳定状态。
In order to study the internal flow characteristics of the centrifugal pump during the startup process, ANSYS CFX software is used to perform numerical simulation based on the RNG k-ε turbulence model to compare the centrifugal pump with a speed of 146 to the intermediate speed centrifugal pump, and to analyze the internal pressure corresponding to 6 moments in the startup process distribution, pressure pulsation and radial force distribution. The results show that when the centrifugal pump starts to T=0.4 s, the pump head has reached 96.4% of the design working condition; with the change of starting time, the internal pressure changes from low to high, and the main frequencies of the pressure pulsation of the diaphragm and the impeller outlet are moving closer to the blade frequency and shaft frequency, the radial force gradually increases. After T=0.1 s, the pressure pulsation and radial force of the centrifugal pump increase drastically. When T=0.4 s, the internal flow of the centrifugal pump is relatively stable. When the rated speed reaches 1s, the centrifugal pump enters a completely stable state.
离心泵 / 启动过程 / 压力脉动 / 径向力 {{custom_keyword}} /
centrifugal pump / boot process / pressure pulsation / radial force {{custom_keyword}} /
表1 离心泵主要设计参数Tab.1 Main design parameters of centrifugal pump |
设计流量Q/(m3·h-1) | 额定转速n/(r·min-1) | 扬程H/m | 比转速ns | 进口直径D/mm | 出口宽度b2 /mm | 叶轮外径D2 /mm | 叶片数Z |
---|---|---|---|---|---|---|---|
160 | 1 450 | 15 | 146 | 142.5 | 26.4 | 240 | 6 |
表2 网格无关性验证Tab.2 Grid independence verification |
网格数方案 | 网格数目 | 效率/% |
---|---|---|
1 | 1 256 482 | 86.72 |
2 | 2 842 626 | 87.36 |
3 | 3 783 873 | 88.48 |
4 | 4 435 843 | 88.46 |
图10 启动阶段不同时刻叶轮径向力分布Fig.10 Radial force distribution of impeller at different starting stages |
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