74th Annual Meeting of the APS Division of Fluid Dynamics (November 21, 2021 — November 23, 2021)

P0025: Experimental Streak and Quantitative Schlieren Imaging

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Authors

• David Avalos Violante, New Mexico Tech
• Jason Falls, New Mexico Tech
• Michael Hargather, New Mexico Tech
• Michael Delaney, Naval Air Warfare Center, Weapons Division China Lake

DOI: https://doi.org/10.1103/APS.DFD.2021.GFM.P0025

The density variation around supersonic projectiles are characterized using quantitative high-
speed schlieren photography. This experiment uses a method for acquiring the density variation
using a light-dark boundary. As a projectile passes through the light-dark boundary, a schlieren
effect can be visualized. A streak image is then produced to reconstruct the projectile. A lens-
based schlieren system with a high-speed digital camera recorded images which were used to
obtain density fields via the quantitative schlieren calibration process to serve as a comparison
with the experimental streak image. The projectiles were 10° half-angle sharp cones fired from a
0.50''-caliber barrel. The projectiles were imaged while traveling at approximately 740 m/s, or
Mach 2.10