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On the Application of Background Oriented Schlieren Technique on Ballistics Field

par Moumen, Abdelhafidh ;Laboureur, Delphine ;Gallant, Johan;Hendrick, Patrick
Editeur scientifique Magin, Thierry ;Christelle, Debeer
Référence 12th Symposium of VKI PhD Research 2022, Review of the VKI Doctoral Research 2020-2021, von Karman Institute for Fluid Dynamics, Rhode-Saint-Genèse
Publication Publié, 2022

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Résumé :

The ballistics field is known by the presence of several complex phenomena such as muzzle and flying projectiles flow fields. Consequently, numerical simulations are commonly used to model these complicated flows. However, the validation process of these codes has proven to be problematic due to the lack of experimental quantitative data. In this context, the present paper describes the application of the Background Oriented Schlieren technique (BOS) as a quantitative investigation tool in the ballistics field. We illustrate that BOS can accurately capturethe main characteristics of the studied configurations: Firstly, we discuss the visualization and the density field reconstruction around a sniper projectile flying at supersonic and transonic velocities. We demonstrate that these fields are in satisfactory agreement with numerical simulation. Then, the findings of the BOS visualization of the precursors and the propellant flow fields are presented. To this end, the salient features accurately captured by the BOS technique such as vortex rings, shock bottles, Mach disk, and blast wave are described both qualitatively and in terms of density profiles. Two improved approaches that are essential to the aforementioned analysis are proposed: the first is related to density field reconstruction based on Abel inversion and the second approach is a phase separation procedure.