Realization of ultra-low specific impulse loading by synchronous initiation of discrete group of cross ultra-fine explosive rods

DING Yang; LU Qiang; LI Jin; GUO Zhiyun; WANG Zhanjiang

doi:10.11883/bzycj-2022-0314

Volume 43 Issue 5

May 2023

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DING Yang, LU Qiang, LI Jin, GUO Zhiyun, WANG Zhanjiang. Realization of ultra-low specific impulse loading by synchronous initiation of discrete group of cross ultra-fine explosive rods[J]. Explosion And Shock Waves, 2023, 43(5): 054101. doi: 10.11883/bzycj-2022-0314

Citation:

DING Yang, LU Qiang, LI Jin, GUO Zhiyun, WANG Zhanjiang. Realization of ultra-low specific impulse loading by synchronous initiation of discrete group of cross ultra-fine explosive rods[J]. Explosion And Shock Waves, 2023, 43(5): 054101. doi: 10.11883/bzycj-2022-0314

Citation:

DING Yang, LU Qiang, LI Jin, GUO Zhiyun, WANG Zhanjiang. Realization of ultra-low specific impulse loading by synchronous initiation of discrete group of cross ultra-fine explosive rods[J]. Explosion And Shock Waves, 2023, 43(5): 054101. doi: 10.11883/bzycj-2022-0314

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Realization of ultra-low specific impulse loading by synchronous initiation of discrete group of cross ultra-fine explosive rods

doi: 10.11883/bzycj-2022-0314

Northwest Institute of Nuclear Technology, Xi’an 710024, Shaanxi, China

Received Date: 2022-07-19
Rev Recd Date: 2023-01-19

Available Online: 2023-02-21

Publish Date: 2023-05-05

Abstract

Abstract

The loading technology of cosine distributed load by chemical explosion is the main method for evaluating the dynamic response of space structures under the irradiation of high-altitude nuclear explosions with soft X-rays. A loading method of discretely-distributed sheet explosives synchronously detonated by a mild detonating fuse (MDF) network was proposed to meet the design requirements of complex configuration, high synchronicity and low specific impulse load in the structural assessment of new space vehicles. In terms of experimental study, the cross-shaped sheet explosive made by stacking explosive strips with a cross-sectional size of 0.33 mm×0.5 mm can be directly detonated by a mild detonating fuse with the diameter of 0.5 mm. Compared with strip distribution, the space uniformity of cross distribution is improved by 76.7%. A high-speed camera was used to record the shock wave luminescence during the detonation process. The results show that the detonation ratio of the 21-point MDF detonation network reaches 100%, and the detonation asynchrony is less than 1 μs. In terms of numerical simulation, a numerical model for the explosion of sheet explosives was established based on the multi-material arbitrary Lagrangian-Eulerian (ALE) algorithm. The numerical model has strong grid sensitivity, and the results by it tend to converge when the mesh size reaches 0.5 mm, with the deviation from the measured specific impulse results within 5%. Based on the numerically-simulated results, the following conclusions can be drawn. (1) Under the periodic discrete distribution condition, the peak specific impulse is determined by the surface density of the explosive, and the evolution process of the peak specific impulse is determined by the spacing. (2) The homogenization process of specific impulse can be divided into three stages: diffusion stage, superposition stage and uniform stage. The specific impulse is homogenized through free diffusion of shock wave in the diffusion stage, and through shock wave superposition and collision in the superposition stage, and finally enters the uniform stage with relatively uniform distribution. (3) The homogenization distance into the uniform stage required by the arrays of square and short rod explosives is about equal to the spacing of the explosives, while the arrays of cross explosives only need about 0.8 times the spacing, and the degree of homogenization in the uniform stage is higher, so the cross explosive has a greater advantage in the case of plane explosive loading. (4) The loading mode of synchronous initiation of discrete explosive group not only improves the load synchronization, but also improves the load uniformity, compared with the slip detonation loading of rod distributed charge. The structural response distortion caused by the excessive additional mass of rubber can also be avoided by using the air layer between the sheet explosives and the structure to homogenize the load.
- nuclear explosion X-ray,
- sheet explosive,
- plane wave,
- synchronous initiation,
- specific impulse

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References(26)

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