作 者：
何磊;张宪;赵章风;钟江;王祥华;孟庆杭
单 位：
浙江机电职业技术学院;浙江工业大学特种装备制造与先进加工技术教育部重点实验室;浙江上洋机械制造有限公司
关键词：
茶叶杀青;滚筒;结构运动参数;PFC3D;过程数值模拟
摘 要：
为提高茶叶杀青质量,以用于名茶加工的滚筒杀青机为例,基于离散元分析技术的PFC3D法,对杀青过程的各相关参数进行数值模拟,如滚筒转速、导叶板数量、布局、倾角及结构,滚筒倾角与壁温等对杀青效果的影响,并进行了优化设计和试验验证。结果表明:滚筒杀青时,存在最佳转速;滚筒前段布置较多的导叶板,有利于杀青叶温度的迅速提高;适当增加导叶板倾角和采用"L"型导叶板,将提高茶叶在筒壁上的散度,有利于杀青叶温度的均匀;在保证杀青质量前提下,滚筒平均壁温和倾角呈双指数函数关系;杀青效率和滚筒倾角呈二次函数关系。研究还表明,所采用的研究方法同样适用于滚筒式设备干燥颗粒状农产品的技术研究。
译 名：
Numerical simulation and parameter analysis of fresh tea leaf fixation process based on PFC3D
作 者：
HE Lei1,ZHANG Xian1,ZHAO Zhangfeng1,ZHONG Jiang1,WANG Xianghua2,MENG Qinghang3(1.Key Laboratory of Special Purpose Equipment and Advanced Processing Technology,Ministry of Education, Zhejiang University of Technology,Hangzhou 310014,China;2.Zhejiang Institute of Mechanical and Electrical Engineering, Hangzhou 310053,China;3.Zhejiang Shangyang Machinery Co.,Ltd,Quzhou 324000,China)
关键词：
tea water-removing;cylinder;structure and movement parameter;PFC3D;numerical simulation
摘 要：
In order to improve fixation quality of tea,fresh green tea leaf fixation was analyzed based on discrete element method.Take the cylinder fixation machine used for famous tea for example,effects of speed of cylinder rotating,number of guide baffle,distribution of guide baffle,angle of guide baffle,structure of guide baffle,angle of cylinder and cylinder temperature on fidation were investigated.At the same time,optimal design and experimental verification were also done after numerical simulation.The results show that cylinder fixation machine has an optimum rotating speed.Compared to the posterior segment structure of cylinder,the number of guide baffle in forepart segment is conducive to increase temperature rising rate.The spread extent of tea in the fixation process,which is good for the uniformity of tea temperature,could be improved by increasing proper angle of guide baffle and using L-shaped guide baffle.The average temperature of cylinder wall has a double exponential relationship with the cylinder angle,while the fixation efficiency has a quadratic function relationship with the cylinder angle.The research also shows that the above method can also be used in the studying of drying granular agricultural products using cylinder-type equipment.
