Date of Award
Master of Science in Aeronautical Engineering
Department of Aeronautics and Astronautics
Mark F. Reeder, PhD.
Particle Image Velocimetry (PIV) was successfully conducted in the Air Force Research Lab Mach 3/ Mach 6 Facility (M3M6F) for the first time. Particle response experiments evaluating the performance of dry ice particles across an oblique shock wave were conducted using a 15 degree half-wedge in nominal Mach 3 flow. Solid carbon dioxide particles are generated through rapid expansion of liquid carbon dioxide via a small nozzle within a simple shroud tube or a tube containing static mixing elements. Particles are injected directly into the settling chamber of the Mach 3 tunnel. The particle response of carbon dioxide particles is compared to that of water particles produced from ambient moisture content in the tunnel system. Carbon dioxide particles produced particle response curves indicating particle diameters of approximately 2 microns acclimating to the asymptotic change in velocity across the shock between 25 and 30 mm on a path normal to the shock wave. Ambient water particles had a somewhat faster response acclimating within 20 to 25 mm. Analysis methods in Dantec DynamicStudio 2015a, such as cross correlation in 32x32 pixel and 64x64 pixel Interrogation Regions (IR), were compared to other techniques, namely the Adaptive PIV method and the Least Squares Method. The effects of analysis method on both freestream velocity and particle response were investigated. Other augmentations such as peak validation, Gaussian window functions, and image pre-processing techniques were evaluated using the same performance metrics.
DTIC Accession Number
Gulotta, Paul A., "Particle Image Velocimetry and Analysis Methods Using Cleanly Seeded Particles in Supersonic Flow" (2016). Theses and Dissertations. 479.