The use of planar laser-induced fluorescence (PLIF) of nitric oxide (NO) was investigated for use in visualizing wake flowfields downstream of rapid prototyping models in a hypersonic wind tunnel. The re-entry models for use in this study were fabricated using a stereo-lithography apparatus. These models were produced in one day or less, which is a significant time savings compared with the manufacture of ceramic or metal models. The models were tested in the NASA Langley Research Center 31-Inch Mach 10 Air Tunnel. Pure NO was either seeded through tubes plumbed into the model or via a tube attached to the strut holding the model, which provided localized addition of NO into the model's wake through a porous metal cylinder attached to the end of the tube. Various entry capsule model types and configurations and NO-seeding methods were used, including a new streamwise visualization method based on PLIF. Virtual diagnostics interface technology, developed at NASA Langley Research Center, was used to visualize the datasets in post-processing. The use of calibration 'dotcards' was investigated to correct for camera perspective and lens distortions in the PLIF images.


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    Title :

    Fluorescence imaging and streakline visualization of hypersonic flow over rapid prototype wind-tunnel models


    Additional title:

    Fluoreszenzabbildung und Stromlinienvisualisierung der hypersonischen Strömung über schnelle Prototyp-Windkanal-Modelle


    Contributors:
    Danehy, P.M. (author) / Alderfer, D.W. (author) / Inman, J.A. (author) / Berger, K.T. (author) / Buck, G.M. (author) / Schwartz, R.J. (author)


    Publication date :

    2008


    Size :

    15 Seiten, 20 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English