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.


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    Title :

    High-Speed PLIF Imaging of Hypersonic Transition over Discrete Cylindrical Roughness


    Contributors:
    Danehy, P. M. (author) / Ivey, C. B. (author) / Inman, J. A. (author) / Bathel, B. F. (author) / Jones, S. B. (author) / McCrea, A. C. (author) / Jiang, N. (author) / Webster, M. (author) / Lempert, W. (author) / Miller, J. (author)

    Conference:

    48th AIAA Aerospace Sciences Meeting ; 2010 ; Orlando, FL


    Publication date :

    2010-01-04


    Type of media :

    Conference paper


    Type of material :

    No indication


    Language :

    English




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