多级离心泵转子的流固耦合特性及试验分析.pdf

FLUID MACHINERY
Vol.43,No.7,2015
文章编号:1005-0329(2015)07-0010-06
多級离心泵转子的流固耦合恃性及试验分析
王其磊,陈国栋
(1.中国人民武装警察部队学院,河北廊坊0650002浙江省金华消防支队,浙江金华321000)
摘要:针对高功率密度液体多级离心泵的高速化发展带来的流固耦合及临界转速等问题,根据流固耦合计算方法,
并应用 Ansys软件系统对流场网格进行划分和边界条件设定,然后进行数值模拟计算。计算结果表明:首级叶轮到后部
末级叶轮应力、应変和变形呈增大趋势,这符合多级泵叶轮受力分布的实际情况,流固耦合相对于重力来说发挥了更显
著的作用。可以看出流固耦合后转子固有频率降低,并且阶数越高,下降幅度越大,旋转软化效应对第一阶弯振影响较
小,而对二、三、四阶的影响逐渐增强,且随转速均匀增加,弯振频率均匀变化。试验测试结果与仿真结果具有较好的一
致性,反映了仿真数据的正确性。
关键词:多级离心泵;流固耦合;临界转速;固有频率
中图分类号:TH311
文献标志码:A
doi:10.3969/j.issn.1005-0329.2015.07.003
Characteristic and Experimental of Fluid-structure Interaction of Multistage Pump Rotor
WANG Qi-lei, CHEN Guo-dong
(1. Chinese Peoples Armed Police Forces Aorces Academy, Langfang 065000, China
2. Zhejiang Jinhua Fire Detachment, Jinhua 321000, China)
Abstract The fluid-structure interaction and critical speed problems from the high speed development the multistage centrif
gal pump of high power density fluid based on the fluid-structure equations of fluid flow and solid system, the grid division of
flow field and boundary conditions were set by applying Ansys software, and the vibration test rig was set up, The calculation re
sults show that the stress strain and deformation of the head to the back of the impeller showed a increase trend, this accords
with the actual situation of the stress distribution of multistage pump impeller, the fluid-structure interaction relative to gravity
has played a more prominent role, it can be seen after the fluid-structure coupling rotor natural frequency is reduced, and the
higher order lead to the greater drop, the spin softening effect on the first order bending vibration was small, and the influence of
the two, three, four order gradually strengthen, and with increasing uniform speed, the bending vibration frequency uniform
change. Through the experiment test and the simulation results had good consistency, which reflected the correctness of the sim
ulation data
Key words multistage pump; fluid-structure interaction critical speed; natural frequency
前言
到人们的关注“1。并且随着对泵扬程要求不断
提高,多级离心泵必然要跨越临界转速,为了确保
随着高功率密度液体多级离心泵的高速化发临界转速平稳过渡,并且确保泵的振动水平降到
展(离心泵的流量是由叶轮的通道面积与其叶片最低以提高泵的使用寿命,因此有效地对泵体的
的角度B2及其圆周速度决定的。多级离心泵对转子动力学及流固耦合特性研究具有重要意
液体的离心力成正比增加,多级离心泵的压力也义3“?。刘厚林等利用双向流固耦合的方法对叶
成正比增加,压力曲线则向上移动,从而使得出口轮的流固耦合特性进行了分析,并给出了导叶式
压力明显增加),多级泵流固耦合问题越来越受离心泵叶轮结构优化设计方法?;施卫东等利用
收稿日期:2014-08-15修稿日期:2015-06-05
基金项目:河北省高等学校科学技术研究项目(Z2013047)