Numerical Research on the Power Field of Two-point Array Explosion with Different Spatial Intervals in Air

doi:10.12382/bgxb.2023.0279

Abstract

Abstract:

In order to explore the characteristics of explosive power field formed by simultaneously detonated two explosives with different spatial intervals in infinite air space, a numerical model of two-point explosives with different spacing distances in free field air explosion is established to numerically study the two-point array explosion. The shock wave parameters of each space point in the calculation domain are obtained, and the contours of equal damage region based on overpressure and impulse criteria are drawn, respectively. The geometric characteristics of iso-surface with the change of space distance are studied. Results show that the pressure enhancement effect and multi-peak effect are the main reasons for the reconstruction of explosive power field. With the increase of the separation distance, the equal damage region of two-point explosion field presents three typical shapes. Compared with single point explosion, the volume of two-point explosion power field and the coverage area in specific direction only have gains in the range of partial separation distance. The relevant research conclusions related to the separation distance and criterion threshold can provide a reference for the study of multi-point array explosion power field characteristics and the design of multi-bomb cooperative combat mode. As the most basic mode of array explosion, these results can provide a reference for the study of multi-point array explosion power field characteristics and the design of multi-bomb cooperative combat mode.

Key words: shock wave, interaction, array explosion, power field

CLC Number:

O382

ZHENG Jian, MAO Zhiyuan, ZHANG Daixin, HU Hongwei, SONG Pu. Numerical Research on the Power Field of Two-point Array Explosion with Different Spatial Intervals in Air[J]. Acta Armamentarii, 2023, 44(12): 3590-3600.

Figures/Tables 18

Table 1 JWL equation of state parameters for TNT[18]

ρ₀ /(kg·m^-3)	A/GPa	B/GPa	R₁	R₂	ω	E/GPa
1630	373.8	3.747	4.15	0.9	0.35	6.0

Table 2 Equation of state parameters for air

ρ₀ /(kg·m^-3)	γ	E/MPa
1.225	1.4	0.2068

Fig.1 Calculation model of free-field explosions

Fig.2 Comparison of calculated results of overpressure

Fig.3 Comparison of calculated resulrs of pressure histories

Fig.4 Calculation model of two-point explosion

Fig.5 Typical shock wave propagation process of two-point array explosion (D=2.76m/kg1/3)

Fig.6 Shadowgraphs of shock wave interactions[4]

Fig.7 The positions of gauges

Fig.8 Typical pressure-time curves of two-point array explosion

Fig.9 Contours of equal damage region at different separation distance for overpressure (Δpf=0.076MPa)

Fig.10 3-D view of overpressure contour surface(Δpf=0.076MPa)

Fig.11 Changing trends of the volumes and effect radius of contour surface of overpressure(Δpf=0.076MPa)

Fig.12 Contours of specific impulse contour surface (i=0.059MPa·ms)

Fig.13 3-D view of impulse contour surface (i=0.059MPa·ms)

Fig.14 Changing trends of the volumes and effect radius of specific impulse contour surface(i=0.059MPa·ms)

Fig.15 Impulse-time cueves at different gauge points

Fig.16 Boundaries of different contour types due to the change of overpressure threshold

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