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Research Papers: Flows in Complex Systems

Numerical Investigation of Channel Leak Geometry for Blast Overpressure Attenuation in a Muzzle Loaded Large Caliber Cannon

[+] Author and Article Information
R. A. Carson

US Army/Armament Research,
Development, and Engineering
Center (ARDEC)/Benet Laboratories,
Watervliet Arsenal,
Watervliet, NY 12189

O. Sahni

Mechanical, Aerospace and
Nuclear Engineering Department,
Rensselaer Polytechnic Institute,
Troy, NY 12180

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 13, 2014; final manuscript received July 21, 2014; published online September 10, 2014. Editor: Malcolm J. Andrews.

J. Fluids Eng 137(2), 021102 (Sep 10, 2014) (12 pages) Paper No: FE-14-1133; doi: 10.1115/1.4028123 History: Received March 13, 2014; Revised July 21, 2014

This study examines the effect of channel leak geometry on blast overpressure attenuation in the rear of a muzzle-loaded large caliber cannon. Effects of three primary geometric parameters including leak volume as well as number and length of channels are studied. Reduction in blast overpressure, and thus peak overpressure, is most influenced by the leak volume; however, leak volume needs to be selected carefully to limit the loss in the projectile exit velocity. Modification of the channel height in the current range has a minimal effect on peak overpressure, but the number of channels can have a significant effect due to the constriction experienced by the leaking flow, thereby limiting the attenuation. Two channel lengths are considered where the longer channel length, is found to be more effective. The best configuration showed over 50% reduction in peak overpressure at all monitored locations with about 4.8% loss in the projectile exit velocity.

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Figures

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Fig. 1

Setup of the projectile and propellant

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Fig. 2

Geometric setup for the parametric study

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Fig. 3

Mesh utilized in numerical simulations

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Fig. 4

Muzzle exit mesh for different configurations

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Fig. 5

Boundary conditions for all simulations

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Fig. 6

Burn rate matching the experimental data of breech pressure

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Fig. 7

Projectile velocity for baseline numerical simulation

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Fig. 8

Schematic of eight positions in the rear of the muzzle

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Fig. 9

Experimental versus numerical results for peak overpressure at monitored locations

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Fig. 10

Baseline normalized velocity over time and point with slope change

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Fig. 11

Peak overpressure for varied leak volumes

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Fig. 12

Normalized pressure versus radial position for heights of 6.7 and 10 calibers above centerline at 0 deg elevation

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Fig. 13

FoM versus leak volume

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Fig. 14

FoM versus number of channels for a constant leak volume and two channel lengths

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Fig. 15

Precursor shock structure for the baseline, CLM(7.5)(4)(6.7), and CLM(7.5)(8)(6.7)

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Fig. 16

Pressure over a line that is 1 caliber above the tube centerline

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Fig. 17

Primary shock structure for the baseline, CLM(7.5)(4)(6.7), and CLM(7.5)(8)(6.7)

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Fig. 18

Trace of shock structure at 10 calibers

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Fig. 19

Pressure over a line that is 1 caliber above the tube centerline for the primary shock

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Fig. 20

Pressure versus time for position two for the baseline, CLM(7.5)(4)(6.7), and CLM(7.5)(8)(6.7)

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