关键词：
泵;叶轮;设计;多工况设计;试验设计;数值模拟;自吸泵
摘 要：
为了使自吸泵能够同时满足喷灌系统在流量12 m3/h、扬程30 m、滴灌系统在流量18 m3/h、扬程20 m时2个工况点的设计要求,该文采用试验设计(design of experiment,DOE)和数值模拟相结合的方法,对1台50ZB-30C自吸泵的叶轮进行多工况设计改进。重点分析了叶轮几何参数对泵扬程的影响规律,建立了不同工况点的扬程与叶轮主要几何参数之间的回归方程,并对该方程的参数进行赋值计算,得到满足设计要求的叶轮几何参数值。样机试验结果表明:安装了新叶轮的喷滴灌两用自吸泵在流量为12 m3/h时扬程达30.3 m,流量为18 m3/h时扬程达21 m,达到了设计要求。证明通过DOE方法能够建立数学模型来描述不同工况点的扬程与叶轮几何参数之间的关系。随着叶片包角的增大和叶片出口安放角的减小,扬程曲线会更加陡峭。研究为泵的多工况设计提供参考。
译 名：
Design of sprinkler-drip dual-purpose self-priming pump based on design of experiment
作 者：
Li Hong;Yang Xingbiao;Li Lei;Chen Chao;Research Center of Fluid Machinery Engineering and Technology, Jiangsu University;
关键词：
pumps;;impellers;;design;;multi-point design;;design of experiment;;numerical simulation;;self-priming pump
摘 要：
Agricultural self-priming pump is widely used in sprinkler irrigation and drip irrigation system. But, the self-priming pump that could be used for sprinkler and drip dual-purpose irrigation system is lacking. Common centrifugal pump design method is used for a single point design only and not for multi-objective optimization design. At present,many design methods can be for multi-operation condition. These methods have made a certain progress in solving specific problems, but have some shortcomings such as causing big error between measured and real value. Design of experiment(DOE) is a statistic method for experiment arrangement and data analysis. It has been used for multi-objective optimization design in pump optimization design. The objective of this study was to design a self-priming pump that could be used for sprinkler and drip dual-purpose irrigation system based on DOE and numerical design. As such,the pump was expected to meet with the requirements of two operation conditions, the discharge 12 m3/h and the head 30 m for the sprinkler irrigation and the discharge 18 m3/h and the head 20 m for drip irrigation. The DOE design method was employed in the multi-point design of impeller for the self-priming pumps 50ZB-30C. Numerical simulation was conducted in the environment of computational fluid dynamics(CFX) with speed inlet and free flow outlet. The k-epsilon model was used as turbulence model and the calculation was based on the SIMPLEC algorithm. No slip wall boundary condition was used at the boundary layer. The boundary layer roughness was 25 μm and 0.02 s was chosen for physical time scale. The largest number of iterations was 1000. The influence of impeller geometric parameters on the head was analyzed so that the regression equations between them at different operation points were established. With proper variables in the regression equations, the geometric parameters of impeller could then be calculated for specific design requirements. The experiment on the newly designed self-priming pump showed that the discharge and the head was 12 m3/h and 30.3 m for the sprinkler irrigation, and 18 m3/h and 21 m for drip irrigation, meeting the design requirements. The results indicated that the mathematic models established by DOE could be used to describe the relationship between the head and corresponding impeller geometric parameters at different operation conditions. The head curve became steeper as the blade angle and the blade outlet angle decreased.
