叶片型线及厚度变化规律对离心泵性能的影响  

Influence of variation of blade thickness and profile on centrifugal pump performance

作　　者：杨军虎[1] 张建华[1] 孙庆冲[1] 王晓晖[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》2011年第5期50-55,共6页Journal of Lanzhou University of Technology

基　　金：国家自然科学基金(51196010)

摘　　要：以ZA150-315石油化工离心泵为研究对象,在离心叶轮基本外尺寸和设计转速相同的情况下,以3种不同厚度变化规律的叶片构造C1、C2、C3叶轮,运用FLUENT数值模拟软件,在5种不同工况下分别进行数值模拟计算,得到叶轮流道内部压力和速度分布.数值计算结果表明:在任意工况下叶轮C2的效率比C1、C3的效率都高,且在设计工况下叶轮C2的最高效率比叶轮C1、C3的效率高0.6%、1.02%;3种离心叶轮出口处均存在射流尾迹结构,叶轮C1出口处射流-尾迹结构强度最小,叶轮C2次之,叶轮C3最大.研究表明:叶轮出口处射流-尾迹结构强度随叶片出口厚度的增大而增强;不同流量工况射流-尾迹结构强度也不一样,越偏离设计工况射流-尾迹现象越严重.适当优化叶片出口边的形状可以有效地提高泵的效率和减弱射流-尾迹结构,改善叶轮出口的流动性能.Taking ZA150-315 petrochemical centrifugal pump as investigation object,three kinds of its impellers C1,C2 and C3 with three different blade thickness variation pattern were constructed when the basic exterior parameters and rotational speed of centrifugal impeller were fixed. The velocity and pressure distribution of centrifugal impeller inner flow were obtained by using numerical simulation for 5 different operational conditions,respectively.Analysis of simulated results demonstrated that the efficiency of impeller C2 was higher than that of the impellers C1 and C3 at any operation conditions and the maximal efficiency of impeller C2 was higher than that of the impellers C1 and C3 respectively by 0.6% and 1.2%.These three centrifugal impellers all had a ＂jet-wake＂ structure at the impeller outlet.The ＂jet-wake＂ structure intensity of impeller C1 was the smallest,the impeller C2 was the next and the impeller C3 was the largest.The research showed that the ＂jet-wake＂ structure intensity at the impeller outlet would be stronger with the increase of blade outlet thickness.Different flow conditions would result in different ＂jet-wake＂ structure： the more the deviation from the design operational conditions,the more serious the phenomenon of ＂jet-wake＂ structure would be.Proper optimization of the blade outlet geometry could effectively improve the pump efficiency,weaken the ＂jet-wake＂ structure of and improve the flow performance at the impeller outlet.

关 键 词：离心泵 叶片厚度分布 CFD 射流-尾迹结构 水力性能 

分 类 号：TH311[机械工程—机械制造及自动化]