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Interior Ballistics

Modeling of Interior Ballistic Gas-Solid Flow Using a Coupled Computational Fluid Dynamics-Discrete Element Method

[+] Author and Article Information
Cheng Cheng

e-mail: chengcheny@gmail.com

Xiaobing Zhang

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

1Corresponding author.

Manuscript received June 30, 2012; final manuscript received August 28, 2012; accepted manuscript posted January 7, 2013; published online April 19, 2013. Assoc. Editor: Bo S. G. Janzon.

J. Appl. Mech 80(3), 031403 (Apr 19, 2013) (6 pages) Paper No: JAM-12-1283; doi: 10.1115/1.4023313 History: Received June 30, 2012; Revised August 28, 2012; Accepted January 07, 2013

In conventional models for two-phase reactive flow of interior ballistic, the dynamic collision phenomenon of particles is neglected or empirically simplified. However, the particle collision between particles may play an important role in dilute two-phase flow because the distribution of particles is extremely nonuniform. The collision force may be one of the key factors to influence the particle movement. This paper presents the CFD-DEM approach for simulation of interior ballistic two-phase flow considering the dynamic collision process. The gas phase is treated as a Eulerian continuum and described by a computational fluid dynamic method (CFD). The solid phase is modeled by discrete element method (DEM) using a soft sphere approach for the particle collision dynamic. The model takes into account grain combustion, particle-particle collisions, particle-wall collisions, interphase drag and heat transfer between gas and solid phases. The continuous gas phase equations are discretized in finite volume form and solved by the AUSM+-up scheme with the higher order accurate reconstruction method. Translational and rotational motions of discrete particles are solved by explicit time integrations. The direct mapping contact detection algorithm is used. The multigrid method is applied in the void fraction calculation, the contact detection procedure, and CFD solving procedure. Several verification tests demonstrate the accuracy and reliability of this approach. The simulation of an experimental igniter device in open air shows good agreement between the model and experimental measurements. This paper has implications for improving the ability to capture the complex physics phenomena of two-phase flow during the interior ballistic cycle and to predict dynamic collision phenomena at the individual particle scale.

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Figures

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Fig. 1

Density contour of double Mach reflection of a strong shock

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Fig. 2

Normal force test in the vertical direction under gravity (a) position of particle with elastic force and (b) position of particle with elastic and damping force

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Fig. 3

Schematic diagram of igniter test device in open air

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Fig. 4

Comparison between the calculated and measured pressure-time traces at the P3 location

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Fig. 5

Pressure distributions at different times

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Fig. 6

Particle temperature distributions at different times

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Fig. 7

Porosity distributions at different times

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Fig. 9

Gas velocity vector distributions after vent holes open

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Fig. 10

Particle velocity vector distributions at different times

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Fig. 8

Gas velocity vector distributions before vent holes open

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