Interior Ballistic Simulation for 9 mm Gun for Bullet and Blank Shot Applying Spalart-Allmars Turbulence Model

Internal ballistic for a bullet shot and a blank shot in a 9 mm gun were simulated. The length and the thickness of the barrel of the gun were 125 mm and 3 mm, respectively. In this simulation viscous Spalart-Allmars turbulence model was applied and the movement of the bullet was modeled with six de...

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Bibliographic Details
Published in:Romanian Journal of Acoustics and Vibration 2022-12, Vol.19 (2), p.75-85
Main Authors: Tavana, Mohammad Sadeh Pir, Alavi, Seyed Aboul-hassan, Rahmati, Sadegh, Fazeli, Hamid
Format: Article
Language:English
Subjects:
Acoustics
Ballistics
Compressed air
Energy
Finite volume method
Fluid dynamics
Gas pressure
Gases
Geometry
Initial conditions
Mach number
Reduction
Shootings
Simulation
Sound pressure
Supersonic flow
Turbulence models
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Summary:Internal ballistic for a bullet shot and a blank shot in a 9 mm gun were simulated. The length and the thickness of the barrel of the gun were 125 mm and 3 mm, respectively. In this simulation viscous Spalart-Allmars turbulence model was applied and the movement of the bullet was modeled with six degrees of freedom. Four different initial conditions for the bullet were considered that involved the initial position of the bullet in the barrel, pressure of gas behind the bullet, and speed of the bullet in that position. The simulated muzzle speed for each initial condition was compared to experimental data and the error (in %) for each initial condition was calculated. Also, the Mach number, gas pressure, flow field, and sound pressure level were simulated in the area outside of the gun barrel. The sound level was reduced in both axial and radial directions but the reduction of sound in the radial direction was more than in the axial direction. In the case of the blank shot, also, it was observed that the reduction of sound in the radial direction was more than the sound reduction in the axial direction. The sound pressure level for the bullet shot at the muzzle was 239.7 dB and for the blank shot, it was 220.5 dB at the muzzle. In both bullet and blank shots, it is observed from simulations that at the muzzle of the gun pressure of gas dropped and speed increased significantly. The Mach number outside of the barrel was more than 1, which means the flow of gas was supersonic, and in some regions, the Mach number reached 6. The shock wave produced from the supersonic flow of gas is detectable in the simulations.
ISSN:1584-7284
2602-0351