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Numerical simulation of serial launch process of multiple projectiles considering the aftereffect period

Qiao Luo (School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing, China)
Xiaobing Zhang (School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing, China)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 7 August 2017

Abstract

Purpose

The numerical simulation of the serial launch process of multiple projectiles is an important engineering problem. However, the projectiles’ motion law is hard to obtain completely only by interior ballistic model. The muzzle flow field affects the projectiles’ velocities when the projectiles pass through it. Also, the propellant gas from previous projectiles may decelerate the later projectiles. Therefore, the aftereffect period should be simulated together with the interior ballistic process of multiple projectiles when researching the serial launch process for accurate motion law of the projectiles.

Design/methodology/approach

The computational fluid dynamics (CFD) software is used to simulate the muzzle flow field. A one-dimensional two-phase reaction flow model is implemented in a computational code for the numerical simulation of gas-solid two-phase reaction flow, during the serial launch process. The computational code is coupled with CFD software by a user-defined function.

Findings

Compared with the first projectile, the formation process of the shock bottle of the second projectile is different. After the projectile head flies out of the muzzle, the projectile head pressure decreases rapidly, but then, it is not always equal to 0.1 MPa. After the projectiles leave the muzzle, the velocity increments of each projectile are mainly determined by muzzle pressure.

Originality/value

This paper presents a prediction tool to understand the projectiles’ motion law during the serial launch process of the multiple projectiles considering aftereffect period, and can be used as a research tool for future ballistic studies of a serial launch system of multiple projectiles.

Keywords

Citation

Luo, Q. and Zhang, X. (2017), "Numerical simulation of serial launch process of multiple projectiles considering the aftereffect period", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 27 No. 8, pp. 1720-1734. https://doi.org/10.1108/HFF-04-2016-0151

Publisher

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Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited