仿真研究气泡流中的卡门涡街

Simulation Study of the Kármán Vortex Street in Bubble Flow

利用COMSOL软件中的层流模型研究了气泡流中的卡门涡街现象。在中低雷诺数范围内,利用三种方法获得了气泡流的斯特劳哈尔数。相比纯水,气泡流具有较大的斯特劳哈尔数(St≈0.24)。在研究的参数范围内(障碍物尺寸2~5 cm、入射流速0.02~0.07 m/s),涡脱频率和入射流速成正比,和障碍物直径成反比,波长和障碍物直径成正比。

The phenomenon of Kármán vortex street in bubble flow was studied using the laminar flow model in COMSOL software.Within the range of low to moderate Reynolds numbers,the Strouhal number of bubble flow was obtained using three methods.Compared to pure water,bubble flow has a larger Strouhal number(St≈0.24).Within the studied parameter range(obstacle size 2~5 cm,inflow velocity 0.02~0.07 m/s),the vortex shedding frequency is directly proportional to the inflow velocity,inversely proportional to the obstacle diameter,and the wavelength is directly proportional to the obstacle diameter.