Development of a 3D numerical methodology for fast prediction of gun blast induced loading

Costa, Emiliano; Lagasco, Fabrizio

doi:10.1007/s00193-013-0461-8

Cited by 5 publications

(6 citation statements)

References 3 publications

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“…The GUNWave3D tool 33 provides the distribution of peak incident overpressure P ¯ I , peak reflected overpressure P ¯ R , time of arrival t a , duration of the positive phase τ , and specific (incident or reflected) impulse I I , R upon the wall surface surrounding the gun in the function of the firing configuration (train and elevation angles) and weapon characteristics. These latter can be determined from previous experience, experiments, or, otherwise, predicted on the basis of the knowledge of some key weapon characteristics and propellant properties at firing using the Lagrangian interior ballistic theory.…”

Section: Gunwave3d Model Descriptionmentioning

confidence: 99%

“…where r is the distance from the muzzle to the field point, l ′ is the effective scaling length, a ∞ is the sound speed at ambient conditions, F ( Z ) is a sixth-degree polynomial function, and θ is the angle between the vector r and the unit vector u defining the direction of the barrel. 33…”

Section: Gunwave3d Model Descriptionmentioning

confidence: 99%

“…In order to validate whether the coupling of the proposed method is coherent, the correctness of the application in the hydrocode case of the blast load calculated through the in-house tool, already tackled by Costa, 41 was verified. To this end, the transient gun blast loads set up using the parameters gained with the in-house tool validation 33 were employed. Such data specifically refer to experimental measurements available in the literature and regard a firing configuration of a 30-mm XM230 Chain Gun cannon.…”

Section: Coupled Approach Descriptionmentioning

confidence: 99%

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Assessment of a coupled approach to determine the stress caused by gun blast loads

Costa

2019

Journal of Defense Modeling & Simulation

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This paper aims at assessing a custom numerical procedure built to predict the level of stress in the structural components and equipment in proximity of a cannon-like weapon system when firing. In such a blast scenario, the structures adjacent to a gun may undergo sudden and unwanted damages, since they are commonly subjected to the blast load due to the impingement and propagation of the shock waves expanding from the weapon muzzle. The proposed procedure pertains the coupled use of an in-house developed tool (GUNWave3D) based on the power-law scaling technique and a general-purpose commercial fast dynamic solver to compute the structural response of the loaded components. The in-house tool, in particular, allows one to rapidly calculate the blast parameters over the surfaces of the items of interest in the function of the weapon characteristics and launch conditions, also accounting for the asymmetric shape characterizing the gun blast wave. Taking as reference the numerical free field peak overpressure profiles of a 30 mm gun, whose blast quantities were already validated in a previously published work, the final stage of the assessment was accomplished. Such an estimation consists of the comparison between the structural stresses calculated using the blast loads predicted through the in-house tool and those computed adopting the free spherical air blast of the tri-nitro-toluene model. This operation has the objective to quantify the discrepancy between the computational results of two Lagrangian techniques that can be alternatively adopted in industrial gun blast design procedures and methodologies.

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Section: Gunwave3d Model Descriptionmentioning

confidence: 99%

Section: Gunwave3d Model Descriptionmentioning

confidence: 99%

Section: Coupled Approach Descriptionmentioning

confidence: 99%

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Assessment of a coupled approach to determine the stress caused by gun blast loads

Costa

2019

Journal of Defense Modeling & Simulation

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“…The US Army's Ballistic Research Laboratory (BRL) has developed a prediction method for muzzle devices [32] based on gathered experimental data on muzzle devices for distances from 10 to 50 calibers from the muzzle [33][34][35]. Helliker and other scientists [16,27,[36][37][38][39][40][41][42] investigated many different muzzle devices including a silencer.…”

Section: Introductionmentioning

confidence: 99%

Force and Sound Pressure Sensors Used for Modeling the Impact of the Firearm with a Suppressor

et al. 2020

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In this paper, a mathematical model for projectiles shooting in any direction based on sensors distributed stereoscopically is put forward. It is based on the characteristics of a shock wave around a supersonic projectile and acoustical localization. Wave equations for an acoustic monopole point source of a directed effect used for physical interpretation of pressure as an acoustic phenomenon. Simulation and measurements of novel versatile mechanical and acoustical damping system (silencer), which has both a muzzle break and silencer properties studied in this paper. The use of the proposed damping system can have great influence on the acoustic pressure field intensity from the shooter. A silencer regarded as an acoustic transducer and multi-holes waveguide with a chamber. Wave equations for an acoustic monopole point source of a directed effect used for the physical interpretation of pressure as an acoustic phenomenon. The numerical simulation results of the silencer with different configurations presented allow trends to be established. A measurement chain was used to compare the simulation results with the experimental ones. The modeling and experimental results showed an increase in silencer chamber volume results in a reduction of recorded pressure within the silencer chamber.

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“…The reflection of a supersonic propellant gas jet on a flat wall always occurs during the firing of the weapon system of aircraft (see Figure ). The reflection induces complex shock waves and complex combustion phenomenon. It is of great importance to investigate the initiation mechanism of the combustion in the supersonic propellant gas jet.…”

Section: Introductionmentioning

confidence: 99%

Study on the Initiation Mechanism of Non‐Premixed Shock Induced Combustion in Supersonic Propellant Gas Jet

Qin

Zhang

2019

Propellants Explo Pyrotec

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The reflection of a supersonic propellant gas jet always happens during the firing of the weapon system of aircraft. The reflection induces complex non‐premixed shock induced combustion. It is of great importance to investigate the initiation mechanism of the combustion in the supersonic jet of propellant gas. The mechanism is vital for the design of any suppression method of the secondary combustion. To investigate the combustion in the reflected supersonic jet, a solid propellant combustion model and a numerical model based on compressible multispecies Navier‐Stokes equations are established. A detailed reaction mechanism consisting of 9 species and 12 reactions is utilized for the combustion of the propellant gas. Based on the models, the supersonic precursor flow field and the supersonic propellant gas jet flow are obtained and discussed. A secondary jet is observed which has not been reported before. A sandwich structure is proposed to reveal the initiation of the combustion. The oxygen supply in the secondary jet is found to be dominated by a vortex. An inert gas atmosphere can be adopted to suppress the mass transfer at the contact surface. Special devices could be designed to suppress the formation of the vortex in the secondary propellant jet.

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Development of a 3D numerical methodology for fast prediction of gun blast induced loading

Cited by 5 publications

References 3 publications

Assessment of a coupled approach to determine the stress caused by gun blast loads

Assessment of a coupled approach to determine the stress caused by gun blast loads

Force and Sound Pressure Sensors Used for Modeling the Impact of the Firearm with a Suppressor

Study on the Initiation Mechanism of Non‐Premixed Shock Induced Combustion in Supersonic Propellant Gas Jet

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