水稻秸秆在割台螺旋搅龙输送下的流动特性分析  

Analysis of the flow characteristics of rice straw transported by spiral churn on cutting tables

作　　者：张彪 王邦追 王国强 荆天天 唐忠 吴美玲 李亚健 ZHANG Biao;WANG Bangzhui;WANG Guoqiang;JING Tiantian;TANG Zhong;WU Meiling;LI Yajian(College of Agricultural Engineering,Jiangsu University,Zhenjiang,Jiangsu 212013,China;Jiangsu Modern Agricultural and Animal Husbandry Equipment Engineering Technology Research and Development Center,Taizhou,Jiangsu 225300,China)

机构地区：[1]江苏大学农业工程学院,江苏镇江212013 [2]江苏省现代农牧装备工程技术研究开发中心,江苏泰州225300

出　　处：《湖南农业大学学报(自然科学版)》2025年第2期97-102,共6页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：泰州市科技支撑计划(农业)项目(TN202219);2022年度国家农业可持续发展试验示范区建设市级财政专项资金项目(ZK20230001)。

摘　　要：针对水稻秸秆在割台螺旋搅龙输送下的流动规律不明而难以揭示割台磨损现象的问题,笔者分析收获过程中联合收割机割台螺旋搅龙对水稻秸秆接触单元体的输送状态,建立流动速度数学模型,绘制水稻秸秆质心的运动轨迹曲线;采用离散元法模拟收获过程中螺旋搅龙对水稻秸秆的输送效果,得到水稻秸秆质心处的运动轨迹曲线;测绘割台磨损轮廓曲线,并对水稻秸秆的理论运动轨迹曲线和仿真的运动轨迹曲线及割台的磨损轮廓曲线进行对比分析。结果表明:当摩擦因数从0.3下降至0.1时,螺旋叶片外缘带动水稻秸秆的轴向速度从1 058.83 mm/s提升至1 123.59 mm/s,圆周向速度从670.59 mm/s下降至439.40 mm/s。仿真的水稻秸秆运动轨迹曲线和理论水稻秸秆运动轨迹的相似度较高,均方误差为0.3867~6.1883;磨损轮廓曲线与理论轨迹曲线仅在水稻秸秆与螺旋叶片接触后的轴向位移处于0~64 mm时的相似度较高,整体曲线的均方误差为29.637 6。To address the difficulty in revealing the abrasion mechanisms due to the unknown flow pattern of the rice straw transported by the spiral churn of the cutting table,this study investigated the conveying process of rice straw by the combine harvester header auger during harvesting.The behavior of rice straw contact units was analyzed,and a mathematical model of flow velocity was established to plot the trajectory of the straw’s centroid.Discrete element method simulations were employed to model the conveying process,obtaining the centroid trajectory.The wear profile of the header was measured and compared with the theoretical and simulated straw trajectories.The results showed that when the friction coefficient decreased from 0.3 to 0.1,the axial velocity of rice straw driven by the outer edge of the spiral blades increased from 1058.83 mm/s to 1123.59 mm/s,while the circumferential velocity decreased from 670.59 mm/s to 439.40 mm/s.The simulated straw trajectory closely matches the theoretical model,with a mean square error of 0.3867-6.1883.However,the wear profile aligned well with the theoretical trajectory only when the axial displacement of rice straw and spiral blade contact ranged from 0 to 64 mm,with an overall MSE of 29.6376.

关 键 词：水稻秸秆 螺旋搅龙 流动特性 运动轨迹 离散元仿真 

分 类 号：S225.31[农业科学—农业机械化工程]