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Interior Ballistics

Interior Ballistic Modeling and Simulation for Different Charge Zones in Modular Charge System

[+] Author and Article Information
Xiaobing Zhang

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

1Corresponding author.

Contributed by Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANICS. Manuscript received June 30, 2012; final manuscript received August 25, 2012; accepted manuscript posted January 7, 2013; published online April 19, 2013. Assoc. Editor: Bo S. G. Janzon.

J. Appl. Mech 80(3), 031404 (Apr 19, 2013) (6 pages) Paper No: JAM-12-1284; doi: 10.1115/1.4023314 History: Received June 30, 2012; Revised August 25, 2012; Accepted January 07, 2013

The modular charge is developed to replace the conventional bagged charge systems for many advantages. In the interior ballistic cycle of a modular charge system, the nonsimultaneous ignition of propellant in different cases results in an increasing pressure wave, and can cause a launch safety problem of the gun. Because the charge structure is complicated, it is hard to simulate the interior ballistics process for the modular charge system currently. To simulate the interior ballistic of the modular charge system more accurately, an improved interior ballistic one-dimensional two phase flow model for modular charge system is established. The improvement of this model lies in that it takes account of the discontinuity of the propelling charge bed, the block of the cartridge wall to the flame spreading in propelling charge bed, effects of modular cartridge movement to the interior ballistic performance, the nonsimultaneous breakup of the modular charge cartridges, the ignition of the propelling charge in different cartridges, and flame spreading through the cap of the core tubes. Simulation for a full charge and three lower charge cases with different charge position were carried out based on the model. The simulation results proved that the model is reliable, and can be used to study the effects of cartridge mechanical properties, charge position, different charge zones on interior ballistic performance of modular charges.

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Figures

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Fig. 1

Cartridge cases of the modular charge system

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Fig. 2

Internal structure of the modular charge system

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Fig. 3

Pressure history at different position

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Fig. 4

Pressure difference of the numerical result

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Fig. 5

The displacement and the velocity of the modular cartridges

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Fig. 6

The porosity distribution at different times

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Fig. 7

The pressure distribution at different times

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Fig. 8

Porosity distribution at different times after the projectile has started moving

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Fig. 9

Pressure distribution at different time

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Fig. 10

Charge structures for simulation

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Fig. 11

Pressure history of charge case (a)

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Fig. 12

Pressure difference of charge case (a)

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Fig. 13

Pressure history of charge case (c)

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Fig. 14

Pressure difference of charge case (c)

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Fig. 15

Pressure history of charge case (d)

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Fig. 16

Pressure difference of charge case (d)

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