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实验研究角区层流边界层三维定常分离附着鞍点拓扑结构的存在性及其演化规律.二维粒子图像测速(PIV,Particle Image Velocimetry)激光片光源设置于给定平板和不同模型组成的角区对称面,采用微距镜头捕捉对称面奇点附近的局部流动拓扑结构.实验证实在一定流动参数条件下多种形状模型与平板形成的角区均存在有别于经典分离的附着鞍点拓扑结构;随着雷诺数增加或者随着模型钝度的变化,附着鞍点拓扑结构与经典分离鞍点拓扑结构之间存在着一定的演化规律;对附着鞍点拓扑结构与Lighthill经典三维分离模式的关系进行了分析,表明Lighthill经典三维分离模式也适用于分析附着鞍点拓扑结构.
Experimental study on the existence and evolution of the topological structure of the three-dimensional stationary saddlepoint in the laminar boundary layer in the corner region.PIV (Particle Image Velocimetry) laser light source is set on the corner of a given plate and different models The local flow topology near the singularity point of the symmetry plane is captured by a macro lens.The experiments show that there are different topological structures of attachment saddle point different from the classical separation under the condition of certain flow parameters and the angular region formed by the flat plate, With the increase of Reynolds number or the change of bluntness of the model, there exists a certain law of evolution between the topological structure of attachment saddle and the topological structure of classical separation saddle. The relationship between topological structure of attachment saddle and Lighthill classic three- It shows that the Lighthill classical 3D separation mode is also suitable for analyzing attachment saddle topology.