超低比转速复合式离心泵内部流动特性分析  

Analysis of Internal Flow Characteristics of Compound Centrifugal Pump with Ultra-low Specific Speed

作　　者：李祥阳[1,2] 曹鹏 晁文雄 刘书岩 陶佳欣 郗艺婷 LI Xiang-yang;CAO Peng;CHAO Wen-xiong;LIU Shu-yan;TAO Jia-xin;XI Yi-ting(School of Mechanical and Electrical Engineering, Xi'an University of Architecture and Technology, Xi'an, Shaanxi 710055;Hydraulic Technology Research Institute, Xi'an Aviation University, Xi'an, Shaanxi 710077;AVIC Qing-an Group Co. , Ltd. , Xi'an, Shaanxi 710077)

机构地区：[1]西安建筑科技大学机电工程学院,陕西西安710055 [2]西安航空学院液压技术研究院,陕西西安710077 [3]航空工业庆安集团有限公司,陕西西安710077

出　　处：《液压与气动》2022年第1期31-40,共10页Chinese Hydraulics & Pneumatics

基　　金：国家自然科学基金(51575420);陕西省自然科学基础研究计划(2021JM-52,2021JM-525)。

摘　　要：为研究超低比转速复合式离心泵内部流动特性,以一台比转速为16、半开式复合叶轮离心泵为研究对象,应用ANSYS-Fluent19R1软件对模型泵进行三维全流场数值模拟计算,得出泵内部流场及作用在叶轮、蜗壳上的径向力分布规律。结果表明:在不同流量工况下,随着流量的增加,在隔舌附近出现较大的压力梯度;在长叶片与短叶片相间隔流道内低速区面积较大、叶轮出口处分布较多的旋涡;当流量从0.2倍增加至1.8倍额定流量时,作用在蜗壳上的径向力幅值逐渐减小,作用在叶轮上的径向力幅值先减小后增加,在1.0倍额定流量时径向力幅值达到最小,而后增大。为超低比转速复合式离心泵的设计优化提供参考。In order to study the internal flow characteristics of the ultra-low specific speed compound centrifugal pump,a semi-open compound impeller centrifugal pump with a specific speed of 16 was taken as the research object.The three-dimensional full flow field numerical simulation was carried out on the model pump by using ANSYS-Fluent19R1 software,and the internal flow field of the pump and the radial force distribution law acting on the impeller and volute were obtained.The results show that under different flow conditions,with the increase of flow,a large pressure gradient appears near the tongue.The low speed area in the long and short blade interval flow passage is larger,and more vortices are distributed at the outlet of the impeller.When the flow rate increases from 0.2 to 1.8 times rated flow,the radial force amplitude acting on the volute decreases gradually,while the radial force amplitude acting on the impeller decreases first and then increases.At 1.0 times rated flow,the radial force amplitude reaches the minimum and then increases.It provides a reference for the design optimization of the compound centrifugal pump with ultra-low specific speed.

关 键 词：超低比转速离心泵 复合式叶轮 数值模拟 内部流动特性 径向力 

分 类 号：TH137[机械工程—机械制造及自动化] TH311