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Visualization of Muzzle Flow and Projectile in Flight Flow Using the Background Oriented Schlieren Technique

ABDELHAFIDH MOUMEN, JURGEN GROSSEN, IRÈNE NDINDABAHIZI, JOHAN GALLANT

Abstract


The present paper focuses on the development of a non-intrusive measurement technique and the implementation of a quantitative flow visualization method based on Background Oriented Schlieren (BOS). The gun muzzle flow, the aerodynamics, and the ambient airprojectile interaction are visualized. In BOS, the experimental set-up of conventional Schlieren (mirrors, lenses, and knife-edge) is replaced by a background pattern and a single digital camera. The proposed measurement technique and the implemented algorithm are first validated through the temperature measurement of a flame-induced distorted flow field. An acceptable accuracy is recorded, the measurement error being less than 3-5% of the full scale. Second, the muzzle flow and the flow field around a 5.56 mm projectile in free flight was captured and analyzed. The captured structures such as vortex, barrel shock, Mach disk, and blast wave show a good agreement with those issued from the conventional Schlieren set-up


DOI
10.12783/ballistics2019/33107

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