代祥,徐幼林,宋海潮,陈骏阳,况良杰,马鲁强.混药器混合均匀性分析方法与在线混合变工况试验[J].农业机械学报,2018,49(10):172-179.
DAI Xiang,XU Youlin,SONG Haichao,CHEN Junyang,KUANG Liangjie,MA Luqiang.Mixing Uniformity Analysis Methods and In-line Mixing Experiments of Mixer under Variable Working Conditions[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(10):172-179.
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混药器混合均匀性分析方法与在线混合变工况试验   [下载全文]
Mixing Uniformity Analysis Methods and In-line Mixing Experiments of Mixer under Variable Working Conditions   [Download Pdf][in English]
投稿时间:2018-04-18  
DOI:10.6041/j.issn.1000-1298.2018.10.019
中文关键词:  旋动射流混药器  像素变异系数  面积加权均匀性指数  变工况  混合均匀性
基金项目:江苏省基础研究计划青年基金项目(BK20170930)、国家林业局948项目(2015-4-56)、江苏高校“青蓝工程”项目和江苏省“333”高层次人才培养工程项目
作者单位
代祥 南京林业大学 
徐幼林 南京林业大学 
宋海潮 南京林业大学
南京工业职业技术学院 
陈骏阳 南京林业大学 
况良杰 南京林业大学 
马鲁强 南京林业大学 
中文摘要:直接注入式变量喷雾系统中药水混合均匀性是衡量系统性能的重要指标。为了评价混药器在线混合农药的能力,提出了混药器混合均匀性分析方法,并进行了旋动射流混合装置混合脂溶性农药的变工况(不同载流流量Q以及不同药水混合比P)在线混合试验。以基于像素的变异系数α和均匀性指数γ作为均匀性评价指标,对混药器的药水混合图像进行处理,定量分析混合均匀性。采用人工预混的方法,通过和无混药器混合图像及静置图像进行对比,验证了评价指标的准确性。变工况试验结果表明:旋动射流混药器混合脂溶性农药时,在混合比P一定的条件下,载流流量Q越大,则混合均匀性越高;不同P条件下,均在Q=2400mL/min(试验条件下最大载流流量)时混合均匀性达最高,Q过小,会造成混合均匀性明显下降;Q一定时,P越大,则混合均匀性越高,P较低时,需要有较高的Q才能取得良好的混合均匀性。综合分析知:2000mL/min≤Q≤2400mL/min时,可以完成不同混合比P下的药水均匀混合;800mL/min<Q<2000mL/min时,可完成较高混合比P下的在线均匀混合;Q≤800mL/min时,基本无法完成各种混合比P下的在线均匀混合。
DAI Xiang  XU Youlin  SONG Haichao  CHEN Junyang  KUANG Liangjie  MA Luqiang
Nanjing Forestry University,Nanjing Forestry University,Nanjing Forestry University;Nanjing Institute of Industry Technology,Nanjing Forestry University,Nanjing Forestry University and Nanjing Forestry University
Key Words:swirling jet mixer  variation coefficient of pixel  area-weighted uniformity index  variable working conditions  mixing uniformity
Abstract:The high mixing uniformity for pesticides and carrier water was an important requirement in direct nozzle injection system (DNIS) used to alleviate the waste of pesticides and protect environment from being contaminated by pesticides residues. To evaluate the mixing effects of pesticides mixers, new analysis methods for mixing uniformity were presented and the swirling jet mixer was used to carry out the experiments of in-line mixing for the water and non-water soluble pesticides under variable working conditions. Quantitative descriptions for mixing uniformity of mixture inside the mixer were achieved based on calculating the coefficient of variation(α) and area weighted uniformity index (γ) for the regions of interest(ROI) in the mixture images of the mixer. The accuracy of the analysis methods was verified by comparing the images of artificial premixed mixture and the images of unmixed mixture, as well as the images of mixture in standing state, and it proved that the indexes could be taken as criteria to judge whether the mixers could meet the requirements for in-line mixing or not. The experiments result under variable working conditions revealed that the mixing uniformity was increased with higher carrier flow rate and the flow rate of 2400mL/min gave rise to the best uniformity while the uniformity was declined heavily with lower flow rate under the conditions of settled mixing ratios. When the carrier flow rate was remained unchanged, higher mixing ratios would contribute to higher uniformity. Therefore, it was necessary to provide high flow rate to ensure good mixing uniformity when it came to lower mixing ratios. Normally, The criteria of α=0.2239 and γ=80.39% were set to be the thresholds for uniform mixtures and non-uniform mixtures as there were no non-scatted pesticides remaining in the mixer when the indexes were better than them. Moreover, the filtering results showed that the flow rate which was higher than 2000mL/min could meet the uniformity requirements at different mixing ratios while the flow rate of 800mL/min could not meet the uniformity requirements at any mixing ratios, and the mixing uniformity at part of these ratios could be satisfied when the flow rates were between 800mL/min and 2000mL/min.

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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