排灌机械工程学报
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排灌机械工程学报  2015, Vol. 33 Issue (1): 31-36    DOI: 10.3969/j.issn.1674-8530.14.0095
泵理论与技术 最新目录 | 下期目录 | 过刊浏览 | 高级检索 Previous Articles  |  Next Articles  
多级离心泵转子固有频率影响因素的比较
王其磊
中国人民武装警察部队学院, 河北 廊坊 065000
Comparison of influence factors on natural frequency of rotor in multistage centrifugal pump
Wang Qilei
Chinese People′s Armed Police Forces Aorces Academy, Langfang, Hebei 065000, China
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摘要 为了有效改善多级离心泵转子系统的临界转速问题,利用转子动力学理论结合有限元分析方法,分析比较了几种不同因素对多级离心泵转子固有频率(可转化为临界转速)的影响,同时利用实体模型进行了振动模态数值分析,给出了相应的弯振和扭振阵型图.定量地比较了流固耦合作用和旋转软化效应对转子固有频率的影响,给出了影响转子临界转速的因素与优化方法,并将数值计算结果与试验结果进行了比较.分析表明准确地简化支承,并合理地确定支承刚度、阻尼矩阵是精确计算临界转速的必要前提; 流固耦合作用对叶片产生的液体力相当于对叶轮添加了虚质量的缘故,而旋转软化是通过科里奥利效应起作用的;多级离心泵转子的干临界转速与湿临界转速差别较大,计算值与试验值基本一致.ANSYS数值模拟具有一定的准确性,为多级离心泵的转子的设计提供了一定的参考.
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王其磊
关键词多级离心泵   转子   固有频率   流固耦合   临界转速   振动模态     
Abstract: In order to improve the critical speed of multistage centrifugal pump rotor system effectively, the effects of several impact factors on the speed or natural frequency of the rotor are analyzed and compared by means of rotor dynamics and finite element method. Additionally, the vibration modal analysis is conducted based on a whole rotor system, and the corresponding bending and torsional vibration modal shapes are provided as well. A quantitative comparison of the fluid-structure interaction and spin softening effect on natural frequency or critical speed is made, the factors affecting the critical speed of rotor and the optimization methods for the speed are given, and the numerical analysis and experimental results are compared. It is shown that accurately simplifying support, reasonably determining support stiffness and damping matrix are necessary prerequisites for precise predictions of critical speed. The fluid-structure coupling effect is equivalent to add a virtual mass on the rotor. The spin softening effect works by the Coriolis effect. The "dry" and "wet" critical speeds of multistage centrifugal pump rotor are quite different. The calculated and measured critical speeds are in good agreement. The numerical simulation of ANSYS is in a good accuracy and can provide a certain reference for the rotor design of multistage centrifugal pump.
Key wordsmultistage centrifugal pump   rotor   natural frequency   fluid-structure interaction   critical speed   vibration mode   
收稿日期: 2014-06-30;
基金资助:河北省高等学校科学技术研究项目(Z2013047)
通讯作者: 王其磊(1984—),男,天津武清人,工程师(wangqilei500@163.com),主要从事消防装备及特种材料研究.   
作者简介: 王其磊(1984—),男,天津武清人,工程师(wangqilei500@163.com),主要从事消防装备及特种材料研究.
引用本文:   
王其磊. 多级离心泵转子固有频率影响因素的比较[J]. 排灌机械工程学报, 2015, 33(1): 31-36.
WANG Qi-Lei. Comparison of influence factors on natural frequency of rotor in multistage centrifugal pump[J]. Journal of Drainage and Irrigation Machinery Engin, 2015, 33(1): 31-36.
 
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