施肥泵活塞关键结构参数对性能影响的数值模拟  

Numerical simulation of effects of piston key structural parameters on performance of jet fertilizer pump

作　　者：王新坤[1] 夏立平[1] 高世凯[1] 许鹏[1] 

机构地区：[1]江苏大学流体机械工程技术研究中心,江苏镇江212013

出　　处：《排灌机械工程学报》2014年第1期66-71,共6页Journal of Drainage and Irrigation Machinery Engineering

基　　金：国家863计划项目(2011AA100506);农业科技成果转化资金资助项目(2011GB2C100015)

摘　　要：针对现有的活塞式施肥泵存在的性能不高等问题,设计出一种新型射流施肥泵.利用Pro/E软件完成射流施肥泵的造型,运用Fluent软件进行数值模拟.以活塞关键结构参数和射流泵入口压力为因素,以活塞平均运动速度和切换频率为试验指标,对射流施肥泵进行了四因素四水平正交试验设计,得到活塞的平均运动速度和切换频率,通过活塞注肥进程典型时刻的速度云图分析了内部流场分布与活塞动态过程.并应用极差与方差分析法对活塞平均运动速度和切换频率的主要影响因素进行了分析.结果表明:入口压力和活塞冲程对活塞平均运动速度和切换频率的影响均具有统计学意义.利用多元回归方法拟合出活塞平均运动速度、切换频率与结构参数的关系式,关系式具有较高的线性相关性.建立了活塞平均运动速度和切换频率与活塞关键结构参数之间的回归模型,可为射流施肥泵结构设计与量化分析提供参考.According to the problems in the existing jet fertilizer pumps,a new type of the pump was proposed and its 3D solid model was generated in Pro / E software,the flow in it was simulated by using CFD software-Fluent. An orthogonal experimental design with 4 factors each at 4 levels was applied in the new fertilizer pump,the 4 factors include 3 key structural parameters of the piston and driving pressure for the pump,and the observed performance indexes are the averaged piston moving velocity and switching frequency. The internal flow field and piston moving process were analyzed by means of velocity contours at a series of typical instances during the discharging period of the piston. The effects of those parameters on the two observed indexes were evaluated by using the range analysis and variance analysis. The results show that the driving pressure and piston stroke can significantly affect the averaged piston moving velocity and switching frequency. The averaged piston moving velocity and switching frequency have been correlated to those four parameters with a stronger linear dependence by using the multivariable method. These linear multivariable regression models can provide a theoretical basis for the structural design and quantitative analysis in the design of jet fertilization pumps.

关 键 词：施肥泵 活塞 正交试验 数值模拟 多元回归方法 

分 类 号：S224.2[农业科学—农业机械化工程]