摘要
板栗脱壳历来是板栗加工的技术难题,本文介绍了板栗在真空中破壳的机理的研究现状。根据板栗的几何尺寸和物理参数,用ANSYS软件建立了板栗的有限元分析模型。分别用ANSYS模拟了在加热过程中的湿度场和温度场的分布,以及对它们产生的应力和应变进行了分析。对温度场、湿度场和压力场也进行了耦合分析,找出了最大应力和应变产生的位置。同时,对影响板栗真空破壳特性的因素进行了模拟研究,模拟结果表明,板栗的大小、形状对真空破壳的影响显著,破壳率随真空度的降低而增大。验证模拟结果和实验结果表明,所建的模型具有可行性。
The temperature and moisture fields in heating Chinese chestnuts was empirically approximated,physically modeled,and numerically simulated in finite element method with ANSYS to optimize its vacuum shellcracking conditions on industrial scale. The influence of the conditions,such as the heating rate,holding temperature and time,pressure,chestnut＇s size and geometry,on the distributions of thermal and moisture stresses and stains in a chestnut was investigated. The temperature dependent time-evolutions of both thermal and humidity stress and strain were found to vary in the same increase-decrease mode,but peaking under different conditions. The preliminary results show that the chestnuts＇ size and geometry and environment pressure all have a major impact on the shellcracking rate. For instance,the shell-cracking rate sharply increased with a decrease of pressure. The simulated data were found to agree fairly well with the test results.
出处
《真空科学与技术学报》
EI
CAS
CSCD
北大核心
2014年第11期1272-1277,共6页
Chinese Journal of Vacuum Science and Technology
基金
陕西省工业攻关项目资助(2012K09-05)
关键词
板栗
真空破壳
应力应变
有限元方法
Chinses chestnut
Vacuum shell cracking
Stress-strain
Finite element method
