生物炭基肥离散元模型参数标定与试验  

Calibration and Testing of Discrete Element Model Parameters for Biochar-based Fertilizer

作　　者：任德志 张露籍 宫元娟[2] 孟军[1] 赫天一 REN De-zhia;ZHANG Lu-jib;GONG Yuan-juanb;MENG Juna;HE Tian-yia(Coege of Agronomy/National Biochar Institute/Key Laboratory of Biochar and Soil Ameioration,Ministry of Agriculture and Rural Affairs,Shenyang Agricultural University,Shenyang 110161,China;College of Engineering,Shenyang Agricultural University,Shenyang 110161,China)

机构地区：[1]沈阳农业大学农学院/国家生物炭研究院/农业农村部生物炭与土壤改良重点实验室,沈阳110161 [2]沈阳农业大学工程学院,沈阳110161

出　　处：《沈阳农业大学学报》2023年第4期447-455,共9页Journal of Shenyang Agricultural University

基　　金：辽宁省教育厅重点项目(LSNZD201707);现代农业产业技术体系建设专项项目(CARS-01-51);辽宁省科学技术计划项目(2021-MS-232);国家自然科学基金项目(31901449)。

摘　　要：生物炭基肥料是近年来新兴的一种农业投入品,然而生物炭基肥料还田施用的机械化程度尚属较低水平。为促进生物炭基肥料机械化还田的理论和实践发展,寻求最优生物炭基肥离散元模型接触参数组合,指导生物炭及炭基肥料还田机械的设计和试制,提出了一种真实试验与仿真试验结合的方法,对生物炭基肥颗粒数学模型开展研究,验证数值方法的适用性和准确性。以生物炭颗粒堆积角的实际测量值为目标值,通过物料特性研究了创建法向力、切向力和附着力接触模型,利用离散元仿真软件ESSS Rocky DEM对生物炭基肥颗粒离散元参数进行标定,设计Placket-Burman试验获取对堆积角有显著影响的参数,通过最陡爬坡试验得到显著因素参数区间,最后通过Box-Behnken试验优化参数组合。结果表明:生物炭基肥料颗粒粒径占比2mm为35%,3 mm颗粒占比为42%,4 mm颗粒占比为23%,颗粒平均含水率为5%,测得炭颗粒堆积角实际值为23.65°;对炭基肥颗粒接触参数有显著影响的因素为炭—炭滚动摩擦系数、炭颗粒表面能JKR以及炭—钢滚动摩擦系数,最优化参数组合为炭—炭滚动摩擦系数0.36、炭颗粒表面能0.30、炭-钢滚动摩擦系数0.20,仿真堆积角试验值与真实试验值的平均相对误差仅为0.72%,验证了仿真参数及试验的可行性和适用性。研究结果为生物炭基肥料离散元模型参数选取提供了新的参考。Biochar-based fertilizer is an emerging agricultural input in recent years,however,the mechanization of biochar-based fertilizer return to the field application is still at a low level.In order to promote the theoretical and practical development of mechanized biochar-based fertilizer field return,and to seek the optimal contact parameters combination of biochar-based fertilizer discrete element model to guide the design and trial production of biochar-and carbon-based fertilizer field return machinery;a method combining real tests and simulation tests is proposed to carry out research on the mathematical model of biochar-based fertilizer particles and to verify the applicability and accuracy of the numerical method.The actual measured values of biochar pellet repose angle were used as the target value,and the material characteristics were studied to create the normal force,tangential force and adhesion force contact models,and the discrete element parameters of biochar-based fertilizer pellets were calibrated using the discrete element simulation software ESSS Rocky DEM.The Placket Burman experiment was designed to obtain significant factors on repose angle,the ranges of significant factors were obtained through the steepest climbing experiment,and finally the parameter combinations were optimized by the Box-Behnken test.The results showed that:the proportions of particle size of biochar-based fertilizer were 35% of 2 mm,42% of 3 mm,23% of 4 mm,and the average moisture content of the particles was 5%,and the actual value of the repose angle of biochar particles was 23.65 °.The factors that significantly influenced the contact parameters of biocharbased fertilizer particles were:biochar-biochar rolling friction coefficient,biochar particle surface energy JKR,and biochar-steel rolling friction coefficient.The optimized parameters were:biochar-biochar rolling friction coefficient of 0.36,biochar particle surface energy of 0.30,and biochar-steel rolling friction coefficient of 0.20.The average relative error betwee

关 键 词：生物炭基肥 Rocky 离散元模型 参数标定 

分 类 号：S3[农业科学—农艺学]