不同叶片型式旋流泵能量转换机理分析  

Effect of Blade Type on Energy Conversion of Vortex Pump

作　　者：权辉[1,2] 郭英 杨宇娥 蔡婷 陈祥玉 于欣洋 QUAN Hui;GUO Ying;YANG Yu'e;CAI Ting;CHEN Xiangyu;YU Xinyang(College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China;College of Engineering, Nihon University, Fukushima 9638642, Japan)

机构地区：[1]兰州理工大学能源与动力工程学院,兰州730050 [2]日本大学工学院,福岛9638642

出　　处：《农业机械学报》2020年第3期123-129,共7页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金项目(51969014,51609113);中国博士后科学基金项目(2018M633651XB);甘肃省自然科学基金项目(2017GS10829);山东省博士后科学创新基金项目;兰州理工大学红柳优秀青年基金项目。

摘　　要：针对旋流泵内部流动结构形式所引起的整机效率下降问题,以卧式150WX20020型旋流泵为研究对象,进行旋流泵水力和结构设计,运用Pro/E三维设计软件建立前弯型和后弯型两种折叶片三维模型。设计6组前弯和后弯叶片为对照组,采用CFD流体计算软件进行数值计算,以两种折叶片组成叶轮型式为研究对象,结合叶片进出口速度三角形,对旋流泵不同叶轮的做功过程和能量损失过程进行了分析,从而找到两种不同叶轮型式下的能量损失传递转换机理。研究发现,对于旋流泵效率而言,在设计流量点之前,前弯叶轮的效率高于后弯叶轮效率;在设计流量点之后,后弯叶轮效率高于前弯叶轮效率。对于两种不同型式的叶轮,在设计流量点之前,前弯叶片的做功能力更强,能量损失更小;在设计流量点之后,后弯叶片的做功能力更强,能量损失更小。Aiming at the problem that the blade type and energy loss of the vortex pump cause the whole machine efficiency to decline seriously,the model 150WX20020 vortex pump was taken as the research object,and the hydraulic and structural design of the vortex pump was carried out.The three-dimensional models of the forward-curved(R1F2)and the backward-curved(F1R2)blades were established by using Pro/E of three-dimensional design software.In this process,six groups of forward-curved(R1F2)and backward-curved(F1R2)blades were designed as control group.CFD of fluid calculation software was used for numerical calculation.Taking two kinds of blade deflecting as breakthrough point,combined with inlet and outlet velocity triangle of blade,the work process and energy loss process of different impellers of vortex pump were compared and analyzed.The energy loss transfer and transformation mechanism under these two different impeller types can be found.It was found that for the efficiency of vortex pump,the efficiency of forward-curved impeller was higher than that of backward-curved impeller before the design flow point,and after the design flow point,the efficiency of backward-curved impeller was higher than that of forward-curved impeller.For two different types of impellers,before the design flow point,the forward-curved blade had stronger function and less energy loss;after the design flow point,the backward-curved blade had stronger function and less energy loss.It was of great significance to the national agricultural development,and it had a certain reference value for the selection of the blade of vortex pump in the future.

关 键 词：旋流泵 叶片型式 能量损失 能量转换 数值模拟 

分 类 号：TK734[交通运输工程—轮机工程]