核桃烘干装置内部热-流-固耦合传热分析与参数优化  

Analysis and parameter optimization of hot-fluid-solid coupling heat transfer in walnut drying device

作　　者：李三平[1] 齐佳美 袁龙强 林海斌 吴立国[1,2] LI Sanping;QI Jiamei;YUAN Longqiang;LIN Haibin;WU Liguo(School of Mechanical and Electrical Engineering,Northeast Forestry University,Harbin 150040,China;Harbin Forestry Machinery Research Institute,State Forestry and Grassland Administration,Harbin 150086,China)

机构地区：[1]东北林业大学机电工程学院,哈尔滨150040 [2]国家林业和草原局哈尔滨林业机械研究所,哈尔滨150086

出　　处：《包装与食品机械》2023年第5期107-112,共6页Packaging and Food Machinery

基　　金：中央级公益性科研院所基本科研业务费专项(CAFYBB2020MB010);中央高校基本科研业务费专项资金资助(2572014BB06)。

摘　　要：针对刚采摘的青核桃含水率高的问题,设计一个核桃烘干装置模型,对青核桃进行预烘干处理及确定最优的核桃烘干参数。通过3因素3水平正交试验探究不同入口温度、入口风速和烘干时间对烘干装置内部温度、速度场以及核桃温度的影响。使用Fluent软件将核桃建模成一个3层球体,分别为核桃外壳、核桃气隙、核桃仁;分别对不同烘干参数下的烘干装置与核桃进行数值模拟研究,获得烘干装置内部温度场、速度场的分布情况以及核桃温度变化规律,得到烘干装置内部与核桃的温度变化曲线。结果表明,当入口温度为393 K,入口风速为1.7 m/s,烘干时间为45 min,烘干装置内部以及核桃的温度场分布最好,变化最均匀;通过试验验证仿真数据的可靠性,试验结果与仿真结果变化曲线一致。研究结果为确定核桃预烘干最佳工艺参数提供理论依据。Aiming at the problem of high moisture content of freshly picked green walnuts,a walnut drying device model was designed to pre-dry green walnuts and determine the optimal walnut drying parameters.The effects of different inlet temperature,inlet velocity and drying time on the internal temperature,walnut temperature and velocity field of the drying device were explored through the 3-factor 3-level orthogonal test.Fluent software was used to model walnuts into a 3-layer sphere,which are walnut shell,walnut air gap,walnut kernel;The numerical simulation of the drying device and walnut under different drying parameters was carried out to obtain the distribution of the temperature field and velocity field inside the drying device and the temperature change law of walnut,and the temperature change curve between the drying device and the walnut was obtained.The results show that when the inlet temperature is 393 K,the inlet velocity is 1.7 m/s,and the drying time is 45 min,the temperature field distribution inside the drying device and walnuts is the best and the most uniform.The reliability of the simulation data is verified by experiments,and the test results are consistent with the change curve of the simulation results.The research results lay a theoretical basis for determining the optimal drying process parameters for walnut pre-drying.

关 键 词：核桃烘干 Fluent仿真 热-流-固耦合 温度场分析 

分 类 号：TS225.35[轻工技术与工程—粮食、油脂及植物蛋白工程]