宋海潮,徐幼林,郑加强,Zhu Heping.脂溶性农药旋动射流混合机理与混药器流场数值模拟[J].农业机械学报,2016,47(9):79-84.
Song Haichao,Xu Youlin,Zheng Jiaqiang,Zhu Heping.Swirling Jet Mixture Mechanism of Fat-soluble Pesticides and Numerical Simulation of Mixer Field[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(9):79-84.
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脂溶性农药旋动射流混合机理与混药器流场数值模拟   [下载全文]
Swirling Jet Mixture Mechanism of Fat-soluble Pesticides and Numerical Simulation of Mixer Field   [Download Pdf][in English]
投稿时间:2016-02-18  
DOI:10.6041/j.issn.1000-1298.2016.09.012
中文关键词:  脂溶性农药  旋动射流  混药器  混合均匀性  容积分数分布均匀指数
基金项目:江苏省农机三新工程项目(NJ2014-11)、江苏省农业科技支撑计划项目(BE2012383)、江苏高校优势学科建设工程项目(PAPD)、2013年度江苏高校优秀科技创新团队项目(苏教科(2013)10号)、高校研究生科研创新计划项目(KYLX_0868)、江苏省高等职业院校国内高级访问学者计划项目(2015FX037)和江苏省333高层次人才培养工程项目
作者单位
宋海潮 南京林业大学
南京工业职业技术学院 
徐幼林 南京林业大学 
郑加强 南京林业大学 
Zhu Heping 美国农业部应用技术研究所 
中文摘要:以研究脂溶性农药和水的混合均匀性为目的,试验验证了传统射流混药器结构对脂溶性农药在线混合的局限,提出旋动射流混合机理以增加工作液和混合液的旋度,根据该机理设计的旋动射流混药器采用螺旋弯曲收缩管、起旋器和在扩散管中加入固定导叶等方式,增加工作液的卷吸能力、掺混作用。经过数值仿真,采用容积分数分布均匀性评判指标来判断混合效果,结果表明,喷嘴出口处面积加权平均均匀性指数γa为0.9989,截面上药液容积分数最大值与最小值的差值很小,整个截面上的药液分布一致,旋动射流混药器结构设计能够保证出口位置处脂溶性农药与水的均匀混合。
Song Haichao  Xu Youlin  Zheng Jiaqiang  Zhu Heping
Nanjing Forestry University,Nanjing Forestry University,Nanjing Forestry University and USDA ARS ATRU
Key Words:Fat-soluble pesticide  swirling jet  mixer  mixture uniformity  volume fraction uniformity index
Abstract:To characterize jet mixture profiles for in line injection of pesticides, two phase flow fields in conventional mixing chambers were investigated under various test conditions. The two phase flow was formed with water mixed with either a water soluble liquid or a fat soluble liquid (silicon oil). Test results illustrated that there were limitations for the conventional mixers to obtain uniform mixtures with the fat soluble pesticide. To overcome these limitations, a new mixing device based on the swirling jet mechanism was conceived and developed to improve the mixture uniformity of water and the fat soluble pesticide. The swirling jet mixer consisted of a spiral curved shrink tube, a diffuser and a guide vane to accelerate the two phase flow spiral movement and blend the two liquids. A computational fluid dynamics program (Fluent) was used to simulate the flow field inside the swirling jet mixer to optimize its design. The mixture uniformity was evaluated by introducing the uniformity index γa, representing that the two liquids were blended homogenously as γa was 1. Simulated results showed that the γa was 0.9989 across the entire cross sections inside the mixer, confirming uniform mixture profiles with the new mixer design. 〖JP3〗Therefore, the new swirling jet mixer would solve the non uniform mixture problem associated with conventional mixers and could significantly improve the in line injection technology to reduce pesticide waste.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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