导叶安装角度对离心泵叶轮结构特性的影响  

Influence of guide vane installation angle on structural characteristics of centrifugal pump impeller

作　　者：裴吉[1] 刘总帅 王文杰[1] 韩振华 PEI Ji;LIU Zongshuai;WANG Wenjie;HAN Zhenhua(National Research Center of Pumps,Jiangsu University,Zhenjiang,Jiangsu 212013,China)

机构地区：[1]江苏大学国家水泵及系统工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2024年第3期217-222,229,共7页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家自然科学基金资助项目(51879121);江苏省自然科学基金资助项目(BK20190851)。

摘　　要：为提高带导叶蜗壳式离心泵的运行稳定性,研究了不同导叶安装角度对离心泵性能及叶轮结构力学响应的影响.以某带导叶蜗壳泵为研究对象,首先对其进行流场数值模拟,再通过静态和瞬态结构分析模块将水压力载荷导入叶轮结构,以实现单向流固耦合分析,研究不同导叶安装角度下叶轮变形与等效应力变化规律,最后通过模态分析研究叶轮结构的振动特性.结果表明:随着导叶安装角度减小,泵的高效区向小流量工况偏移,并且最高效率逐渐增大,最大提高2.1%;单向流固耦合分析得到的稳态结果与瞬态结果规律一致,其中叶轮最大变形量和最大等效应力值都随流量的增大而减小,在设计工况附近,都随导叶安装角度的减小而减小,最大差值为3.3%,且最大等效应力值变化的幅值较小;预应力对叶轮干模态固有频率的影响可忽略不计,与干模态对比,湿模态下的固有频率有较显著下降.To enchance the operation stability of a volute centrifugal pump with guide vanes,the impact of varying guide vane installation angles on both the performance and structural mechanical response of the centrifugal pump was studied.Taking a volute pump with guide vanes as the research object,numerical simulation of its flow field was firstly conducted.Then,employing the static and tran-sient structural analysis modules,the hydrostatic pressure load was introduced into the impeller structure to achieve one-way fluid-solid coupling analysis.This analysis aimed to explore the variation patterns in impeller deformation and equivalent stress under different installation angles of the guide vanes.Finally,the vibration characteristics of the impeller structure were studied through modal analysis.The results show that when the installation angle of the guide vane decreases,there is a notable shift in the high-efficiency region of the pump towards lower flow rates.Moreover,it is observed that the maximum efficiency of the pump gradually increases,exhibiting a maximum improvement of 2.1%.The steady-state results obtained from one-way fluid-structure interaction are consistent with the transient results.Furthermore,both the maximum deformation of the impeller and the maximum value of equivalent stress decrease with the flow rate increases.Near the design operating point,reducing the installation angle of the guide vane results in a maximum difference of 3.3%in these values,and the change in the maximum equivalent stress is relatively small.The influence of prestress on the natural frequency of the impeller in the dry mode is negligible.The natural frequency in the wet mode has a significant decrease when compared to the dry mode.

关 键 词：带导叶蜗壳式离心泵 导叶安装角度 单向流固耦合 预应力 模态 

分 类 号：S277.9[农业科学—农业水土工程] TH311[农业科学—农业工程]