排灌机械工程学报
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排灌机械工程学报  2019, Vol. 37 Issue (5): 387-392    DOI: 10.3969/j.issn.1674-8530.18.1241
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多级离心泵多工况内部压力脉动数值计算
黄凯乐Symbol`@@,袁建平*,司乔瑞,林刚
江苏大学国家水泵及系统工程技术研究中心, 江苏 镇江 212013
Numerical simulation on pressure pulsation in multistage centrifugal pump under several working conditions
HUANG Kaile, YUAN Jianping*, SI Qiaorui, LIN Gang
National Research Center of Pumps, Jiangsu University, Zhenjiang, Jiangsu 212013, China
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摘要 为研究多级离心泵内部压力脉动特点和瞬态流动特征,以三级卧式离心泵模型为研究对象,采用DES方法进行了4种不同流量工况下的全流场非定常数值模拟.为保证划分的网格准确反映多级离心泵内流动特性,进行网格无关性分析.通过定常计算的扬程效率和外特性试验值进行对比,证明数值模拟的可靠性.在每级叶轮、正导叶、反导叶上共设置36个监测点,通过分析模拟数据得出压力标准差值图、系数图和频域图.结果表明:导叶喉部是低压区频繁出现的区域,不同流量下,压力脉动呈现周期性变化规律,脉动强度以正导叶最为剧烈,偏离设计流量工况,压力标准差幅值增大.不同流量下,多级离心泵正导叶流道内压力脉动主频为叶频(327 Hz),倍频处峰值衰减迅速.研究成果为揭示多级离心泵内部压力脉动规律提供一定的理论参考.
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黄凯乐Symbol`@@
袁建平*
司乔瑞
林刚
关键词多级离心泵   压力脉动   多工况   数值计算     
Abstract: In order to study the characteristics of pressure pulsation and unsteady flow features in multistage centrifugal pumps, a three-stage centrifugal pump model served as flow simulation object. The DES method was used to simulate the unsteady flow in the pump under four working conditions. The reliability of numerical simulation was demonstrated by comparing the predicted performance with the measured characteristic. Thirty-six monitoring points were set up in the impeller, radial diffuser and return channel in each stage. It is shown that the throat of the radial diffuser is subject to a pressure pulsation in low frequency. At different flow rates, the pressure pulsation presents periodicity and the most pulsation intensity occurs in the radial diffuser, but also the amplitude of pressure pulsation increases when the working point deviating from the design flow condition. At different flow rates, the main frequency of pressure pulsation in the radial diffuser is the blade passing frequency of 327 Hz and the peak amplitude at the blade passing frequency multiplied by an integer is attenuated rapidly. The results provide a theoretical reference to revealing pressure pulsation law in multistage centrifugal pumps.
Key wordsmultistage centrifugal pump   pressure fluctuation   multiple conditions   numerical simulation   
收稿日期: 2018-05-21;
基金资助:中国博士后科学基金特别资助项目(156993);河南省节水农业重点实验室开放基金资助项目(FIRI2017-20-01)
引用本文:   
黄凯乐Symbol`@@,袁建平*,司乔瑞等. 多级离心泵多工况内部压力脉动数值计算[J]. 排灌机械工程学报, 2019, 37(5): 387-392.
HUANG Kai-Le-Symbol`@@,YUAN Jian-Ping-*,SI Qiao-Rui et al. Numerical simulation on pressure pulsation in multistage centrifugal pump under several working conditions[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(5): 387-392.
 
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