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Research Papers

Numerical Simulation and Experimental Study of Flowfield Around a Bullet With a Partial Core

[+] Author and Article Information
Usiel S. Silva, Luis A. Flores, Narcizo Muñoz, Víctor Hernández

 Instituto Politécnico Nacional Escuela Superior de Ingeniería Mecánica y Eléctrica, U. Azcapotzalco, Sección de Estudios de Posgrado e Investigación Av. Granjas 682, Col. Sta. Catarina Azcapotzalco, D.F., C.P. 02250, México

Juan M. Sandoval

 Instituto Politécnico Nacional Escuela Superior de Ingeniería Mecánica y Eléctrica, U. Azcapotzalco, Sección de Estudios de Posgrado e Investigación Av. Granjas 682, Col. Sta. Catarina Azcapotzalco, D.F., C.P. 02250, Méxicojsandovalp@ipn.mx

J. Appl. Mech 78(5), 051020 (Aug 05, 2011) (5 pages) doi:10.1115/1.4004297 History: Received November 26, 2010; Revised May 23, 2011; Published August 05, 2011; Online August 05, 2011

The geometry, density and velocity of a typical small caliber bullet, are the main factors that stabilize its flight path, range and the impact force; thus the weight variations can indicate the presence of geometrical irregularities or damages of the bullet core, affecting its dynamic characteristics. Computational finite element method (FEM) with the computational fluid dynamic (CFD) module was used for the numerical simulation of 7.62 mm bullets with partial core, subjected to different air flow conditions. Schlieren images were obtained and with the flow visualization principle, the behavior of the projectile during its flight path was determined. The results of the simulations and the experiments showed that in certain cases, bullets with partial core maintain a stable spin during flight without a considerable variation in its range, keeping constant speed conditions with respect to the full core bullets. The importance of this analysis is found in the fact that post processing activities can be implemented in certain ammunitions with imperfections to improve their use.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

X-ray images of bullets 7.62 mm FMJ with partial core

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Figure 2

Pressure curve characteristic of 7.62 × 51 mm FMJ ammunitions

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Figure 3

Supersonic flow of smoke over an airfoil bullet 7.62 mm with partial core

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Figure 4

X-ray images of bullets 7.62 mm, (left) FMJ type, (right) without lead core

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Figure 5

Pressure curve characteristic of the 7.62 mm ammunitions with coreless bullets

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Figure 6

Experimental Schlieren of transonic flowfield over an airfoil bullet 7.62 mm

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Figure 7

Numerical Schlieren of transonic flowfield around the 7.62 mm bullet

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Figure 8

Experimental Schlieren of supersonic flowfield over an airfoil bullet 7.62 mm

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Figure 9

Numerical Schlieren of supersonic flowfield around the 7.62 mm bullet

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Figure 10

Experimental Schlieren of transonic flowfield over the 7.62 mm bullet with partial core

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Figure 11

Numerical Schlieren of transonic flowfield over the 7.62 mm bullet with partial core

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Figure 12

Experimental Schlieren of supersonic flowfield over the 7.62 mm bullet with partial core

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Figure 13

Numerical Schlieren of supersonic flowfield over the 7.62 mm bullet with partial core

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