Simulation design of internal air duct of dehydrated vegetable dryer based on EDEM-FLUENT coupling

Abstract

Abstract:

In order to solve the problems of unstable quality of drying materials and low utilization rate of hot air caused by uneven distribution of hot air flow inside the dryer, a new vertical multi-layer hot air dryer was taken as the research object, and the EDEM-FLUENT gas-solid two-phase flow coupling method was used to simulate and analyze the air flow inside the air duct of different structures. The influence of different design structures in the inner cavity of the dryer on the distribution of hot air speed and drying efficiency was studied, and the wind speed distribution and non-uniformity coefficient were used as evaluation indexes to optimize the baffle structure of the inner cavity. A relatively ideal design scheme was obtained through comparative testing. Simulation results show that improving vertical wall tilt Angle, side wall tilt Angle and step spacing can effectively improve air distribution uniformity. When the air supply velocity ranges from 8 to 12 m/s, the flow distribution is relatively uniform and the fluctuation of non-uniform coefficient is the smallest.

Key words: air duct design, structural optimization, numerical simulation, airflow distribution, computational fluid dynamics

摘要： 为解决烘干机内部热风气流分布不均匀而导致烘干物料质量不稳定、热风利用率低等问题，以新型立式多层热风烘干机为研究对象，采用EDEM-FLUENT气固两相流耦合方法对不同结构内部风道的气流进行仿真分析，研究烘干机内腔不同设计结构对热风风速分布和烘干效率的影响，并以风速分布和不均匀系数为评价指标对内腔挡板结构进行优化，通过对比测试得到相对理想的设计方案。仿真结果表明，改进风道竖直壁面倾斜角度、侧壁倾斜角度和阶梯间距可以有效提升气流分布均匀性。风道供气速度范围为8~12 m/s时，气流分布相对均匀、不均匀系数波动幅度最小。

关键词: 风道设计, 结构优化, 数值模拟, 气流分布, 计算流体力学

CLC Number:

TS255.8
S126

Hu Bo, Liu Yao, Zhang Yongjun, Long Yan. Simulation design of internal air duct of dehydrated vegetable dryer based on EDEM-FLUENT coupling[J]. Journal of Chinese Agricultural Mechanization, 2024, 45(12): 116-126.

胡博, 刘尧, 张勇军, 龙艳. 基于EDEM-FLUENT耦合的脱水蔬菜烘干机内部风道仿真设计[J]. 中国农机化学报, 2024, 45(12): 116-126.

References

［1］　张学杰. 我国蔬菜及其加工出口产业发展状况与对策［J］. 中国蔬菜, 2018(8): 1-7.

Zhang Xuejie. Development situation and countermeasures of vegetable and its processing and exporting industry in China ［J］. China Vegetables, 2018(8): 1-7.

［2］　侯瑞明, 吕利贞. 脱水蔬菜的干制方法及其控制分析［J］. 农产品加工, 2017(24): 59-61.

Hou Ruiming, Lü Lizhen. Dried method of dehydrated vegetables and its control analysis ［J］. Farm Products Processing, 2017(24): 59-61.

［3］　王益强. 热泵干燥技术在脱水蔬菜加工中的应用［J］. 现代制造技术与装备, 2016(9): 114-115.Wang Yiqiang. Application of heat pump drying technology in the processing of dehydrated vegetables ［J］. Modern Manufacturing Technology and Equipment, 2016(9):114-115.

［4］　姜财勇, 程云, 杨亚男. 脱水果蔬产业现状及发展前景［J］. 现代食品, 2019(12): 48-50.

Jiang Caiong, Cheng Yun, Yang Yanan. Current situation and development prospect of dehydrated fruit and vegetable industry ［J］. Modern Food， 2019(12): 48-50.

［5］　于洋, 卢宇, 李若兰. 基于FLUENT的烘干机参数优化［J］. 机床与液压, 2019, 47(13): 140-143.

Yu Yang, Lu Yu, Li Ruolan. Optimization of dryer parameters based on FLUENT［J］. Machine Tool & Hydraulics, 2019, 47(13): 140-143.

［6］　心男. 基于EDEM-FLUENT耦合的气吹式排种器工作过程仿真分析［D］. 长春: 吉林大学, 2013.

Xin Nan. Simulation analysis of working process of airblowing seedmetering device based on coupled EDEM-FLUENT ［D］. Changchun: Jilin University, 2013.

［7］　温翔宇, 贾洪雷, 张胜伟, 等. 基于EDEM-Fluent耦合的颗粒肥料悬浮速度测定试验［J］. 农业机械学报, 2020, 51(3): 69-77.

Wen Xiangyu， Jia Honglei， Zhang Shengwei, et al. Test of suspension velocity of granular fertilizer based on EDEM-Fluent coupling ［J］. Transactions of the Chinese Society for Agricultural Machinery, 2020, 51(3): 69-77.

［8］　吴昊, 夏俊芳, 张国忠, 等. 基于EDEM-Fluent仿真的自旋射流式挖藕机的设计与试验［J］. 农业工程学报, 2018, 34(5): 9-14.

Wu Hao, Xia Junfang, Zhang Guozhong, et al. Design and experiment of spinjet flow type lotus root digging machine based on EDEM-Fluent ［J］. Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(5): 9-14.

［9］　李立伟, 孟志军, 王晓鸥, 等. 气送式水稻施肥机输肥装置气固两相流仿真分析［J］. 农业机械学报, 2018, 49(S1): 171-180.

Li Liwei, Meng Zhijun, Wang Xiaoou, et al. Simulation analysis of gassolid two phase flow in pneumatic conveying fertilizer feeder of rice fertilizer applicator ［J］. Transactions of the Chinese Society for Agricultural Machinery, 2018, 49(S1): 171-180.

［10］　杨凯, 高俊明, 李浩. 茶叶烘干机干燥过程数学模型的建立［J］. 福建茶叶, 2016, 38(11): 11-12.

［11］　霍二光. 菊花烘干室内气流组织模拟与优化研究［D］. 南昌: 南昌大学, 2016.

Huo Erguang. Simulation and optimization study on airflow organization in chrysanthemum drying room ［D］. Nanchang: Nanchang University, 2016.

［12］　刘道奇, 范传辉, 董慧锋, 等. 基于Fluent的负压式电加热干燥机内部流场分析与机构参数优化［J］. 食品与机械, 2017, 33(9): 94-98.

Liu Daoqi, Fan Chuanhui, Dong Huifeng, et al. Analysis of internal flow field and optimization of mechanism parameters of negative pressure electric heating dryer based on Fluent ［J］. Food & Machinery, 2017, 33(9): 94-98.

［13］　牟国良, 张学军, 史增录. 结合Fluent仿真软件的循环式干燥机改进设计研究［J］. 浙江农业学报, 2015, 27(4): 684-689.

Mou Guoliang， Zhang Xuejun， Shi Zenglu. Improved design of circulating dryer based on Fluent ［J］. Acta Agriculturae Zhejiangensis, 2015, 27(4): 684-689.

［14］　牟国良, 张学军, 史增录, 等. 红枣干燥设备的流场仿真研究［J］. 甘肃农业大学学报, 2014, 49(6): 157-161.

Mou Guoliang, Zhang Xuejun, Shi Zenglu, et al. A numerical simulation of drying equipment on jujube fruit ［J］. Journal of Gansu Agricultural University, 2014, 49(6): 157-161.

［15］　Demissie P, Hayelom M, Asfafaw A K, et al. Design, development and CFD modeling of indirect solar food dryer ［J］. Energy Procedia, 2019, 158: 1128-1134.

［16］　Amanlou Y, Zomorodian A. Applying CFD for designing a new fruit cabinet dryer ［J］. Journal of Food Engineering, 2010, 101(1): 8-15.

［17］　Chhanwal N, Anishaparvin A, D Indrani, et al. Computational fluid dynamics (CFD) modeling of an electrical heating oven for breadbaking process ［J］. Journal of Food Engineering, 2010, 100(3): 452-460.

［18］　张克平, 侯传凯, 孙步功, 等. 收获期豌豆籽粒离散元仿真参数标定［J］. 干旱地区农业研究, 2022, 40(6): 286-294.

Zhang Keping, Hou Chuankai, Sun Bugong, et al. Discrete element simulation parameter calibration of pea grains at harvest time ［J］. Agricultural Research in the Arid Areas, 2022, 40(6): 286-294.

［19］　王云霞, 梁志杰, 张东兴, 等. 基于离散元的玉米种子颗粒模型种间接触参数标定［J］. 农业工程学报, 2016, 32(22): 36-42.

Wang Yunxia, Liang Zhijie, Zhang Dongxing, et al. Calibration method of contact characteristic parameters for corn seeds based on EDEM ［J］. Transactions of the Chinese Society of Agricultural Engineering, 2016, 32(22): 36-42.

［20］　张荣芳, 周纪磊, 刘虎, 等. 玉米颗粒粘结模型离散元仿真参数标定方法研究［J］. 农业机械学报, 2022, 53(S1): 69-77.

Zhang Rongfang, Zhou Jilei, Liu Hu, et al. Determination of interspecific contact parameters of corn and simulation calibration of discrete element ［J］. Transactions of the Chinese Society of Agricultural Engineering, 2022, 53(S1): 69-77.

［21］　周海玲. 玉米果穗物理力学性质研究及脱粒过程仿真分析［D］. 长春：吉林大学, 2013.

Zhou Hailing. The physical and mechanical property research of corn ears and simulated analysis of corn threshing progress ［D］. Changchun：Jilin University, 2013.

［22］　赵丹华, 李国琳. 基于Fluent的玉米烘干塔内温度仿真研究［J］. 农业与技术, 2015, 35(17): 38-40.

Zhao Danhua, Li Guolin. Simulation of temperature in corn drying tower based on Fluent ［J］. Agriculture and Technology, 2015, 35(17): 38-40.

［23］　孙帮成, 李明高, 李明, 等. ANSYS FLUENT 140仿真分析与优化设计［M］. 北京: 机械工业出版社, 2013.

［24］　王福军. 计算流体动力学分析： CFD软件原理与应用［M］. 北京：清华大学出版社， 2007.

［25］　李若兰. 空气能热风式枸杞烘干机流场均匀性模拟研究［D］. 西安: 西安科技大学, 2019.

Li Ruolan. Simulating study on flow field hotair lycium barharum dryer ［D］. Xian: Xian University of Science and Technology, 2019.

［26］　Menasria F, Zedairia M, Moummi A. Numerical study of thermohydraulic performance of solar air heater duct equipped with novel continuous rectangular baffles with high aspect ratio ［J］. Energy, 2017, 133(15): 593-608.

［27］　任海伟, 李金平, 刘增光, 等. 太阳能干燥室内部气流场分布CFD数值模拟［J］. 农业机械学报, 2012, 43(S1): 235-238.

Ren Haiwei, Li Jinping, Liu Zengguang. Numerical simulation of airflow fields in solar drying chamber by CFD［J］. Transactions of the Chinese Society for Agricultural Machinery, 2012, 43(S1): 235-238.

［28］　Romero V M， Cerezo E， Garcia M I， et al. Simulation and validation of vanilla drying process in an indirect solar dryer prototype using CFD Fluent program ［C］. ISES Biennial Solar World Congress, 2014.

［29］　吕豪, 吕黄珍, 王雷, 等. 微波—热风振动流化床干燥机设计与试验［J］. 农业机械学报, 2019, 50(6): 344-351, 248.

Lü Hao, Lü Huangzhen, Wang Lei, et al. Design and experiment of microwavehotairflow vibrating dryer ［J］. Transactions of the Chinese Society for Agricultural Machinery, 2019, 50(6): 344-351, 248.

［30］　闫一野, 陈海峰, 张士玺. 基于Fluent的木材压干窑风速均匀性数值模拟［J］. 中南林业科技大学学报, 2012, 32(2): 151-154.

Yan Yiye, Chen Haifeng, Zhang Shixi. Numerical simulation of wind velocity homogeneity in wood pressdrying kiln based on Fluent ［J］. Journal of Central South University of Forestry & Technology, 2012, 32(2): 151-154.

［31］　张志伟, 刘建军. 各种湍流模型在FLUENT中的应用［J］. 河北水利, 2008(10): 25-26.

［32］　王振文, 吴敏, 徐新民, 等. 热泵烘房结构及参数优化仿真设计［J］. 农业机械学报, 2020, 51(S1): 464-475.

Wang Zhenwen, Wu Min, Xu Xinmin, et al. Optimal simulation design of structure and parameter in heat pump drying room ［J］. Transactions of the Chinese Society for Agricultural Machinery, 2020, 51(S1): 464-475.

[1]	Wusiman Wumuer, Rushanguli Wusiman, Alafate Maerdan, Satar Simayi. Study on optimization of life extension and cost reduction of key components of seed discharger of corn precision planter [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(9): 8-14.
[2]	Li Wei, Zhang Xiumei, Shao Mingxi. Design and optimization of structural parameters for hydraulic integrated block of tractor suspension in hilly and mountainous areas [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(9): 153-158.
[3]	Zhang Yuqian, Yu Qi, Hu Zhicheng, Chen Long, Yang Wencai, Zhang Haidong. Optimization design of axial‑flow suction seeder based on response surface methodology and CFD [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(8): 14-19.
[4]	Li Renfeng, Han Shunkai, Yang Fengbo. Research on downwash flow and droplet distribution of four-rotor plant protection UAV coupling with wind field [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(7): 81-86.
[5]	Xu Tianfu, Zhao Haiyan, Sang Weijun, Liu Jianfeng, Xie Kang, Sun Guangjun. Influence of plant protection UAV on the effect of pesticide application under various operating conditions based on CFD simulation [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(7): 87-96.
[6]	Jiao Ning, , Zhu Delan, , Jing Yupeng, , Liu Mengyang, , Liu Changxin. Research on determination method of greenhouse wet padfan operating parameters based on numerical simulation [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(5): 79-84.
[7]	Song Tao, Xie Xuehu, Zhang Liang, Liu Honghao, Ni Yuquan. Analysis of influence of secondary flow in sand sampler on the collecting range of sand [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(5): 253-257.
[8]	Guo Shaoqiang, Yao Yulong, , Wang Chuan, , Hu Bo, Zhang Qiqi, Cao Weidong. Study on rotor dynamic characteristics of large flow agricultural irrigation pump [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(5): 264-271.
[9]	Xie Chenshuo, , Kang Jianming, , Peng Qiangji, , Lin Xiangyang, Hou Jialin, . Numerical simulation and parameter optimization of trommel screen type membrane and impurity separation device [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(4): 1-11.
[10]	Li Leilei, Chen Bo, Li Jiachun, He Junjie. Optimum design of high efficiency air source heat pump barn [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(3): 81-89.
[11]	Ye Dapeng, , Shen Bihe, Zhang Binghui, Huang Junwei, Xie Limin, . CFD analysis and experimental research on variable volume bulk curing barn [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(3): 90-95.
[12]	Guo Jiangpeng, Xu Shuo, Wang Pengfei, Yang Xin, Li Jianping. Design and test of duck mouth spray device of multi duct spray machine [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(12): 109-115.
[13]	Liu Zhaoguang, Li Yaqin, Zhao Huanmin, Pu Yanyan, Qiu Xinwei, Fu Yanwei. Optimization design and experiment of air transmission system of multi‑duct orchard sprayer [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(11): 77-82.
[14]	Qian Chen, Chen Hongli, , Du Xiaoqiang, , Sun Liang, , Yang Zhenhua. Internal flow field simulation and equipment optimization of negative pressure harvesting machine for black fungus with short rod [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(11): 100-105.
[15]	Liu Yi, Song Pengxing, Liu Rongguo, Liu Jinghui, Yang Yang. Optimal design of uniform flow distribution of rectangular liquid fertilizer distributor based on FLUENT [J]. Journal of Chinese Agricultural Mechanization, 2024, 45(11): 234-239.