射流喷嘴几何参数对喷灌泵自吸性能的影响  

Effects of geometric parameters for jet nozzle on self-priming performance of spray pump

作　　者：刘建瑞[1,2] 文海罡[1,2] 高振军[1,2] 郭晨旭[1,2] 王鹏[1,2] 

机构地区：[1]江苏大学流体机械工程技术研究中心,镇江212013 [2]国家水泵及系统工程技术研究中心,镇江212013

出　　处：《农业工程学报》2012年第24期47-54,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家"863"高技术研究发展计划资助项目(2011AA100506);农业科技成果转化资金项目(2011GB2C100015)

摘　　要：为探索射流喷嘴几何参数对射流式自吸喷灌泵自吸性能的影响规律,该文选择射流喷嘴的喷管总长L1、喷管角度θ、出口长度L2及出口直径D2为变化因素,按L9(34)正交试验的方法设计了9种不同参数的射流喷嘴,通过数值模拟得到使用9种不同射流喷嘴的泵自吸过程气液两相体积流率、叶轮进口速度、叶轮进口气相体积分布及叶轮气相体积分布规律。分析结果表明:射流喷嘴几何参数对射流式自吸喷灌泵气相及液相流率影响的主次顺序为D2>L2>L1>θ;对叶轮进口速度影响的主次顺序为L2>θ>D2>L1;对叶轮进口气相体积分布影响的主次顺序为θ>L1>D2>L2;对叶轮气相体积分布影响的主次顺序为D2>θ>L1>L2;对该射流式自吸喷灌泵射流喷嘴各几何参数最佳组合为射流喷嘴的喷管总长L1=55mm、喷管角度θ=42°、出口长度L2=2mm及出口直径D2=13mm。研究结果可为射流式自吸离心泵射流喷嘴的设计提供参考。In order to explore the effect laws of jet nozzle geometric parameters on self-priming performance of flow-ejecting self-priming spray, the jet nozzle geometric parameters including total length L1, nozzle angle 0, outlet length L2 and outlet diameter D2 were designed as changed factors, and 9 kinds of different jet nozzles were developed. The rules of two gas and liquid phase flow rate of the pump, impeller inlet velocity, gas phase volume distribution of outlet and internal gas phase volume distribution of the impellers for 9 kinds of different jet nozzle geometric parameters during the self-priming process were obtained by numerical simulation based on L9（34） orthogonal test. The analysis results showed that the order of the jet nozzle geometric parameters affecting the two gas and liquid phase flow rate of the pump was D2〉L2〉L1〉θ, and the order of the jet nozzle geometric parameters affecting the impeller inlet velocity was L2〉θ〉D2〉L1, the order of the jet nozzle geometric parameters affecting the gas phase volume distribution of impeller inlet was θ〉L1〉D2〉L2, the order of the jet nozzle geometric parameters affecting the gas phase volume distribution of the impeller was D2〉θ〉LI〉L2. Optimization results showed that the best combination of the jet nozzle geometric parameters was as follows： total length L1=55 mm, nozzle angle θ=42°, outlet length L2=2 mm and outlet diameterD2= 13 mm. The study provides a reference for the design of flow-ejecting self-priming spray pumps.

关 键 词：农业机械 数值模拟 泵 射流喷嘴 几何参数 自吸性能 

分 类 号：TH311[机械工程—机械制造及自动化]