李继宇,郭爽,姚伟祥,展义龙,李一凡.气流作业下雾滴粒径稻株间分布特性与风洞模拟试验[J].农业机械学报,2019,50(8):148-156.
LI Jiyu,GUO Shuang,YAO Weixiang,ZHAN Yilong,LI Yifan.Distribution Characteristics of Droplet Size in Rice Field and Wind Tunnel Simulation Test under Airflow Operation[J].Transactions of the Chinese Society for Agricultural Machinery,2019,50(8):148-156.
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气流作业下雾滴粒径稻株间分布特性与风洞模拟试验   [下载全文]
Distribution Characteristics of Droplet Size in Rice Field and Wind Tunnel Simulation Test under Airflow Operation   [Download Pdf][in English]
投稿时间:2019-05-15  
DOI:10.6041/j.issn.1000-1298.2019.08.017
中文关键词:  雾滴粒径分布  风洞  无人机  涡旋形态  对靶喷施  气流作业
基金项目:国家自然科学基金项目(31771682)和高等学校学科创新引智计划项目(D18019)
作者单位
李继宇 华南农业大学 
郭爽 华南农业大学 
姚伟祥 华南农业大学 
展义龙 华南农业大学 
李一凡 华南农业大学 
中文摘要:为探究气流涡旋作业方式对航空喷施雾滴粒径分布的影响,以XR-Teejet 110015型压力式扇形航空喷头为研究对象,在风洞和田间环境中进行了雾滴粒径测试试验。风洞测试模拟田间环境风速设置气流速度,同时设置了3种喷施压力,使用激光粒度分析仪测量雾滴粒径。田间试验以四旋翼无人机为施药载体,对杂交水稻进行精准对靶喷施,并对各架次无人机旋翼气流与冠层互作程度不同所形成的涡旋形态对应的雾滴粒径分布特性进行了分析。结果表明:风洞条件下,各测试喷头均处于非常细的雾化等级,雾化性能良好且稳定;田间试验中,涡旋形态对雾滴粒径分布影响显著;3种涡旋形态下,小于200μm的雾滴粒径综合平均占比分别为73.52%、74.21%和84.20%,与风洞测试结果较为一致,但田间试验所得雾滴粒径值明显偏高;明显的涡旋形态与小范围涡旋形态雾滴粒径在作物各层位分布趋势较为平缓,各层雾滴体积中径变异系数均处于3.96%~10.66%之间,无涡旋形态各层雾滴粒径分布则体现较大的波动性,变异系数也较高,处于9.49%~17.11%之间,说明较为明显的涡旋形态有助于雾滴在作物冠层垂直空间的穿透,达到更好的施药效果。研究结果可为农用无人机田间精准喷施作业提供参考。
LI Jiyu  GUO Shuang  YAO Weixiang  ZHAN Yilong  LI Yifan
South China Agricultural University,South China Agricultural University,South China Agricultural University,South China Agricultural University and South China Agricultural University
Key Words:droplet size distribution  wind tunnel  UAV  vortex state  target spray  airflow operation
Abstract:In order to investigate the effect of airflow vortex operation on the droplets size distribution of aerial spray, the XR-Teejet 110015 pressure fan shaped nozzle was used as an example, and was tested in the wind tunnel and field respectively. The wind speed in the field was simulated by the airflow velocity of the wind tunnel test, and three spray pressures were set, the droplet size were measured by the laser particle size analyzer. In the field experiment, a four rotor unmanned aerial vehicle (UAV) was used as the platform to spray on target, then the droplet size distribution regular of each vortex shape formed by different interaction between rotor airflow and canopy were analyzed. The results showed that under the conditions of wind tunnel, each test nozzle was in a very fine atomization level, and the atomization performance was well and stable. The formation of vortex state had a significant effect on the droplets size distribution in the field test. Under the three vortex states, the comprehensive average proportion of droplet size less than 200μm was 73.52%, 74.21% and 84.20%, respectively, which was consistent with the wind tunnel test results, but the DV01, DV05 and DV09 of the droplet in the field test were significantly higher than that in the wind tunnel test. The droplets size of the obvious vortex state and small range vortex had a relatively flat distribution trend in the various layers of the crop, and the variation coefficient of volume median diameter in each layer was between 3.96% and 10.66%, but the no vortex state showed a large volatility, and the coefficient of variation was in the range of 9.49%~17.11%, which indicated that the relatively obvious vortex state was conducive to the penetration of droplets in the vertical space and achieved better application effect. The research results can provide reference and guidance for the accurate spraying operation of agricultural UAV, and have important significance for improving the utilization rate of pesticides in aerial spraying operations.

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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