Visualization of the structure of supersonic turbulent boundary layers
Visualization of the structure of supersonic turbulent boundary layers
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DOI：
10.1007/bf00195099
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发表时间：
1995-02
影响因子：
2.4
通讯作者：
M. Smith;A. Smits
中科院分区：
文献类型：
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作者：
M. Smith;A. Smits
对两个平板零压力梯度超音速边界层进行了一系列流动显示。两种不同的附面层的中等马赫数分别为2.8和2.5，Re θ分别为82，000和25，000。采用了一些新的可视化技术。一种是在刀刃平面采用“选择性截止”的传统纹影的变体。用这种技术生成了流动的运动图像。同时，还采用了液滴播种技术对流动进行了标记，并拍摄了高速影片以显示结构的演变。还拍摄了静态照片以显示大规模运动中的细节。最后，瑞利散射被用来构建平面图像的流动。总之，这些技术提供了关于超音速流中边界层中出现的大尺度运动的特征和运动学的详细信息。使用这些数据，与现有的热线数据相一致，提出了一些建议，关于“平均”大尺度运动的特点。
A series of flow visualizations has been performed on two flat-plate zero-pressure-gradient supersonic boundary layers. The two different boundary layers had moderate Mach numbers of 2.8 and 2.5 andReθ's of 82, 000 and 25, 000 respectively. A number of new visualization techniques were applied. One was a variation of conventional schlieren employing “selective cut-off” at the knife edge plane. Motion pictures of the flow were generated with this technique. Droplet seeding was also used to mark the flow, and high speed movies were made to show structure evolution. Still pictures were also taken to show details within the large-scale motions. Finally, Rayleigh scattering was used to construct planar images of the flow. Together, these techniques provide detailed information regarding the character and kinematics of the large-scale motions appearing in boundary layers in supersonic flow. Using these data, in concert with existing hot-wire data, some suggestions are made regarding the characteristics of the “average” large-scale motion.