A Novel Scheme for Computing Gun Barrel Temperature History and Its Experimental Validation

Abstract

An accurate modeling of gun barrel temperature variation over time is important to assess wear and the number of shot fires needed to reach cook-off. Using lumped parameter methods, an internal ballistics code was developed to compute heat transfer to the gun barrel for given ammunition parameters. Subsequently the finite element method was employed to model gun barrel temperature history (temperature variation over time). Simulations were performed for a burst of nine shots and the results were found to match satisfactorily to the corresponding experimental measurements. Wear or erosion of the barrel during a gun fire is very sensitive toward the maximum bore surface temperature. The proposed scheme can accurately simulate gun barrel temperature history; hence improved wear calculations can be made with it. An important and unique advantage of the developed scheme is that it easily couples internal ballistics simulations with the finite element methods.

Modeling and Simulation of Heat Transfer Phenomena

“…Subsequently the finite element method was employed to model gun barrel temperature history (temperature variation over time). Simulations were performed for a burst of nine shots and the results were found to match satisfactorily to the corresponding experimental measurements" [92]. An important and unique advantage of the developed scheme is that it easily couples internal ballistics simulations with the finite element methods and also accurately calculates gun barrel temperature history and wear calculations.…”

Estimation of the Time-Varying High-Intensity Heat Flux for a Two-Layer Hollow Cylinder

“…The direct problem of the heat transfer process defined by Equations (1)-(6) is concerned with the determination of the gun barrel transient temperature field when the geometry, thermal properties, and conditions at all boundaries are known. The heat balance method and tri-diagonal matrix algorithm are applied to obtain the numerical solutions of Equations (1)- (6). The temperature sensor is embedded on the outer wall surface to record the temperature change, denoted by (T k N ) mea .…”

“…In essence, the time-varying heat flux q(t) on the inner wall is regarded as the only unknown in Equations (1)- (6). The present inverse problem is to estimate the unknown boundary heat flux q(t) by utilizing some measured temperature and other known boundary conditions and properties.…”

“…Furthermore, Sun et al [5] have studied the transient temperature response of a hollow cylinder subjected to periodic boundary conditions and investigated the effects of different parameters on the maximum temperature of the inner surface. Mishra et al [6] proposed a new scheme for computing gun barrel temperature variation with time by coupling the internal ballistics code and finite element model. In their study, heat flux to the gun bore surface was determined from the computed results of internal ballistics code (GUMTEMP8.EXE) and is approximated as an exponentially decaying form.…”

Analysis of heat transfer coefficient inside gun barrel

“…Mishra et al(2010), presented the numerical approach too calculated the rate of heat transfer and calculated the transient temperature profile using this approach. He then validated using experimental approach using vented vessel experimental setup.…”