Cook-off analysis of a propellant in a 7.62 mm barrel by experimental and numerical methods

Işık, Halil; Göktaş, Fatih

doi:10.1016/j.applthermaleng.2016.10.104

Cited by 18 publications

(5 citation statements)

References 10 publications

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“…where T S is temperature of the inside medium of the barrel, T in is temperature at the inner surface of the barrel, ε is the emissivity of the barrel surface having the value of 0.85 13 and σ is Stefan-Boltzmann constant (5.67 . 10 -8 W/m 2 K 4 ).…”

Section: Geometry and Theoretical Modelmentioning

confidence: 99%

“…A general combustion equation for the propellant is present in Eqn (10) 31 and the combustion equations for each propellant ingredient are presented in Eqns (11)(12)(13)(14)(15)(16).…”

Section: Calculation Of the Heat Convection Coefficients Inside And Outside The Barrelmentioning

confidence: 99%

“…Convection coefficient outside of the barrel has been found as 13.4W/m 2 K by the correlation given in Eqn (33) 13,34 . Outside air velocity was assumed as 10km/h.…”

Section: Calculation Of the Heat Convection Coefficients Inside And Outside The Barrelmentioning

confidence: 99%

“…They presented temperature and stress distributions on the barrel. Işık and göktaş 13 inversely found inner heat flux by the measured temperature values on the combustion chamber. They also investigated the effects of time interval between two magazines, number of cartridges in magazines, thicknesses of combustion chamber and cartridge case on cook-off time.…”

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Modelling and Simulation of a 120 mm Smoothbore Gun Barrel During Interior Ballistics

Susantez

Caldeira²

2022

Def. Sc. J.

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Understanding the heat transfer phenomenon during interior ballistics and consequently presenting a realistic model is very important to predict the temperature distribution inside the cannon barrel, which influences the gun wear and the cook-off. The objective of this work is to present a new detailed numerical model for the prediction of thermal behaviour of a cannon barrel by combining PRODAS interior ballistics simulation with COMSOL simulation. In this study, a numerical model has been proposed for the heating behaviour of a 120 mm smoothbore cannon barrel, taking into account the combustion equation of the JA-2 propellant. Temperature dependent thermophysical properties of product gases were used for the calculation of the convective heat transfer coefficient inside the barrel. Projectile position, velocity of the projectile, gas temperature inside the barrel, volume behind the projectile and mass fraction during interior ballistics have been obtained by PRODAS software and used in the numerical model performed by COMSOL multiphysics finite element modelling and simulation software. Temperature simulations show that maximum wall temperature inside the cannon barrel is observed after 3 ms from fire, when maximum value of the convective heat transfer coefficient inside the barrel is observed. The results reveal that the convective heat transfer coefficient of burned gases inside the gun has major effect than the burned gas temperature on the heat transfer phenomenon.

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Section: Geometry and Theoretical Modelmentioning

confidence: 99%

“…A general combustion equation for the propellant is present in Eqn (10) 31 and the combustion equations for each propellant ingredient are presented in Eqns (11)(12)(13)(14)(15)(16).…”

Section: Calculation Of the Heat Convection Coefficients Inside And Outside The Barrelmentioning

confidence: 99%

“…Convection coefficient outside of the barrel has been found as 13.4W/m 2 K by the correlation given in Eqn (33) 13,34 . Outside air velocity was assumed as 10km/h.…”

Section: Calculation Of the Heat Convection Coefficients Inside And Outside The Barrelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Heat Transfer Modelling and Simulation of a 120 mm Smoothbore Gun Barrel During Interior Ballistics

Susantez

Caldeira²

2022

Def. Sc. J.

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“…This phenomenon is instead studied in theory [1,2] or verified in practice, on existing weapons, by perfecting tests following NATO D14 Handbook on Evaluation Procedures for Future NATO Small Arms Weapon Systems (AC/225(DSS)-D(2018)0006), in particular, the chapter 2.14 -Cook-off and barrel heating [3]. The aim is to establish the reference temperature from which selfinitiation occurs measured in several rounds that could be fired safely but without making it possible to prevent it.…”

Section: Introductionmentioning

confidence: 99%

Main Electrical Components of an Assault Rifle With Adaptive Mechanism

NICOLESCU,

ROŞCA,

RADULIAN

et al. 2023

RRST-EE

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This paper presents the design, simulation, and experimental validation of a bistable direct current actuator and its electronic control system. Regarding the working principle, the bistable linear actuator is like an electromagnet with two air gaps. The difference between the newly proposed linear actuator and a classical electromagnet is the usage of two Nd-Fe-B permanent magnets to maintain the mobile core in two holding positions. Also, a specially designed electronic control system was developed. This paper aims to explain the actuator’s working principle and its novel electronic control system advantages. This equipment is used in an assault rifle to limit the self-initiation of the cartridge due to barrel heating without the operator pulling the weapon’s trigger. The proposed bistable direct current actuator ensures a short time switching between its two holding positions. The electronic controller measures the temperature of the weapon's barrel with a thermocouple and applies a voltage on the coils to switch between the two holding positions of the actuator. The actuator was developed and analyzed using the FEMM package, and the mechanical parameters were computed with MATLAB. The electronic driver was developed with PCB design software, and the working principle was validated with a circuit analysis program.

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Preparation and performances characterization of HNIW/NTO-based high-energetic low vulnerable polymer-bonded explosive

Jin

Chen

et al. 2019

J Therm Anal Calorim

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Cook-off analysis of a propellant in a 7.62 mm barrel by experimental and numerical methods

Cited by 18 publications

References 10 publications

Heat Transfer Modelling and Simulation of a 120 mm Smoothbore Gun Barrel During Interior Ballistics

Heat Transfer Modelling and Simulation of a 120 mm Smoothbore Gun Barrel During Interior Ballistics

Main Electrical Components of an Assault Rifle With Adaptive Mechanism

Preparation and performances characterization of HNIW/NTO-based high-energetic low vulnerable polymer-bonded explosive

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