Propagation Law of Shock Wave jn Z-shaped Diffusion Chamber

doi:10.12382/bgxb.2023.0896

Abstract

Abstract:

In this paper, a three-dimensional numerical calculation model of Z-shaped diffusion chamber is established based on LS-DYNA. The wave dissipation effect of the diffusion chamber under the impact of incident shock wave with different characteristic parameters is discussed, and the influences of different feature sizes of diffusion chamber on the wave dissipation efffect are studied. The results show that the wave dissipation effect of diffusion chamber under the impact of shock wave with short duration is significantly affected, and the wave dissipation effect of diffusion chamber under the impact of shock wave with short duration is 8% higher than that with long duration. The wave dissipation effect of diffusion chamber increases with the peak intensity of incident shock wave, but the improvement in wave dissipation effect is not obvious when the peak intensity of incident shock wave is greater than 0.9MPa. The wave dissipation performance of diffusion chamber is the best when the diffusion ratio and length-to-diameter ratio are 5. The increase in the diffusion ratio of diffusion chamber has a significant influence on its wave dissipation effect. The increase in length-to-diameter ratio has no obvious effect on the wave dissipation effect of diffusion chamber.

Key words: diffusion chamber, shock wave, propagation law, wave dissipation

CLC Number:

O383

WU Zhangjun, WANG Xueming, YU Wenjun, DENG Shuxin, CHEN Jianyu, JIN Dongyan, YU Bingbing. Propagation Law of Shock Wave jn Z-shaped Diffusion Chamber[J]. Acta Armamentarii, 2023, 44(S1): 160-169.

Figures/Tables 17

Fig.1 Three-dimensional numerical modeling of Z-shaped chamber

Table 1 Summary of numerical simulation conditions

序号	入射冲击波的峰值超压/MPa	入射冲击波的持时/ms	扩散比	长径比
1	0.166
2	0.237
3	0.307
4	0.393	10	3	4
5	0.897
6	1.333
7	1.585
8	2.361
9	2.800	100	3	4
10				5
11				6
12			4	4
13				5
14				6
15			5	4
16				5
17				6

Table 2 Material parameters and equation of state parameters of air

C₀/ MPa	C₁	C₂	C₃	C₄	C₅	C₆	V	E/ (J·m^-3)	ρ/ (kg·m^-3)
0	0	0	0	0	0.4	0.4	1.0	0.25	1.29

Table 3 Material parameters and equation of state parameters of TNT

A/GPa	B/GPa	R₁	R₂	ω	V	E₀/(GJ·m^-3)	ρ/(kg·m^-3)	D/(m·s^-1)	P_CJ/GPa
371	3.231	4.5	0.95	0.3	1.0	7	1630	6930	2.7

Table 4 Material parameters and equation of state parameters of z-shaped chamber

RO/(kg·m^-3)	PR	E/(GJ·m^-3)	CMO
7800	0.3	2.599	1.0

Fig.2 Arrangement of measuring points in z-shaped chamber model

Fig.3 Validation of numerical model material parameters

Fig.4 Numerical computational model of long-duration shock waves

Fig.5 Pressure-time curves at the inlet and outlet of the chamber under different durations

Fig.6 Pressure contour of shock wave propagation in z-shaped chamber (shor duration)

Fig.7 Pressure contour of shock wave propagation in z-shaped chamber (long duration)

Fig.8 Diffraction phenomenon generating when shock wave enters the diffusion chamber

Fig.9 Influences of different peak overpressure incident waves on the wave dissipation effect of chamber

Fig.10 Pressur-time curves at the inlets and outlets of chambers with different feature sizes

Table 5 Wave dissipation effects of chambers with different feature sizes

扩散比	长径比	入射冲击波峰值超压/MPa	出口冲击波峰值超压/MPa	消波系数
	4	2.80	0.73	0.74
3	5	2.80	0.63	0.78
	6	2.80	0.89	0.68
	4	2.80	0.55	0.80
4	5	2.80	0.52	0.81
	6	2.80	0.44	0.84
	4	2.80	0.45	0.84
5	5	2.80	0.40	0.86
	6	2.80	0.41	0.85

Fig.11 Influence of diffusion ratio on wave dissipation effect of diffusion chamber

Fig.12 Influence of length-to-diameter ratio on wave dissipation effect of diffusion chamber

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