CAJ | 학술논문

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。
위료개선홍조간조궤내부류장적분포정황,이기체운동미분방정화표준k-ε단류모형위기출,다공개질모형대체물료층,이용계산류체동역학연건CFD대간조실적류장진행료수치모의,득도료열개질재간조실내적류동정황급입구풍속대물료층압강적영향。결과표명：간조궤입구풍속위5~7 m/s,가만족홍조간조속솔요구；기류진입간조실후당격벽면형성적와류현상,도치물료층풍속적불균균；수착입구풍속적증가,간조실내적압력유소상승,여홍조상하층압강정유규률적변화。통과대간조궤내부류장적연구,위홍조간조궤적설계개진제공과학의거。
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.