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Research Papers: Heat Transfer Enhancement

Transient Thermal Analyses of Midwall Cooling and External Cooling Methods for a Gun Barrel

[+] Author and Article Information
Avanish Mishra

Department of Mechanical Engineering and Mining Machinery Engineering, Indian School of Mines Dhanbad, Jharkhand 826004, Indiaavanish.ism@gmail.com

Amer Hameed

Weapon Systems and Engineering Dynamics Group, DA-CMT, Cranfield University, Shrivenham, Swindon, Wilts, SN6 8LA, UKahameed.cu@defenceacademy.mod.uk

Bryan Lawton

Weapon Systems and Engineering Dynamics Group, DA-CMT, Cranfield University, Shrivenham, Swindon, Wilts, SN6 8LA, UK

J. Heat Transfer 132(9), 091901 (Jun 23, 2010) (8 pages) doi:10.1115/1.4001607 History: Received March 13, 2009; Revised March 16, 2010; Published June 23, 2010; Online June 23, 2010

Liquid cooling methods are often used for thermal management of a large caliber gun barrel. In this work, transient thermal analyses of midwall-cooled and externally cooled gun barrels were performed. At first, a novel simulation scheme was developed for the computation of the gun barrel temperature history (temperature variation over time), and its experimental validation was performed. In the computational scheme an internal ballistics code, GUNTEMP8.EXE , was developed to simulate the total heat transfer per cycle for the given ammunition parameters. Subsequently, a finite element (FE) model of the barrel was developed in ANSYS 11.0. Heat transfer to the barrel was approximated by an exponentially decaying heat flux. The FE model was solved to compute for barrel temperature history. Simulations were performed for a burst of 9 cycles, and the results were found to agree with the experimental measurements. Subsequently, the simulation scheme was extended to analyze a burst of 40 cycles at 10 shots per minute (spm). Three cases were investigated as follows: (1) a naturally cooled gun barrel, (2) a gun barrel with midwall cooling channels, and (3) an externally cooled gun barrel. Natural cooling was found insufficient to prevent cook-off, whereas midwall and external cooling methods were found to eliminate any possibility of it. In the context of a self-propelled howitzer, a midwall-cooled gun barrel connected to an engine cooling system was also analyzed.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cross section of the gun barrel with midwall cooling channels

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Figure 2

Cross section of an externally cooled gun barrel

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Figure 3

Schematic of heat transfer to the gun barrel

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Figure 4

Description of the effective breech face

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Figure 5

Gun barrel cross section and meshed model

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Figure 6

Simulated temperature history of 9 cycles

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Figure 7

Experimental and FEA results of 9 cycles

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Figure 8

Temperature history of the naturally cooled gun barrel

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Figure 9

Temperature history of the midwall-cooled gun barrel

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Figure 10

Temperature history of the externally cooled gun barrel

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Figure 11

Temperature history of the gun barrel utilizing midwall cooling with the engine cooling system

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