摘要
为了探索弹簧烟竿装烟烘烤过程中烟叶的温湿度响应特性,研究温度和含水率变化对烟叶应力分布和变形造成的影响,利用Comsol软件建立了弹簧烟竿装烟烘烤时烟叶的仿真模型,结合傅里叶传热模型和基于菲克第二定律的传质模型,实现弹簧烟竿装烟烘烤过程中热膨胀、干燥收缩变形的多物理场耦合数值仿真。结果表明:(1)烘烤结束时烟叶的温度达到65℃,含水率为8.57%,收缩率为33.2%;(2)烘烤过程中含水率变化引起的湿应力明显高于温度引起的热应力,表明水分胁迫作用比温度对烟叶变形的影响更大;(3)烟叶的最大等效应力出现在叶梗夹持部位,但最大应力始终低于叶梗的抗压强度,叶梗部分在烘烤过程中不会发生损伤。采用弹簧烟竿装烟烘烤工艺可以满足烟叶烘烤的农艺要求。
In order to explore the thermal-hygroscopic response of tobacco leaves during curing process by tobacco-weaving pole with springs,the effects of temperature and moisture content variation on stress distribution and deformation were studied,and the simulation models of tobacco-weaving pole with springs and fresh tobacco leaves were developed by Comsol.Combined with Fourier’s heat-transfer model and mass-transfer model,based on Fick’s second law,the multi-physics coupling numerical simulation of thermal expansion,hygroscopic shrinkage deformation in curing process by tobacco-weaving pole with springs was conducted.The results showed that:(1)At the end of curing,the temperature reached 65℃.The moisture content was 8.57%,and the shrinkage rate was 33.2%.(2)The moisture stress of tobacco leaf was obviously greater than thermal stress during curing,which indicated that the effect of moisture stress on the deformation of tobacco leaves was greater than that of temperature.(3)The maximum equivalent stress of tobacco leaves appeared in the gripping part of leaf stem,but the maximum stress was always lower than the compressive strength of leaf stem,and the leaf stem part would not be damaged during curing.The tobacco leaf curing using tobacco-weaving pole with springs can meet the agronomic requirement.
作者
符德龙
温宇鑫
郑乐
张富贵
黄兰
FU De-long;WEN Yu-xin;ZHENG Le;ZHANG Fu-gui;HUANG Lan(Bijie Branch of Guizhou Tobacco Company,Bijie 551700,China;College of Mechanical Engineering,Guizhou University,Guiyang 550025,China)
出处
《江西农业学报》
CAS
2022年第12期1-8,共8页
Acta Agriculturae Jiangxi
基金
贵州省烟草公司毕节市公司科技项目“弹簧预紧挤压式烟竿研制与推广应用”(2021520500240222)。
关键词
弹簧烟竿
烟叶
烘烤
热膨胀
收缩变形
Tobacco-weaving pole with springs
Tobacco leaf
Curing
Thermal expansion
Shrinkage deformation
