径向式导叶多级泵非定常压力脉动特性分析  

Analysis on characteristics of unsteady pressure pulsation in radial diffuser multi-stage pump

作　　者：王昊昱 王延锋 WANG Haoyu;WANG Yanfeng(Illinois Institute of Technology,Chicago 60616;School of Mechanical and Electronic Engineering,Henan University of Technology,Zhengzhou 450001)

机构地区：[1]伊利诺伊理工学院,美国芝加哥60616 [2]河南工业大学机电工程学院,河南郑州450001

出　　处：《机械设计》2024年第7期44-52,共9页Journal of Machine Design

基　　金：国家创新方法工作专项(2019IM020200);国家科技部创新方法工作专项(2018IM020300);上海市科技计划项目(20040501300)。

摘　　要：为研究不同流量工况下径向式导叶多级泵内非定常压力脉动特性,文中以MD500-57×3型径向式导叶多级泵为研究对象,选取0.5Q,1.0Q和1.2Q这3种流量工况,运用ANSYS Fluent软件对研究对象的流体计算域进行了数值计算,通过数值计算结果与试验结果的对比分析,验证了数值方法和模拟结果的正确性与准确性,进而分析了各级叶轮进出口与各级导叶内的非定常压力脉动特性。结果表明:径向式导叶多级泵各级叶轮进口处流体压力脉动的主频以叶轮的叶频为主,主要受到本级叶轮的旋转作用影响;各级叶轮出口处压力脉动受到来流和本级叶轮旋转的共同作用,存在若干个以轴频的多倍频为频率的高频信号,且泵内流场的稳定程度影响着压力脉动源的传播与扩散;各级导叶进口处流体受本级叶轮旋转作用最为强烈,而沿着导叶流道方向的流体压力逐渐趋于平稳,但随泵级数的增加,导叶内流体压力在本级叶轮与其他级叶轮旋转作用的共同诱导下产生高频成分。In this article,in order to explore the characteristics of the unsteady pressure pulsation in the radial diffuser multistage pump under different flow conditions,the MD500-57×3 radial diffuser multi-stage pump is chosen;under three flow conditions of 0.5Q,1.0Q and 1.2Q,the ANSYS Fluent software is used to numerically calculate the pump’s fluid calculation domain.By comparing the results obtained from the numerical calculation with those obtained from the experiments,it is verified that this method of numerical calculation and the simulation results are correct and feasible.Then,the analysis is conducted on the characteristics of the unsteady pressure pulsation at each impeller’s inlet and outlet as well as the inside of each diffuser.The results show that the main frequency of the fluid pressure pulsation at each impeller’s inlet in the radial diffuser multi-stage pump is the impeller’s blade frequency,which is mainly affected by the impeller’s rotation.The pressure pulsation at each impeller’s outlet is affected by the combined effect of the incoming flow and the impeller’s rotation.There are several high-frequency signals with multiple frequencies of the shaft frequency as the frequency,and the stability of the flow field inside the pump affects the propagation and diffusion of the pressure-pulsation source.The fluid at each diffuser’s inlet is most strongly affected by the impeller’s rotation,while the fluid pressure along the flow path of the diffuser gradually stabilizes.However,with the ever-growing pump stages,the fluid pressure inside the diffuser is induced to produce high-frequency components by the rotary impeller and its counterparts.

关 键 词：径向式导叶多级泵 数值模拟 压力脉动 非定常流动 时频分析 

分 类 号：TD744[矿业工程—矿井通风与安全]