Discharge rate consistency of each channel for UAV-based pneumatic granular fertilizer spreader  

作　　者：Xunwei Wang Rui Jiang Zhiyan Zhou Cancan Song Xiwen Luo Ruifeng Bao Zichen Lyu Junhao Huang Jianqin Lin 

机构地区：[1]College of Engineering,South China Agricultural University and Guangdong Laboratory for Lingnan Modern Agriculture,Guangzhou 510642,China [2]Guangdong Provincial Key Laboratory of Agricultural Artificial Intelligence(GDKL-AAI),Guangzhou 510642,China [3]Guangdong Engineering Research Center for Agricultural Aviation Application(ERCAAA),Guangzhou 510642,China [4]Key Laboratory of Key Technology on Agricultural Machine and Equipment(South China Agricultural University),Ministry of Education,Guangzhou 510642,China [5]College of Agricultural Engineering and Food Science,Shandong University of Technology,Zibo 255000,China

出　　处：《International Journal of Agricultural and Biological Engineering》2023年第4期20-28,共9页国际农业与生物工程学报（英文）

基　　金：supported by the Laboratory of Lingnan Modern Agriculture Project(Grant No.NT2021009);the Project of key R&D program of Guangzhou of China(Grant No.202206010149);in part by Science and Technology Plan of Jian City of China(Grant No.20211-055316 and[2020]83);Science and Technology Plan of Guangdong Province of China(2023B10564002 and 2021B 1212040009);Innovative Research Team of Agricultural and Rural Big Data in Guangdong Province of China(2019KJ138)。

摘　　要：Unmanned aerial vehicles(UAVs)are widely being used to spread granular fertilizer in China.Granular fertilizer spreaders equipped with UAVs are mainly centrifugal disc-type and pneumatic.The multichannel pneumatic granular fertilizer spreaders(MPGFSs)have a banded fertilizer deposition distribution pattern,which are more suitable for variable rate fertilization with high precision requirement than the circular deposition distribution pattern of disc-type granular fertilizer spreaders(DGFSs).However,the existing MPGFS has the disadvantage of inconsistent discharge rate of each channel,which affects the uniformity of fertilization.In order to explore the causes of inconsistent discharge rate of each channel,the discrete element method(DEM)and bench test were performed to analysis the discharge process of the fluted roller fertilizing apparatus and distribution of fertilizer in axial direction of fluted roller.The computational fluid dynamics(CFD)was used to simulate the airflow field of pneumatic system to analyze the influence of airflow on the movement of fertilizer particles.The simulation results of the discharge process of the fluted roller fertilizing apparatus showed that the filling velocity at the axial ends of the fluted roller fertilizing apparatus was lower than that of the middle.The reason was that the filling capacity was weak near the wall.The simulated results of the airflow field without partitions showed that the airflow provided by the axial flow fan was rotational,and this caused the particles to move irregularly in the throat,resulting in inconsistency discharge rate of each channel.Based on the analysis of reasons of inconsistent discharge rate of each channel,a MPGFS with partitions in the throat was developed.The discharge rate bench tests were carried out to optimize the partition spacing parameters,and fertilization test was performed to test the performance of the improved MPGFS.The discharge rate test results showed better consistency with partition.The coefficient of variation(CV)of th

关 键 词：UAV discharge rate fertilizer spreader DEM CFD 

分 类 号：S143[农业科学—肥料学]