热科学学报（英文版）2005，Vol.14Issue(3)：193-197,5.
Experimental Study of Turbulent Boundary Layers on Groove/Smooth Flat Surfaces
Experimental Study of Turbulent Boundary Layers on Groove/Smooth Flat Surfaces
摘要
Abstract
This paper presents an experimental investigation of the turbulent boundary layers on both groove and smooth flat surfaces. The flow structures were shown in a water tunnel using the hydrogen-bubble flow visualization technique. The measurement results indicate that: (1) the grooves can effectively reduce accumulation of low-speed fluids, decrease the number of the low-speed streaks and depress oscillation of the streaks in the sublayer; (2) the grooves can restrain forming of the horseshoe vortices in the buffer region; (3) the grooves bate oscillation and kinking of the quasi-streamwise vortices and restrain production of the hairpin vortices and the ring vortices, reducing both frequency and intensity of the turbulence bursting; (4) the grooves directly affect the flow structures in the sublayer of the boundary layer and then modulate the flow field up to the buffer region and the logarithmic region by restraining development and interaction of the vortices.关键词
streamwise groove/turbulent boundary layer/drag reduction mechanism/coherent structure/hydrogen-bubble flow visualizationKey words
streamwise groove/turbulent boundary layer/drag reduction mechanism/coherent structure/hydrogen-bubble flow visualization分类
数理科学引用本文复制引用
Hongwei MA,Qiao TIAN,Hui WU..Experimental Study of Turbulent Boundary Layers on Groove/Smooth Flat Surfaces[J].热科学学报（英文版）,2005,14(3):193-197,5.基金项目
Project funded by National Natural Science Foundation of China, Grant No.50376002. （）
