文晟,韩杰,兰玉彬,尹选春,卢玉华.单旋翼植保无人机翼尖涡流对雾滴飘移的影响[J].农业机械学报,2018,49(8):127-137,160.
WEN Sheng,HAN Jie,LAN Yubin,YIN Xuanchun,LU Yuhua.Influence of Wing Tip Vortex on Drift of Single Rotor Plant Protection Unmanned Aerial Vehicle[J].Transactions of the Chinese Society for Agricultural Machinery,2018,49(8):127-137,160.
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单旋翼植保无人机翼尖涡流对雾滴飘移的影响   [下载全文]
Influence of Wing Tip Vortex on Drift of Single Rotor Plant Protection Unmanned Aerial Vehicle   [Download Pdf][in English]
投稿时间:2018-03-16  
DOI:10.6041/j.issn.1000-1298.2018.08.015
中文关键词:  单旋翼植保无人机  翼尖涡流  雾滴飘移  数值模拟
基金项目:国家重点研发计划项目(2016YFD0200700)、广东省自然科学基金项目(2017A030310383)、广东省科技计划项目(2016A020210100、2017B010117010)、广东省教育厅重点平台及科研项目(2015KGJHZ007)和广州市科技计划项目(201707010047)
作者单位
文晟 华南农业大学 
韩杰 华南农业大学 
兰玉彬 华南农业大学 
尹选春 华南农业大学 
卢玉华 华南农业大学 
中文摘要:为研究单旋翼植保无人机翼尖涡流对雾滴飘移的影响特性,基于格子玻尔兹曼(Lattice Boltzman, LBM)方法的自适应细化物理模型,对单旋翼无人机的旋翼流场进行了数值模拟。通过改变无人机喷杆的垂直距离和喷头在旋翼下方的位置,研究了不同飞行速度下,无人机翼尖涡流对雾滴飘移的影响规律。为捕获到不同粒径的雾滴在无人机下洗流场中的运动轨迹,采用基于拉格朗日离散相粒子跟踪法模拟了雾滴的运动轨迹。为验证数值模拟的准确性,进行了试验验证,研究结果表明:当无人机飞行速度大于3m/s时,机身后方开始出现螺旋型尾涡,且飞行速度越大、飞行高度越高,尾涡向机身后方的扩散距离越远;当飞行速度为5m/s、飞行高度为3m时,38%的雾滴因螺旋尾涡而造成空中飘移,其中粒径小于100μm的雾滴约占总飘移雾滴数的80%;喷杆距离主旋翼的高度对雾滴因翼尖涡流造成的飘移影响不明显,但喷头的位置越靠近主旋翼的边缘,雾滴越容易被翼尖涡流卷吸。
WEN Sheng  HAN Jie  LAN Yubin  YIN Xuanchun  LU Yuhua
South China Agricultural University,South China Agricultural University,South China Agricultural University,South China Agricultural University and South China Agricultural University
Key Words:single rotor plant protection UAV  wing tip vortex  droplet drift  numerical simulation
Abstract:Plant protection drone has great application prospects in agricultural production due to its low working height, flexible operation, good adaptability to terrain, slight environmental pollution and high efficiency in pest control. However, it could cause secondary disasters with droplets drift due to wingtip vortices. To investigate the effect of wing tip vortex flow of a single-rotor unmanned aerial vehicle on droplet drift, the flow field under a single rotor unmanned aerial vehicle (UAV) was simulated numerically based on an adaptive thinned physical model of the lattice-Boltzman (LBM) method. The drift characteristics at different flight speeds of the wingtip vortex were examined for various nozzle positions and vertical distances between different spray booms. The Lagrange discrete particle tracking method was applied to capture accurately the trajectories of droplets with different particle diameters. Spray tests were conducted to verify the accuracy of the numerical simulation. It was shown that as the UAV flight speed was greater than 3m/s, a spiral tail vortex appeared at the rear of the fuselage. The range of the tail vortex behind the fuselage became longer as the flight speed or flight altitude got higher. And 38% of the droplets was drifted by the spiral tail vortex at the flight speed of 5m/s and the flight height of 3m, in which 80% of the drifted droplets was smaller than 100μm. The distance between the sprayer and the main rotor had little effect on the drop drift caused by the wingtip vortex. While the nozzle was closer to the edge of the main rotor, the droplets can be more easily sucked by the wingtip vortex.

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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