郭嘉明,吕恩利,陆华忠,方思贞,赵俊宏.盒装荔枝果实降温特性数值分析与验证[J].农业机械学报,2016,47(5):218-224.
Guo Jiaming,Lü Enli,Lu Huazhong,Fang Sizhen,Zhao Junhong.Numerical Analysis and Verification on Characteristics of Temperature Decreasing of Litchi Fruits with Packages[J].Transactions of the Chinese Society for Agricultural Machinery,2016,47(5):218-224.
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盒装荔枝果实降温特性数值分析与验证   [下载全文]
Numerical Analysis and Verification on Characteristics of Temperature Decreasing of Litchi Fruits with Packages   [Download Pdf][in English]
投稿时间:2016-01-08  
DOI:10.6041/j.issn.1000-1298.2016.05.030
中文关键词:  荔枝  包装  预冷  降温特性  数值模拟
基金项目:“十二五”国家科技支撑计划项目(2013BAD19B01-1-3)和现代农业产业技术体系建设专项基金项目(CARS-33-13)
作者单位
郭嘉明 华南农业大学 
吕恩利 华南农业大学 
陆华忠 华南农业大学 
方思贞 华南农业大学 
赵俊宏 华南农业大学 
中文摘要: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%。
Guo Jiaming  Lü Enli  Lu Huazhong  Fang Sizhen  Zhao Junhong
South China Agricultural University,South China Agricultural University,South China Agricultural University,South China Agricultural University and South China Agricultural University
Key Words:litchi  package  pre cooling  characteristics of temperature decreasing  numerical simulation
Abstract: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.

Transactions of the Chinese Society for Agriculture Machinery (CSAM), in charged of China Association for Science and Technology (CAST), sponsored by CSAM and Chinese Academy of Agricultural Mechanization Science(CAAMS), started publication in 1957. It is the earliest interdisciplinary journal in Chinese which combines agricultural and engineering. It always closely grasps the development direction of agriculture engineering disciplines and the published papers represent the highest academic level of agriculture engineering in China. Currently, nearly 8,000 papers have been already published. There are around 3,000 papers contributed to the journal each year, but only around 600 of them will be accepted. Transactions of CSAM focuses on a wide range of agricultural machinery, irrigation, electronics, robotics, agro-products engineering, biological energy, agricultural structures and environment and more. Subjects in Transactions of the CSAM have been embodied by many internationally well-known index systems, such as: EI Compendex, CA, CSA, etc.

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