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引入展向调制的二维人工扰动激发平板边界层转捩 ,利用水槽氢气泡流动显示技术观察到转捩边界层中典型三维扰动的产生和发展 ,包括Λ结构、发卡涡以及发卡涡演化生成环状涡的过程 .实验结果显示出环状涡和尖峰结构的关系 ,直接证实了尖峰结构的产生机理 .在流动紊乱化初始阶段发现常出现在湍流边界层中的暗斑结构 ,结果表明与暗斑相伴随的局部高剪切层不稳定可能是流动紊乱化的重要原因
The introduction of two-dimensional artificial disturbance-induced planar boundary layer transition to modulation, the formation and development of the typical three-dimensional perturbations in the transitional boundary layer were observed using the hydro-bubble flow display in the sink, including the Λ structure, the card vortex and the card- Vortex.The experimental results show the relationship between the ring-shaped vortex and the peak structure, directly confirmed the mechanism of spike structure.The dark spot structure often found in the turbulent boundary layer was found in the initial stage of the turbulent boundary flow.The results show that with the dark The instability of the local high-shear layer associated with plaque may be an important cause of the disturbed flow