基于CFD的烟叶松散润叶筒气固耦合数值模拟  

Numerical simulation of gas-solid coupling in moistening cylinder oftobacco based on CFD

作　　者：徐超 金浩 蒋明洋 沈凯[2] 潘凡达[2] 樊虎 XU Chao;JIN Hao;JIANG Mingyang;SHEN Kai;PAN Fanda;FAN Hu(College of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;Zhejiang Tobacco Industry Co.Ltd,Hangzhou,Zhejiang 310024,China)

机构地区：[1]华东理工大学化学学院,上海200237 [2]浙江中烟工业有限责任公司,浙江杭州310024

出　　处：《湖南农业大学学报（自然科学版）》2024年第4期103-110,128,共9页Journal of Hunan Agricultural University(Natural Sciences)

基　　金：浙江中烟工业有限责任公司科技项目(ZJZY2021A006);中国烟草总公司重点研发项目(110202102042)。

摘　　要：针对烟叶松散润叶筒内部的“黑箱”问题,基于计算流体力学(CFD)对其进行气固双向耦合的数值模拟,通过建立可视化的流场和温度场模型,探讨润叶过程的影响因素和影响机理。结果表明:流场模拟中,颗粒的存在能有效改善气体流动形式,总体气相速率从1.0 m/s降低到0.3 m/s,增加了气固间的接触,强化了两相间的传热;温度场模拟中,温度变化呈现阶段式变化,在润叶筒前半段气固之间传热显著,气相平均温度由81.0℃下降至68.8℃,颗粒平均温度从25.0℃迅速升温到64.8℃,后半段温度维持相对稳定,气固间传热的热流密度随着轴向位置呈现先逐步下降后平稳的趋势;气相、颗粒温度的模拟值与试验实测值的相对误差分别为0.7%、-2.5%,模拟值与试验实测值整体吻合良好,说明模型合理有效;随着筒体倾角、转速增大,两相间的传热效果随之减弱,为满足润叶工艺要求,筒体倾角应小于8°,综合考虑生产速率与能耗,转速应选择15 r/min。Aiming at the study of the problem of‘black box’inside the moistening cylinder,we used thecomputational fluid dynamics(CFD)and proposed a numericalsimulation of gas-solid two-way coupling.By establishing a visual flow field and temperature field model,the influencing factors and influencing mechanism of the blade process were investigated.The results showedthat the existence of particlesin the flow field simulation couldeffectively improve the gas flow form and the contact between gas andsolid.The overall gas phase velocity decreased from 1.0 m/s to 0.3 m/s and strengthenedthe heat transfer between the two phases.In temperature field simulation,temperature change showeda stage-likechange,and the heat transfer between the gas and solid in the first half of the moistening cylinder was significant,the average temperature of the gas phase decreased from 81.0℃to 68.8℃,while the average temperature of the particles rapidly increased from 25.0℃to 64.8℃.The temperature in the second half wasrelatively stable.The heat flux density of gas-solid heat transfer showeda trend of gradually decreasing and then stabilizing with axial position.The relative errors between the simulated values and the experimental values of the gas phase and particle temperature were 0.7%and-2.5%respectively,and the simulated values were in good agreement with the experimental values on the whole,indicating that the model was reasonable and effective.Further study found that with the increase of cylinder inclination and rotation speed,the heat transfer effect between the two phases decreased.To meet the requirements of the lubrication process,the inclination angle of the cylinder should be less than 8°.Considering the production rate and energy consumption,the rotational speed should be selected as 15 r/min.

关 键 词：烟叶 松散润叶筒 两相流 颗粒运动 传热 数值模拟 

分 类 号：TS43[农业科学—烟草工业]