摘要
多孔介质圆柱绕流在化工领域被广泛应用于生化过滤器和流化床等构筑物,但迄今未见对并列多孔圆柱绕流问题的分析。文章数值分析了间距比L∶D=2∶1的并列多孔双圆柱在雷诺数为200渗透率对其流场形态的影响。结果表明流场随着时间发展出现两个稳态,当流场进入第二稳态时,由于两个圆柱之间的斥力,其尾涡相互影响。当渗透率较大时,最终形成一宽一窄两个涡街。而当渗透率较小时,多孔圆柱表现接近于实心双圆柱,下游尾涡相互融合。
The flow of porous medium around cylinder is widely applied in chemical and biological filter and fluidized bed structures in the field of chemical industry. However, there is not an analysis of the porous cylinder flow around analysis of flow over cylinders in side-by-side arrangement. The paper uses the method of numerical analysis to study the influence on the flow pattern where the spacing ratio of porous permeability double columns equals to L ： D-2 ： 1 and the Reynolds number is 200. The result shows that two steady states emerge with the time development. Moreover, the trailing vortexes influence each other when flow field entering into the second steady-state because of the repulsion between the two columns. When the permeability is biggish, it finally comes out two vortex streets while one is wide and the other is narrow. And when the permeability is lesser, the porous cylinder performs close to the solid double column with the downstream trailing vortex.
出处
《广东化工》
CAS
2015年第12期21-23,28,共4页
Guangdong Chemical Industry
关键词
多孔介质
达西数
数值模拟
porous media
Darcy number
numerical modeling
