Wyniki wyszukiwania - BazTech

1

Study on the Trend in Evolution of the Energy Flow in the Axis of Annular Booster Pellets

Xue Zhong-qing, He Jing, Cao Xiong, Zhang Jun

Central European Journal of Energetic Materials

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2023

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Vol. 20, no. 3

302-317

EN

In order to further understand the detonation characteristics of annular booster pellets, the energy convergence effect from the detonation wave on the central axis was investigated by using the segmentation and lower end surface output. The result shows that in the whole explosion process, the power exportation capability (N) of the converging energy flow into the central axis increases, then decreases, and then increases and finally decreases. When the collision incidence angle of the detonation waves (or shock waves) reaches a critical value (φcr), Mach reflection occurs at the position on the central axis from the upper end face, as expressed by the formula hc = Lg·tanφcr at time t. The pressure at the collision point rises abruptly to the maximum pressure with a maximum of the power capacity. The segmentation and lower end face output opens up a new test method for the optimal design of the special-shaped booster explosive.

2

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

Pan J., Zhang X., He Y., Deng Q., Guan Z.

Central European Journal of Energetic Materials

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2016

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Vol. 13, no. 3

658--676

EN

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.

3

Modification of the elementary Mach reflection theory of an oblique shock wave at a rigid wall

Łęgowski Z.

Journal of Technical Physics

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1998

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Vol. 39, no 1

67-75

EN

A modified version of the local theory of an oblique shock wave reflection at a rigid surface is presented, known as the elementary theory of Mach reflection (ETMR). Modification concerns solutions for pressure acting on the wall in the region adjacent to the Mach stem front. A good agreement is obtained with Henrych's [11] and Glasstones's [12] data, and with Henderson's [13] measurements, in a wide range of the incident wave intensities as well as in the whole range of its irregular interaction. The theory enables to remove the wall known paradoks of Mach reflection observed so far in the range of weak shock waves reflections, according to the classification introduced by von Neumann [4].