基于CFD的H型真空手套箱气固两相流动特性分析

Gas-solid two-phase flow characteristics of H-type vacuum glove box based on CFD

基于计算流体力学方法对H型真空手套箱气内流道气固两相流流动特性进行数值模拟,以特种工况手套箱为研究对象,建立H型真空手套箱三维模型,应用气固双向耦合的方法探究该型手套箱的内部流场。通过分析内流道在不同工况下气固两相速度、颗粒粒径变化对固相运动过程的影响,对实际生产过程中箱体内达到理想氛围耗时较长、局部产生颗粒物沉积或烟雾现象进行阐释。通过理论分析和仿真发现,当固体颗粒物粒径恒定为90 nm时,随着进气口速度增大固体颗粒物速度随之明显增大,当进气口速度恒定为4.777 m/s,且颗粒粒径小于5μm时,固体颗粒物对气流组织伴随性良好;固体颗粒物粒径大于等于10μm时,固体颗粒物对气流组织伴随性较差,可能会产生局部沉积现象。

Based on computational fluid dynamics(CFD) method,the flow characteristics of gas-solid two-phase flow in the inner passage of H-type vacuum glove box were numerically simulated. Taking the glove box under special conditions as the research object,a three-dimensional model of H-type vacuum glove box was established,and the internal flow field of the glove box was explored using the gas-solid two-way coupling method. By analyzing the influence of gas-solid two-phase velocity and particle size variation on the solid phase movement process under different working conditions in the inner flow passage,the phenomenon that it took a long time to reach the ideal atmosphere in the actual production process,and the phenomenon of particle deposition or smoke were explained. Through theoretical analysis and simulation,it is found that when the particle size of solid particles is constant at 90 nm,the velocity of solid particles increases obviously with the increasing of the inlet velocity. When the inlet velocity is constant at 4. 777 m/s and the particle size is less than 5 μm,the solid particles have good adjoint to the airflow structure. When the particle size of solid particles is greater than or equal to 10 μm,solid particles have poor concomitant effect on airflow structure,and local deposition may occur.