摘要：为了分析振动力对气-固流化床中气泡行为的影响,探究振动力改善流化床中颗粒流化状态的深层原因,采用计算流体力学方法,运用Fluent14.5及PBM模块模拟了振动流化床中气泡的尺寸、上升速度及床层波动等变化规律,通过物理模型构建、数学模型修正、网格划分、边界条件设定、实验验证等环节,揭示了振动力加入前、后床内气泡尺寸分布、气泡上升速率沿高度分布、床层压力的脉动信号变化的周期性等的变化特征。结果表明:未加振动时,气泡尺寸分布比较均匀,大气泡较少,气泡直径随着床层高度增加而增大;加入振动后,气泡在床内分布不均匀,大气泡较多;在气泡上升初期,气泡直径不断变大,气泡上升速度也不断增大,而后期气泡上升速度不断减小;床层压力脉动信号的周期性明显增强。

关键词：振动流化床；振动力；气泡行为；数值模拟

Abstract： To analyze the effect of vibration force on bubble behavior in a gas -solid fluidized bed， and explore the underlying causes of vibration force in improving the fluid state in a fluidized bed， computational fluid dynamics methods and PBM module of Fluent 14.5 were used to study the characteristic of bubble behavior in a vibro-fluidized bed against the actual experimental results. Through physical modeling， mathematical model updating， meshing， boundary condition setting and the actual test results， it was performed to compare the size distribution and the rising veolcity of bubbles， the bed pressure fluctuation signals and other features changes with vibration force. The results show that the bubble size distribution is more uniform and the large bubbles are less， the diameter of bubbles increases with the bed height without vibration. After joining vibration， there is an uneven size distribution of bubbles in the bed， large bubbles are more. At the beginning of the bubble rising， the diameter of bubbles grows， the rising velocity of bubbles increases and then decreases in the late. The periodicity of bed pressure fluctuation signal increases apparently. 

Keywords: vibro-fluidized bed; vibration force; bubble behavior; numerical simulation