多级离心泵径向导叶内压力的脉动特性  

Analysis on pressure fluctuation of radial diffusers in a multistage centrifugal pump

作　　者：刘厚林[1] 周孝华[1] 王凯[1] 毛陆敏 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013 [2]扬州长江水泵有限公司,江苏扬州225200

出　　处：《中南大学学报（自然科学版）》2014年第9期3295-3300,共6页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51109095;51209105);国家科技支撑计划项目(2011BAF14B03;2013BAK06B02);江苏省自然科学基金资助项目(BY2011140);江苏省科技支撑(工业)项目(BE2012129;BE2012131)

摘　　要：为研究多级离心泵各级导叶流道进口处压力脉动的变化规律,采用SST k-ω湍流模型对1个五级离心泵设计工况下的内部非定常流动进行整机数值模拟,监测各级径向导叶单流道进口同一圆周上3点的压力脉动,并对其进行时域和频域分析,同时比较各监测点的压力波动幅值。结果表明:在设计工况下,叶片通过频率是主要影响频率,p1和p2位置压力脉动的最大波动幅度出现在1倍叶频处;在同一位置的压力波动,首级导叶内的波动最为剧烈,且在p11位置压力波动幅值达到8.25%,第2,3,4和5级导叶内压力波动基本同步,压力波动幅度随泵级数的增加逐渐降低。In order to study the pressure fluctuation variation of radial diffusers in multi-stage centrifugal pumps, the SST k-ω turbulence model was applied to simulate the unsteady flow under the design condition in a five-stage centrifugal pump. The pressure fluctuations of three points which were located at import of single channel of five radial diffusers on the same circle were monitored. Time domains and frequency spectra of three points on each radial diffuser were analyzed and pressure fluctuation amplitudes were compared. The results show that the blade passing frequency dominates the pressure fluctuations in the design condition. The maximum fluctuation amplitude of p1, p2 position occurs at one time of blade passing frequency. The pressure of the first diffuser is fluctuated dramatically at the same place, while the maximum amplitude in p11 position reaches 8.25%, and the pressure fluctuations of the second, third, fourth and fifth diffuser are basically synchronous, and the amplitude of pressure fluctuation is reduced gradually with the increase of pump stage.

关 键 词：五级离心泵 径向导叶 压力脉动 

分 类 号：TH311[机械工程—机械制造及自动化]