Thermal loading and heat removal from a sequentially fired railgun

Jamison, K. A.; Petresky, H.L.; Beavers, Fred; Eggers, P.O.; Gunito, S.; Holland, M.M.; Vrable, D.L.

doi:10.1109/20.364669

Cited by 17 publications

(4 citation statements)

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“…The dependent variables to be solved areÃ, V and T. The energy equation (23)(c) will not be solved for the armature because in reality the armature, which has the projectile embedded in it, is in most cases disposable.…”

Section: Mathematical Formulationmentioning

confidence: 99%

“…Jamison et al 23 presented the results including the determination of a simplified thermal time constant. The results obtained with this time constant and experimental data were compared.…”

Section: Introductionmentioning

confidence: 99%

“…An experimental study of the thermal management of a sequentially fired small-scale railgun (30 mm bar) was performed by the Air Force High Energy Railgun Integration Demonstration (HERID) program. Jamison et al 23 presented the results including the determination of a simplified thermal time constant. The results obtained with this time constant and experimental data were compared.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional launch simulation and active cooling analysis of a single-shot electromagnetic railgun

2014

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An electromagnetic railgun is one of the applications of electromagnetic launchers, which are devices used to accelerate projectiles to velocities exceeding those attained with conventional propelling systems. A magnetic field is generated when current flows through two conductive rails connected by a moving armature. The current that passes through the rails exerts an electromagnetic force on the armature and causes it to accelerate to high speeds. In this work, a threedimensional transient model for the thermal and electromagnetic solutions of the launch process is presented. The model accounts for the determination of the current and temperature profiles inside the rails, the projectile movement, and the cooling process after the first launch. Focus is given to the thermal management where five different arrangements, one without cooling and four that include cooling channels, are studied. A 10 to 50 K reduction in the peak temperature was obtained with the inclusion of cooling channels when compared to the no-cooling-channel case. It was also shown that the position and size of these channels can be optimized in order to reduce this peak temperature.

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Section: Mathematical Formulationmentioning

confidence: 99%

“…Jamison et al 23 presented the results including the determination of a simplified thermal time constant. The results obtained with this time constant and experimental data were compared.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Three-dimensional launch simulation and active cooling analysis of a single-shot electromagnetic railgun

2014

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“…Jamison et al present the results of the thermal management systems [2]. A single thermal time constant was determined for the entire rail system.…”

Section: Introductionmentioning

confidence: 99%

Thermal management and resistive rail heating of a large-scale naval electromagnetic launcher

Smith¹,

Ellis²,

Bernardes³

et al.

2004 12th Symposium on Electromagnetic Launch Technology, 2004.

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This paper presents a model that can be implemented to quickly estimate the resistive heating and the resulting transient temperature response. Quantifying the energy deposited in the rails and implementing an effective thermal management system will be key elements of an effective design for a large-scale electromagnetic launcher. The total current was divided between the inside, upper/lower and outside surface based on the results of a current distribution calculation. The diffusion of the magnetic field into each surface was modeled in order to determine the current distribution and the resistive heating. Cooling between shots was taken into account by solving the one dimensional transient heat diffusion equation within each surface. Repeating these calculations for a number of discrete segments down the length of the rail enabled the prediction of the total resistive rail heating and the temperature profile along the length of the rail. Experimental tests were conducted that verify the presence of localized heating in the corners of a U-shape conductor made of 7075 Aluminum. Taking into account the localized resistive heating near the surface of the conductor will become increasingly important with large-scale guns.

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