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Exterior Ballistics

Numerical Simulation and Analysis of the Muzzle Flow During the Revolving Barrel Gun Firing

[+] Author and Article Information
Xiaobing Zhang

e-mail: zhangxb680504@163.com
School of the Energy and Power Engineering,
Nanjing University of Science and Technology,
Nanjing 210094, PRC

1Corresponding author.

Manuscript received June 30, 2012; final manuscript received September 4, 2012; accepted manuscript posted January 9, 2013; published online April 19, 2013. Assoc. Editor: Bo S. G. Janzon.

J. Appl. Mech 80(3), 031602 (Apr 19, 2013) (6 pages) Paper No: JAM-12-1285; doi: 10.1115/1.4023338 History: Received June 30, 2012; Revised September 04, 2012; Accepted January 09, 2013

The revolving barrel gun is the principal component of the close-in weapons system (CIWS) that provides important terminal defense against anti-ship cruise missiles that have penetrated fleet defenses. The muzzle flow field of the revolving barrel firing is extraordinarily complex. The 3D computational model was formulated to illustrate the details of the flow field produced by the revolving barrel gun firing. The algorithm of a second order monotone upstream-centered schemes (MUSCL) approach with the advection upstream splitting method (AUSM) solver was used to simulate the high pressure muzzle flow field. The interior ballistic process was coupled with the simulation. The predicted muzzle velocity and maximum bore pressure were in good agreement with those measured in gun firing. Moreover, the muzzle flow field was obtained during the revolving barrel firing and was subsequently analyzed. The maximum lateral velocity of the first and second projectile fired was about 1.6 and 3.8 m/s.

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Figures

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Fig. 1

The mesh of the projectile and the barrel

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Fig. 2

Mach number at 1.38 ms after projectile exit

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Fig. 3

Mach number distribution around the muzzle after the first projectile exit

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Fig. 4

Mach number distribution around the muzzle after the second projectile exit

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Fig. 5

Reference locations near the muzzle

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Fig. 6

Time histories of the pressure at location a1 / b1 / c1

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Fig. 7

Time histories of the pressure at location a2 / b2 / c2

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Fig. 8

The front view pressure contours of muzzle flow at 1.5 ms after the projectile exit

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Fig. 9

Pressure-time curve of location a2 at different revolving speeds

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Fig. 10

Pressure-time curve of location b2 at different revolving speeds

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Fig. 11

Mach number distributions after the second projectile exited

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Fig. 12

Pressure distribution on the second projectile profile (a) front view (b) top view

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Fig. 13

Lateral velocity-time curve of the first projectile

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Fig. 14

Lateral velocity-time curve of the second projectile

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