| タイトル | High-Speed PLIF Imaging of Hypersonic Transition over Discrete Cylindrical Roughness |
| 本文（外部サイト） | http://hdl.handle.net/2060/20100003405 |
| 著者（英） | McCrea, A. C.; Danehy, P. M.; Lempert, W.; Webster, M.; Meyer, T.; Jiang, N.; Bathel, B. F.; Inman, J. A.; Jones, S. B.; Miller, J.; Ivey, C. B. |
| 著者所属（英） | NASA Langley Research Center |
| 発行日 | 2010-01-04 |
| 言語 | eng |
| 内容記述 | In two separate test entries, advanced laser-based instrumentation has been developed and applied to visualize the hypersonic flow over cylindrical protrusions on a flat plate. Upstream of these trips, trace quantities of nitric oxide (NO) were seeded into the boundary layer. The protuberances were sized to force laminar-to-turbulent boundary layer transition. In the first test, a 10-Hz nitric oxide planar laser-induced fluorescence (NO PLIF) flow visualization system was used to provide wide-field-of-view, high-resolution images of the flowfield. The images had sub-microsecond time resolution. However these images, obtained with a time separation of 0.1 sec, were uncorrelated with each other. Fluorescent oil-flow visualizations were also obtained during this test. In the second experiment, a laser and camera system capable of acquiring NO PLIF measurements at 1 million frames per second (1 MHz) was used. This system had lower spatial resolution, and a smaller field of view, but the images were time correlated so that the development of the flow structures could be observed in time. |
| NASA分類 | Fluid Mechanics and Thermodynamics |
| レポートNO | AIAA Paper 2010-0703
LF99-8827 |
| 権利 | Copyright, Distribution as joint owner in the copyright |
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