叶片轴向进气的离心叶轮设计及分析  

Design and Analysis of a Centrifugal Impeller with Blade Leading Edge Located at the Impeller Eye

作　　者：耿文倩[1] 但汉攀 陈聪聪[1] 李景银[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049 [2]杭州汽轮机股份有限公司,杭州310012

出　　处：《动力工程学报》2016年第2期113-117,共5页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51276137)

摘　　要：研究了位于叶轮0截面叶片轴向进气的离心叶轮气动设计方法和规律.采用四阶三次Bezier曲线生成叶轮子午流道型线,通过分段多项式函数给定叶片在轮盘和轮盖面上的角动量,并针对叶片轴向进气离心叶轮,提出了叶轮进口相对直径的修正公式,研究了其叶片安装角的分布规律.结果表明:轴向进气叶轮叶片安装角分布规律与径向进气叶轮的叶片安装角不同,其叶片安装角基本按单调方式增加;由叶轮进口相对直径修正公式计算后,在工况范围内的全压多变效率可以提高5%左右.The design of an impeller with axial admission of air flows, i. e. , the impeller with blade leading edge located at the impeller eye, was presented and discussed. First, the cubic Bezier curve was applied to design the meridional flow channel. Then, the distribution of the angular momentum on surfaces of the shroud and hub was prescribed by using a piecewise polynomial function. Finally, modified formulas for the optimum ratio of D1/D2 （D0 =D1 ） were proposed via numerical simulations for the impeller with blade leading edge at the impeller eye, and simultaneously the blade angle was analyzed. Results show that the blade angel on the shroud surface shows a monotonic increasing tendency for the impeller with axial admis- sion of air flows, different from that with radial admission of air flows. By calculation with above modified formulas to optimize the ratio of D1/D2, the whole-pressure polytropic efficiency can be improved by 5 within the scope of working conditions.

关 键 词：离心叶轮 叶片轴向进气 叶轮进口相对直径 叶片安装角 

分 类 号：TK16[动力工程及工程热物理—热能工程]