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当前位置: 首页 > 文章 > 盒装荔枝果实降温特性数值分析与验证 农业机械学报 2016,47 (5) 218-224
Position: Home > Articles > Numerical Analysis and Verification on Characteristics of Temperature Decreasing of Litchi Fruits with Packages Transactions of the Chinese Society for Agricultural Machinery 2016,47 (5) 218-224

盒装荔枝果实降温特性数值分析与验证

作  者：
郭嘉明;吕恩利;陆华忠;方思贞;赵俊宏
单  位：
华南农业大学南方农业机械与装备关键技术教育部重点实验室
关键词：
荔枝;包装;预冷;降温特性;数值模拟
摘  要：
为掌握冷库带包装荔枝预冷果实温度变化的一般规律,建立了基于气调保鲜试验平台的荔枝果实预冷二维数值模型。结合荔枝果实及包装物理特性,对预冷过程中荔枝果实温度变化进行了数值分析,获得了厢体和包装内流场分布情况。研究结果表明,提高通风风速可以减少预冷时间,但会增大包装内荔枝果实间的温度差异性;当风速达到6 m/s以上,预冷时间减少放缓,果实温度变异系数趋于稳定,约为0.25;降低隔板空气出口温度可以有效促进荔枝果实降温,但会增加包装内荔枝果实间的温度差异性。经试验验证,模拟结果与试验结果吻合良好,平均误差率为1.91%,均方根误差为2.34%。
译  名：
Numerical Analysis and Verification on Characteristics of Temperature Decreasing of Litchi Fruits with Packages
作  者：
Guo Jiaming;Lü Enli;Lu Huazhong;Fang Sizhen;Zhao Junhong;Key Laboratory of Key Technology on Agricultural Machine and Equipment,Ministry of Education,South China Agricultural University;College of Engineering,South China Agricultural University;
关键词：
litchi;;package;;pre-cooling;;characteristics of temperature decreasing;;numerical simulation
摘  要：
In order to investigate the characteristics of temperature decreasing of litchi fruits with packages during pre-cooling in a cold room,a two-dimension numerical model was built based on the test platform with controlled atmosphere for fruits and vegetables. According to the thermo-physical properties of the package,litchi fruit and the platform,the process of the temperature decreasing of litchi fruit during pre-cooling was simulated by Fluent,after which the airflow information in the container and package were obtained. After that,some results can be drawn. Improving the ventilation velocity can shorten the process of pre-cooling but will improve the variable coefficient of temperature among litchi fruits in the package; When the air duct velocity is bigger than 6 m / s,the cooling rate trends to be steady along with the growing of air duct velocity,the variable coefficient was steady at roughly 0. 25; Reducing the air temperature on the partition outlet can effectively improve the temperature decreasing of litchi fruits during pre-cooling but also will improve the variable coefficient of temperature among litchi fruits in the package. A test was done to verify the accuracy of the model,and it found that the simulation values and experimental values are in good agreement,the average difference rate( MD) is 1. 91%,and the root-mean-square error( RMSE) is 2. 34%. Such results of this research reviews some characteristics of the pre-cooling of litchi fruits with packages in a cold room,which can provide a reference value for the optimization of the equipments and technologies for litchi fruit.

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