爆炸冲击波在变向通道中传播规律数值模拟

doi:10.12382/bgxb.2023.0889

摘要/Abstract

摘要：

基于LS-DYNA软件对单次变向通道内TNT爆炸进行模拟以验证利用LS-DYNA模拟的准确性,研究了变向角度θ和曲率半径R对变向通道内冲击波传播规律的影响。研究结果表明,当θ和R较小时,θ和R的变化对通道变向处冲击波参数的变化影响较大,对于远场处的影响较小;当θ为90°、R为0mm时,通道内变向处外壁面所受压力是内壁面所受压力的2.17倍;随着θ的增大,反射冲击波超压峰值减小,冲击波能量分配趋于变向后通道,远场处超压峰值先减小后增大;随着R的增加,冲击波在变向处的反射现象不明显,反射冲击波的超压峰值低;随着θ和R的增加,外壁面与内壁面所受反射压力超压峰值之差减小;当θ和R分别增加到一定程度时,改变θ和R对整个通道内冲击波参数变化的影响并不明显,但外壁面压力仍然略高于内壁面压力。

关键词: 冲击波传播规律, 变向通道, 爆炸力学, 超压峰值, 数值模拟

Abstract:

Based on the LS-DYNA software, a single TNT explosion in a turning tunnel is simulated to verify the accuracy of the simulation using LS-DYNA, and the effects of the variable angle θ and the radius of curvature R on the propagation law of shock wave in the turning tunnel are studied. The results show that, when θ and R are small, the changes of θ and R have a greater effect on the changes of shock wave parameters at the tunnel deflection, and the effect is smaller at the far field; when θ is 90° and R is 0mm, the pressure on the outer wall surface at the deflection in the tunnel is 2.17 times of the pressure on the inner wall surface. With the increase of θ, the peak overpressure of the reflected shock wave decreases, and the energy distribution of the shock wave tends to change to the back tunnel, and the peak overpressure at the far field decreases first and then increases; with the increase of R, the reflection phenomenon of the shock wave at the change of direction is not obvious, and the peak overpressure of the reflected shock wave is low; and with the increase of θ and R, the difference between the peak overpressures of the reflected pressures received by the outer wall surface and the inner wall surface decreases. When θ and R are increased to a certain degree, respectively, the effect of changing θ and R on the change of shock wave parameters in the whole tunnel is not obvious, but the pressure on the outer wall surface is still slightly higher than that on the inner wall surface.

Key words: blast wave propagation, turning tunnel, explosive mechanics, overpressure peak, numerical simulation

中图分类号:

O383

余雯君, 陈胜云, 邓树新, 于冰冰, 晋冬艳. 爆炸冲击波在变向通道中传播规律数值模拟[J]. 兵工学报, 2023, 44(S1): 180-188.

YU Wenjun, CHEN Shengyun, DENG Shuxin, YU Bingbing, JIN Dongyan. Numerical Simulation of the Propagation Law of Explosion Shock Wave in Turning Tunnel[J]. Acta Armamentarii, 2023, 44(S1): 180-188.

图/表 14

表1 空气材料参数和状态方程参数

Table 1 Air material parameters and Equation of state parameters

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

表2 TNT炸药材料参数和状态方程参数

Table 2 TNT explosive material parameters and equation of state parameters

A/GPa	B/GPa	R₁	R₂	ω	V₀	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

图1 测点示意图

Fig.1 Schematic diagram of measuring points

图2 数值模拟与经验公式对比

Fig.2 Comparison of numerical simulation and empirical formulas

图3 直通道中不同测点压力时程曲线

Fig.3 Pressure time history curves of different measuring points in a straight tunnel

图4 直通道内压力云图

Fig.4 Pressure nephogram in a straight tunnel

图5 90°变向通道内压力云图

Fig.5 Pressure nephogram in a 90 ° turning tunnel

图6 R=0时测点3、5处冲击波超压时程曲线

Fig.6 Time history curve of shock wave overpressure at measuring points 3 and 5 for R=0

图7 120°和150°变向通道内压力云图

Fig.7 Pressure nephograms in the 120° and 150° turning directional tunnels

图8 反射冲击波对变向处内外壁面压力影响

Fig.8 Impact of reflected shock waves on the pressures on the inner and outer walls at the change of direction

图9 反射冲击波对变向处测点压力影响

Fig.9 Impact of reflected shock wave on pressure at the measuring point in the direction of change

图10 R=1000mm变向通道内压力云图

Fig.10 Pressure nephogram in R=1000mm turning

图11 变向角度θ对超压峰值的影响

Fig.11 Impact of angle of change θ on peak overpressure

图12 曲率半径R/r对超压峰值的影响

Fig. 12 Effect of curvature radius R/r on peak overpressure

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