箱体几何结构对刨花板气流铺装机流场特性的影响  

Influence of box geometry structure on flow field characteristics of particleboard airflow forming machine

作　　者：陈青[1] 张健 施明宏 周宏平[1] 沈文荣[2] 刘光新[2] 刘栋[2] CHEN Qing;ZHANG Jian;SHI Minghong;ZHOU Hongping;SHEN Wenrong;LIU Guangxin;LIU Dong(College of Mechanical and Electronic Engineering,Nanjing Forestry University,Nanjing 210037,China;Suzhou Sufoma Machinery Co.Ltd.,Suzhou 215129,Jiangsu,China)

机构地区：[1]南京林业大学机械电子工程学院,南京210037 [2]苏州苏福马机械有限公司,江苏苏州215129

出　　处：《林业工程学报》2020年第6期114-120,共7页Journal of Forestry Engineering

基　　金：国家自然科学基金(51906111);国家重点研发计划(2018YFD0600202)。

摘　　要：在刨花板生产过程中,铺装机可实现刨花板的不间断生产。刨花气流铺装机最大的技术难点在于对气流场特性的把控,箱体几何结构对气流铺装机内部流场有重要影响,而目前主要是通过反复试验进行研究,研究周期长,加工成本较高。通过计算流体力学方法对气流铺装机气流场进行几何和物理建模,对耦合刨花板气流铺装机气流场和刨花颗粒的气固两相流场进行数值模拟计算,通过调整箱体几何参数,分析气流场变化特性,从而把控箱体几何结构对气流铺装机内部流场特性的影响。模拟结果表明:箱体坎肩后移与坎肩前移相比,气流回旋所造成的紊流现象较小,但箱体尾部压力增大明显;当箱体去除坎肩后紊流影响进一步减小,但整个箱体内的压力剧烈增大,可能会导致抽风口的破坏;当箱体坎肩后移和去除坎肩时,刨花颗粒在底面的沉积都更为均匀,铺装质量得到提高,且坎肩后移的箱体从抽风口逃逸的刨花颗粒少于去除坎肩的箱体。综合各因素,在实际设计气流铺装机箱体时,需要设置坎肩且箱体坎肩应适当后移,坎肩距离小于2570 mm,从而降低紊流影响,提高板坯铺装质量。In the production of particleboard,the particleboard forming machine plays a vital role in the uninterrupted production of particleboard.Particle mat forming is an important section in the particleboard production.The performance of the particle mat forming not only affects the thickness tolerance,mechanical properties,structural symmetry and surface quality of the board,but also plays a decisive role in the diversification of the board product specifications to realize special functions.The most difficult technical problem of the airflow forming machine is to control the characteristics of the airflow field,and the box geometry has an important effect on the internal flow field of the airflow forming machine.It is urgent to investigate the influence of the box geometry on the flow field characteristics of the airflow forming machine.In this study,the flow field of particleboard airflow forming machine was modeled physically and geometrically by the computational fluid dynamics method,and the numerical simulation of gas-solid two-phase flow field of particleboard airflow forming machine coupled with the particles movement was carried out.The correctness of the calculation model was verified by comparing the characteristic point velocity obtained from the experiment and simulation.By adjusting the box geometric parameters,the changing characteristics of the flow field were analyzed,so as to control the influence of the box geometric structure on the flow field characteristics inside the airflow forming machine.The simulation results showed that,compared with the forward movement of the cantilevered shoulder,the turbulence caused by the airflow was smaller when the cantilevered shoulder of the formed box moved backward,but the pressure at the end of the box increased obviously.When the shoulder of forming box was removed,the effect of turbulence was further reduced,but the pressure in the whole forming box increased sharply,which may lead to the damage of the suction outlet.When the shoulder of forming box was move

关 键 词：气流铺装机 箱体几何结构 数值模拟 流场特性 

分 类 号：S777[农业科学—森林工程]