多级冲压泵固液两相流冲蚀特性  

Erosion characteristics of solid-liquid two-phase flow in multi-stage stamping pumps

作　　者：郑水华[1] 牟成琪 张文奇 张冯烨 牟介刚[1] ZHENG Shuihua;MOU Chengqi;ZHANG Wenqi;ZHANG Fengye;MOU Jiegang(College of Mechanical Engineering,Zhejiang University of Technology,Hangzhou 310014,China)

机构地区：[1]浙江工业大学机械工程学院,杭州310014

出　　处：《振动与冲击》2020年第9期214-220,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51476144)。

摘　　要：基于离散相模型和标准k-ε湍流模型,对多级冲压泵首级和次级流场进行数值模拟。计算不同固相颗粒质量浓度时的外特性和过流部件冲蚀特性,分析颗粒体积分数分布、流场速度和颗粒运动轨迹,研究其对冲蚀特性的影响。结果表明:随着颗粒浓度的上升,冲压泵的单级扬程和效率线性衰减,当颗粒质量浓度为90 kg/m^3时,单级扬程下降6.89%,效率下降6.95%;叶轮和导叶的冲蚀率与颗粒质量浓度指数正相关,叶片与后盖板的连接处、导叶叶片转弯部分的磨损率最高;较高的颗粒浓度与冲击速度、更为频繁的颗粒冲击是造成上述区域较高的冲蚀率的主要原因。Based on the discrete phase model and the standard k-εturbulence model,the flow fields in the first and second stages of a multi-stage stamping pump were numerically simulated to calculate the performance and the erosion characteristics of the over-current components under different particle mass concentrations.The particle volume fraction distribution,flow field velocity,and particle motion trajectory were analyzed to study the effects of particle parameter on erosion characteristics.The results show that with the increase of particle concentration,the single stage head and efficiency of the stamping pump are linearly attenuated.When the particle mass concentration is 90 kg/m^ 3,the single stage head decreases by 6.89%,and the efficiency decreases by 6.95%.The erosion rate of the impeller and the vane is exponentially and positively correlated with the particle mass concentration.The erosion rate of the joint between the blade and the rear cover as well as the turning portion of the vane blade is the highest.Higher particle concentration,high impact velocities,and more frequent particle impacts are the main reason for the higher erosion rate in the above regions.

关 键 词：冲压泵 固液两相流 冲蚀 颗粒轨迹 

分 类 号：TH311[机械工程—机械制造及自动化]