基于水力损失计算的离心泵叶轮叶片出口安放角选择方法  

Method for Selecting Centrifugal Pump Impeller Outlet Angle Based on Calculation of Centrifugal Pump Impeller's Hydraulic Loss

作　　者：杨军虎[1] 边中[1] 钟春林[1] 李吉成[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：《西华大学学报（自然科学版）》2016年第3期89-92,112,共5页Journal of Xihua University:Natural Science Edition

基　　金：国家科技支撑计划课题(2013BAF01B02)

摘　　要：为提高离心泵的效率,在泵叶轮内水力损失计算的基础上,通过推导建立叶轮水力效率和流量、转速、叶片数、比转速、出口安放角及叶轮设计系数的函数关系。据此关系,针对一台Q=100 m^3/h、H=34 m、n=2 900r/min的泵,编写性能预测程序,得出不同叶片数、不同k0取值下的叶片出口安放角和水力效率的关系,可知当叶片数Z=5、β_2=29°、k_0=4.2时,叶轮水力效率最高。按设计参数设计叶轮,并构建叶轮和蜗壳模型,利用FULENT软件对其内部流场进行数值模拟,得出在设计参数下泵的水力效率达到89.43%,证明了用所提出的方法可以设计出高效的离心泵叶轮。At present,during the process of the design of centrifugal pump impeller,blade outlet angle has a larger range of selection. However,the outlet angle has great influence on the efficiency of the centrifugal pump. In order to improve the efficiency of the centrifugal pump,we established the function relationship among the flow rate,rotational speed,leaf number,specific speed,outlet angle,impeller design parameters and the efficiency of hydraulic which based on the pump impeller hydraulic loss. We built the performance prediction program for the pump which Q is 100 m^3/ h,H is 34 m,n is 2 900 r / min and mapped the relationship between blade outlet angle and the efficiency of hydraulic diagram. The graph shows that the Impeller hydraulic efficiency is highest,when the number of blades is 5,β_2is 29°,and k_0 is 4. 2. In order to ensure the correctness of this method,we designed the impeller according to the design parameters and use FULENT software to predict the numerical simulation of the internal flow field. The result shows that the impeller＇s efficiency can reach 89%,which proves that this method can be used to design high efficiency centrifugal pump impeller.

关 键 词：叶轮 水力损失 出口角 效率 速度系数 

分 类 号：TH311[机械工程—机械制造及自动化]