Detonation Wave Propagation in Double‐layer Cylindrical High Explosive Charges

Zhang, Xianfeng; Huang, Zhengxiang; Qiao, Liang

doi:10.1002/prep.201000004

Cited by 21 publications

(12 citation statements)

References 19 publications

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“…In the numerical calculation, the asymmetry of the shaped charge caused by the manufacturing and assembly process is ignored, and established a two-dimensional axisymmetric calculation model. The Lee-Tarver equation of state is used in the overdriven detonation process of explosives [ 1 , 27 ]. Since some parameters of the Lee-Tarver equation are fitted in the (cm, g, μs) unit system, so the calculation model adopts the (cm, g, μs) unit system.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…When the performance of wave shaper is poor, detonation waves in DLSC can also propagate in the form of horn waves, which reduce the incidence angle of the detonation wave on liner surface, and then collide with each other at the axis to form overdriven detonation. Overdriven detonation wave formed in OSC will eventually decay into a steady spherical wave propagation, while the axis of DLSC can always remain in the overdriven detonation state [ 1 , 2 ].…”

Section: Introductionmentioning

confidence: 99%

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The EFP Formation and Penetration Capability of Double-Layer Shaped Charge with Wave Shaper

et al. 2020

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Detonation waves will bypass a wave shaper and propagate in the form of a horn wave in shaped charge. Horn waves can reduce the incidence angle of a detonation wave on a liner surface and collide with each other at the charge axis to form overdriven detonation. Detection electronic components of small-caliber terminal sensitive projectile that are limited by space are often placed inside a wave shaper, which will cause the wave shaper to no longer be uniform and dense, and weaken the ability to adjust detonation waves. In this article, we design a double-layer shaped charge (DLSC) with a high-detonation-velocity explosive in the outer layer and low-detonation-velocity explosive in the inner layer. Numerical and experimental simulation are combined to compare and analyze the forming process and penetration performance of explosively formed projectile (EFP) in DLSC and ordinary shaped charge (OSC). The results show that, compared with OSC, DLSC can also adjust and optimize the shape of the detonation wave when the wave shaper performance is poor. DLSC can obtain long rod EFPs with a large length-diameter ratio, which greatly improves the penetration performance of EFP.

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Section: Numerical Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The EFP Formation and Penetration Capability of Double-Layer Shaped Charge with Wave Shaper

et al. 2020

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“…When the incident angle of the detonation wave is below the critical angle for Mach reflection, regular reflection occurs, and the pressure at the colliding point is 2.4 times the Chapman‐Jouguet (CJ) pressure. Meanwhile, when the incident angle is above the critical angle, Mach reflection occurs, and the pressure behind the Mach wave decreases from four times the CJ pressure to normal CJ pressure with increasing incident angle 10, 11. Therefore, overdriven detonation is produced when a wave shaper is embedded in charge; the pressure behind the overdriven detonation wave is related to the incident angle of the detonation wave.…”

Section: Introductionmentioning

confidence: 99%

Mach Wave Control in Explosively Formed Projectile Warhead

Zhu

Huang

2014

Propellants Explo Pyrotec

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A Mach wave emerges at the top of the liner when a wave shaper is embedded in charge, and thus seriously breaks the explosively formed projectile (EFP) nose. Thus, to avoid breakage at the EFP nose, the pressure behind the Mach wave should be controlled. An analytical model for calculating Mach wave parameters is presented based on three‐shock theory. The parameters of Mach waves, such as their growth angles and radii, their velocity along the plane of symmetry, and the pressure behind them, can be determined. Calculation results show that when the diameter of the wave shaper is reduced or the distance between the wave shaper and liner increases, the incident angle of the detonation wave at the top of the liner increases and thereby lowers the pressure behind the Mach wave. Avoiding the occurrence of Mach waves by reducing the incident angle fails to avoid breakage at the nose of the EFP, but lowering the pressure behind the Mach wave by increasing the incident angle avoids breakage at the nose of the EFP. Calculation and simulation results are validated through X‐ray imaging experimentation.

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“…Mach stem formation was observed in the course of the calibration of convergent flow in Hull's detonation wave reflection experiments [10,11]. Zhang et al [12] used an analytical model and numerical simulations to investigate the regular and Mach reflection during the detonation wave propagation in double-layer cylindrical high-explosive charges. The pressure, flow velocity and specific volume were calculated and the Mach stem height was determined from mass conservation in the flow field.…”

Section: Introductionmentioning

confidence: 99%

Theoretical and Experimental Study on Detonation Wave Propagation in Cylindrical High Explosive Charges with a Wave-shaper

Jian¹,

Zhang²,

He³

et al. 2016

Cent. Eur. J. Energ. Mater.

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Abstract:The use of a cylindrical high-explosive charge with a wave-shaper is an efficient way to obtain an ultra-high pressure and a convergent detonation wave. An analysis of flow fields corresponding to the regular and Mach reflection of detonation waves in a cylindrical high-explosive charge with a wave-shaper is presented in this paper. The pressure, flow velocity and triple point growth angle of the Mach stem were calculated. The Mach stem height was also determined by using the modified Whitham method. The results show that the Mach stem height rises from zero at the critical angle of Mach reflection and changes to the Chapman-Jouguet detonation state with the propagation of the detonation waves. Shock indentation experiments were conducted, in which a wave-shaper was used in a cylindrical high-explosive charge to form Mach reflection detonation waves. The results showed that the discrepancy between the experimental results and the theoretical calculations was less than 15%, which proves the validity of the proposed theoretical model.

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Detonation Wave Propagation in Double‐layer Cylindrical High Explosive Charges

Cited by 21 publications

References 19 publications

The EFP Formation and Penetration Capability of Double-Layer Shaped Charge with Wave Shaper

The EFP Formation and Penetration Capability of Double-Layer Shaped Charge with Wave Shaper

Mach Wave Control in Explosively Formed Projectile Warhead

Theoretical and Experimental Study on Detonation Wave Propagation in Cylindrical High Explosive Charges with a Wave-shaper

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