基于CFD的中高比转速离心泵叶轮的设计方法  

CFD-based impeller design method of medium-high specific speed centrifugal pump

作　　者：赵万勇[1] 王磊[1] 赵爽[1] 王钊[1] 杨登峰[1] 

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2013年第2期35-38,共4页Journal of Lanzhou University of Technology

摘　　要：采用了一元理论和二元理论有势流动规律2种设计方法,对中高比转速离心泵叶轮进行水力设计.采用Flu-ent数值模拟,分别计算叶轮叶片的轴面速度和速度矩,通过分析叶片的轴面速度分布曲线和速度矩分布曲线,验证基于一元理论的叶片轴面速度并非沿过水断面均匀分布,二元理论有势流动设计方法可以设计出叶片内大部分流体满足轴面流动为有势流动的叶轮,但是设计方法尚不成熟.通过CFD计算可以得到泵的特性曲线,采用一元理论设计的叶轮的水力性能好于采用二元理论设计的叶轮,在用二元理论进行叶轮的水力设计中,速度矩分布规律曲线的选取对叶轮的水力性能影响很大.Impellers of medium-high specific speed centrifugal pump were designed based on both the one- dimensional and two-dimensional design theory. Meridional velocity and velocity moments distribution on the blade were simulated numerically with Fluent. It was confirmed by analyzing these distribution curves that the distribution of meridional velocity on the blade based on one-dimensional theory was uniform along the flow passage cross-section. By means of two-dimensional theory and potential flow distribution meth- od, an impeller with potential flow over the most part of the blade might be designed, but this approach was not yet. The performance curve of pump could be obtained with CFD, hydraulic performance of one- dimensional theory-based impeller would be better than that of two-dimensional theory-based impeller. And velocity moments distribution on blade would be a key factor affecting the hydraulic performance of the two-dimensional theory-based impeller.

关 键 词：离心泵 叶轮 设计理论 轴面速度 速度矩 

分 类 号：TH131[机械工程—机械制造及自动化]