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.
出处
《兰州理工大学学报》
CAS
北大核心
2013年第2期35-38,共4页
Journal of Lanzhou University of Technology
关键词
离心泵
叶轮
设计理论
轴面速度
速度矩
centrifugal pump
impeller
design theory
meridional velocity
velocity moments
