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

Moumen, Abdelhafidh; Grossen, Jurgen; Ndindabahizi, I.; Gallant, Johan

doi:10.12783/ballistics2019/33107

Cited by 3 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides, the study of the flow around the projectile is necessary to optimize its design and for its trajectory computation. These topics are currently attracting renewed interest in ballistic research given the evolution of the type of threat, such as urban combat, and the need to engage the target at greater distances (the precision projectile will perform part of its flight in the transonic range) [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantitative Investigation of Ballistics Flow Fields by Background Oriented Schlieren Technique

Moumen

Laboureur

Gallant

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

The ballistics field is known by the presence of several complex phenomena such as muzzles 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 capture the main characteristics of the studied configurations: Firstly, we discuss the visualization and the density field reconstruction around a Bullet Simulated Projectile BSP flying at supersonic velocities and a sniper projectile flying at supersonic and transonic velocities. We demonstrate that these fields are in satisfactory agreement with the results of Taylor and Maccoll’s equation and 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, 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.

show abstract

Section: Introductionmentioning

confidence: 99%

“…The muzzle flows consist of two distinct features [3,4,6]: Firstly, the precursor flow, essentially composed of air, drove outwards of the barrel by a piston effect. Indeed, the in-bore acceleration of the projectile induces compression waves that merge into a normal shock wave.…”

Section: Introductionmentioning

confidence: 99%

Quantitative Investigation of Ballistics Flow Fields by Background Oriented Schlieren Technique

Moumen

Laboureur

Gallant

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

show abstract

“…As an alternative to the lack of quantitative experimental data as well as the inconvenience of intrusive measurement techniques, quantitative optical techniques represent a suitable approach to measure various fluid quantities such as density and velocity. In this context, in a previous series of works, Moumen et al [1,34,35] demonstrated the suitability of the Background Oriented Schlieren (BOS) technique as a quantitative investigation tool in the intermediate ballistics field.…”

Section: Introductionmentioning

confidence: 99%

On the Quantitative Investigation of the Intermediate Ballistics: Velocity Measurement of the Muzzle Flow

MOUMEN¹,

STIRBU²,

GROSSEN³

et al. 2022

Proceedings of the 32nd International Symposium on Ballistics

View full text Add to dashboard Cite

In the context of intermediate ballistics, a thorough understanding of the muzzle flow is necessary to optimize the design of muzzle devices and long-range projectiles. However, due to the harsh environment, the extremely short duration, and the transient evolution of the intermediate ballistics phase, both experimental and flow modeling efforts are hampered by the lack of quantitative experimental data. In this study, a Particle Imaging Velocimetry (PIV) experimental set-up is implemented to quantitatively investigate the muzzle flow based on its velocity. This tool has the advantage of obtaining a non-intrusive and whole-field diagnostic, both qualitatively and quantitatively. The first part of the study explains that PIV is suitable for measuring the velocity fields of the muzzle flow. This was achieved by using the naturally present particles in the gas as tracers. We demonstrate that the raw PIV images revealed that the structure of this flow is composed of two regions. The first region is located within the under-expanded jet and consists of spatially dispersed particles. The second region, downstream of the Mach disk, is formed by large structures. We show that cross-correlation and particle tracking velocimetry (PTV) algorithms can determine the flow velocity in both regions. In the second part, we present a quantitative description of the muzzle flow issued from the launch of a subsonic .300 Blackout projectile. The results show that these gases reach a maximum centerline velocity of more than 900 m/s inside the shock bottle. At the barrel exit plane, the gases start to discharge with a velocity close to that of the projectile’s launch velocity, accelerating it. In the third part, we present a detailed comparison between the aforementioned flow and the flow resulting from the launch of a supersonic projectile. Differences and similarities are pronounced and explained. The presented set-up and the description of the whole flow field velocity would serve as valuable improvements toward muzzle devices optimization and numerical code validation.

show abstract

Use of regular patterns-based background oriented schlieren imaging and digital image correlation for visualization of convective airflow

Sasono,

Sakti,

Noor

et al. 2024

THERMOFLUID XII: The 12th International Conference on Thermofluids 2021

View full text Add to dashboard Cite

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

Cited by 3 publications

References 0 publications

Quantitative Investigation of Ballistics Flow Fields by Background Oriented Schlieren Technique

Quantitative Investigation of Ballistics Flow Fields by Background Oriented Schlieren Technique

On the Quantitative Investigation of the Intermediate Ballistics: Velocity Measurement of the Muzzle Flow

Use of regular patterns-based background oriented schlieren imaging and digital image correlation for visualization of convective airflow

Contact Info

Product

Resources

About