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.
Fluorescence imaging and streakline visualization of hypersonic flow over rapid prototype wind-tunnel models
Fluoreszenzabbildung und Stromlinienvisualisierung der hypersonischen Strömung über schnelle Prototyp-Windkanal-Modelle
2008
15 Seiten, 20 Quellen
Article (Journal)
English
Strömungslehre , Fluoreszenz , hypersonische Strömung , angewandte Forschung , NASA (National Aeronautics and Space Administration) , Stickstoffoxid , schnelle Prototypentwicklung , Visualisierung , Wirbelfluss , Nachlaufströmung , Stromlinie , Windkanal , Strömungsfeld , Mach-Zahl , Kapsel , Laseranregungsmethode
SAGE Publications | 2008
|Fluorescence Visualization of Hypersonic Flow Over Rapid Prototype Wind-Tunnel Models AIAA Paper
British Library Conference Proceedings | 2007
|