基于Fluent-EDEM的茶叶红外杀青机优化与试验研究  

Optimization and experiment of tea infrared de-enzyme machine based on Fluent-EDEM

作　　者：刘刚 熊爱华[1] 吴瑞梅[1] 虞文俊 黄俊仕 滕杰 张贤溪 杨代勤 LIU Gang;XIONG Ai-hua;WU Rui-mei;YU Wen-jun;HUANG Jun-shi;TENG Jie;ZHANG Xian-xi;YANG Dai-qin(College of Engineering,Jiangxi Agricultural University,Nanchang 330045,China;College of Agronomy,Jiangxi Agricultural University,Nanchang 330045,China)

机构地区：[1]江西农业大学工学院,江西南昌330045 [2]江西农业大学农学院,江西南昌330045

出　　处：《机电工程》2022年第10期1448-1455,共8页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(31460315);江西省重点研发计划项目(2017ACF6004);江西省教育厅科技重点项目(GJJ200402)。

摘　　要：对杀青机结构参数进行优化,获得最优滚筒结构和运动参数,对提高茶叶品质、杀青效率具有重要意义。针对目前茶叶杀青机械普遍效率低,以及机械结构设计存在盲目性等问题,研究了茶叶红外杀青机的滚筒锥角、导叶板倾角、导叶板螺旋角、导叶板高度及滚筒转速对杀青质量的影响,得出了茶叶红外杀青机滚筒结构最优结构参数。首先,结合茶叶红外杀青机结构及工作原理,利用计算流体力学软件Fluent与离散元软件EDEM对杀青机滚筒内茶叶颗粒的运动轨迹、滚筒内部温度分布及茶叶颗粒温度分布进行了耦合仿真;然后,设计了五因素四水平正交实验,以相同时间内茶叶升温速率最大为优化目标,研究了杀青机滚筒内导叶板螺旋角(A)、导叶板倾角(B)、滚筒转速(C)、滚筒锥角(D)及导叶板高度(E)对茶叶颗粒升温速率的影响,分析了不同结构参数组合下,杀青机滚筒结构参数对滚筒内部温度分布及茶叶颗粒升温速率的影响;最后,得到了杀青机最优结构参数,并研制了样机进行了试验。研究结果表明:滚筒结构参数对茶叶升温速率影响顺序为:C>A>B>E>D;最优结构参数组合为:导叶板螺旋角15°、导叶板倾角21°、滚筒转速37 r/min、导叶板高度55 mm、滚筒锥角2°;优化后,杀青机杀青效率提高了31.6%。Optimizing the structural parameters of the greening machine to obtain the optimal drum structure and motion parameters was of great significance for improving the quality of tea and the efficiency of greening.Aiming at the defects such as low efficiency and blindness in mechanical structure design of tea infrared de-enzyme machine.The influence of the cone angle of the drum,the inclination angle of the guide vane,the helix angle of the guide vane,the height of the guide vane and the rotating speed of the drum on the quality of the green tea were studied,and the optimal structural parameters of the drum structure of the infrared tea green fixing machine were obtained.Firstly,combined with the structure and working principle of the tea infrared de-enzyme machine,coupled Fluent of computational fluid dynamics with extended distinct element method(EDEM)were applied to simulate the movement trajectory of tea particle,the drum inner temperature distribution and the temperature distribution oftea particlein the de-enzyme machine cylinder.Then,helix angle of the guide vane(A),inclination angle of the guide vane(B),rotating speed of the cylinder(C),taper angleof the cylinder(D)and height of the guide vane(E)were used to design a five-factor and four-level orthogonal experiment,and the heating rate at the same time was as the optimization goal.Based on different structure parameter combination,the influence of the structural parameters of the de-enzyme machine cylinder on the inner temperature distribution of the cylinder and the heating rate of tea particles was investigated.Finally,based the analyzed results,the optimal structural parameters were obtained,and the prototype was trial-produced and tested.The results indicate that the influence degree of cylinder structural parameters on the tea heating rate is:C>A>B>E>D,and the optimum parameters of the structure are:helix angle of guide vane 15°,inclination angle of the guide vane 21°,rotating speed of the cylinder 37 r/min,height of the guide vane 55 mm and taper angl

关 键 词：茶叶杀青质量和效率 Fluent-EDEM耦合仿真 正交实验 滚筒结构优化 导叶板 滚筒转速 滚筒锥角 

分 类 号：TH122[机械工程—机械设计及理论] S226.6[农业科学—农业机械化工程]