气泡羽流摆动特性及附壁效应研究  

Characteristics of bubble plume oscillation and the Coanda effect

作　　者：程以炫 董恒瑞 闫睿奎 危卫[1] CHENG Yi-xuan;DONG Heng-rui;YAN Rui-kui;WEI Wei(School of Energy and Power Engineering,Wuhan University of Technology,Wuhan 430063,China;CCCC Guangzhou Dredging Co.Ltd.,Guangzhou 510220,China)

机构地区：[1]武汉理工大学能源与动力工程学院,湖北武汉430063 [2]中交广州航道局有限公司,广东广州510220

出　　处：《高校化学工程学报》2020年第4期904-911,共8页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(51679178)。

摘　　要：针对气泡发生器中气泡在上升阶段发生的摆动现象会影响气泡生成效率的问题,利用流体体积函数(VOF)模型模拟了水槽内气泡生成和上升过程,研究了通气速度、气泡孔口直径和水槽高宽比对气泡羽流的影响,探究气泡的摆动特性和偏移程度。结果表明,气泡羽流摆动的最大偏移量与弗劳德数和水槽宽高比呈指数衰变关系;而最大偏移量对应的偏移角度与弗劳德数和水槽宽高比呈多项式关系。根据所得数据拟合得到相关经验关系式,给出了不同弗劳德数和水槽宽高比对应的气泡摆动特性的规律。Bubbles in bubble generators oscillate during rising,which affects bubble generation efficiency.A VOF model was used to simulate bubble generation and rising in a water tank.Different aeration speeds,orifice diameters and aspect ratios were examined.The oscillation characteristics and degree of oscillation were studied.The results show that the maximum offset of bubble plume oscillation decays exponentially with the Froude number and the aspect ratio.The offset angle corresponding to the maximum offset was polynomial with the Froude number and the aspect ratio.A relevant empirical correlation was given,and the law of bubble oscillation characteristics corresponding to different Froude numbers and sink aspect ratios was obtained.

关 键 词：计算流体力学 附壁效应 气泡羽流 气液两相流 VOF模型 

分 类 号：O359[理学—流体力学]