摘要
设计了一套实验装置研究微气泡减阻的效果.采用高速摄像机对二维平板微气泡湍流边界层进行了定量的可视化观察,用天平测量了平板的摩擦阻力,分析了不同通气量、来流速度、浮力对减阻性能的影响.结果表明,微气泡在高Reynolds数(Re=10~6)的流动中有效地减小了摩擦阻力,最大减阻率达到36%,证实了微气泡能显著降低平板摩擦阻力,实验结果也表明,随气体流量增加,减阻率增加.
A set of testing apparatus to study the effects of microbubbles drag reduction was designed in this paper. The turbulent boundary layer was formed on the surface of a 2D flat plate. The behaviors of the microbubbles were visualized quantitatively using the high speed camera. The skin-friction drag was measured using balances. The effects of the drag reduction with different air flow, free-stream velocity and buoyancy were analyzed. It shows that the microbubbles are effective in reducing the skin friction in high Reynolds number regime of 10~6. It proves that microbubbles can significantly reduce skinfriction of the solid wall and the drag reduction radio is up to 36%. Results show that when the gas flow rate increases, the skin-friction reduction ratio increases.
出处
《气体物理》
2017年第4期29-35,共7页
Physics of Gases
基金
国家自然科学基金(11602261)
关键词
微气泡
平板
湍流边界层
摩擦阻力
减阻
microbubbles
plate
turbulent boundary layer
skin friction
drag reduction
