红枣干燥设备的流场仿真研究  

A numerical simulation of drying equipment on jujube fruit

作　　者：牟国良[1] 张学军[1,2] 史增录[1,2] 于蒙杰[1] 鄢金山[1,2] 

机构地区：[1]新疆农业大学机械交通学院,新疆乌鲁木齐830052 [2]新疆农业工程装备创新设计重点实验室,新疆乌鲁木齐830052

出　　处：《甘肃农业大学学报》2014年第6期157-161,167,共6页Journal of Gansu Agricultural University

基　　金：自治区"十二五"科技重大专项(201130102-4);新疆农业大学前期资助招标课题(XJAU201226)

摘　　要：为了改善红枣干燥机内部流场的分布情况,以气体运动微分方程和标准k-ε湍流模型为基础,多孔介质模型代替物料层,利用计算流体动力学软件CFD对干燥室的流场进行了数值模拟,得到了热介质在干燥室内的流动情况及入口风速对物料层压降的影响。结果表明：干燥机入口风速为5~7 m/s,可满足红枣干燥速率要求；气流进入干燥室后撞击壁面形成的涡流现象,导致物料层风速的不均匀；随着入口风速的增加,干燥室内的压力有所上升,与红枣上下层压降呈有规律的变化。通过对干燥机内部流场的研究,为红枣干燥机的设计改进提供科学依据。In order to improve the internal flow field distribution of j uj ubes dryer,the Computational Fluid Dynamics （CFD）was used to simulate the inner flow of drying chamber based on the differential e-quation,and standard k-εturbulence model and porous medium model.The flow characteristics in the dr-ying chamber and the effect of inlet velocity on the pressure drop between material layers were obtained and used to analyze the improved designs based on the original structure.The simulation results indicated that the inlet velocity of dryer was 5~7 m/s,which could meet the requirements of the j uj ubes drying rate;four symmetrical reverse vortex zones were formed by the airflow impinging wall,which led to uneven ve-locity in the lower fruit;with the increase of inlet velocity,the pressure of drying chamber also rose,and in-let velocity and pressure drop between material layers changed regularly.The results provide the basis for the design of j uj ube fruit dryer by studying the inner flow of drying chamber.

关 键 词：红枣 干燥机 流场 数值模拟 

分 类 号：TS203[轻工技术与工程—食品科学]