探索自制二元烟火的反应性
Chengbo Ru1,2,3, Lihong Chen1,2,3, Hongguo Zhang1,2,3
1College of Forensic Science, Criminal Investigation Police University of China, Shenyang, 110854, China.
Scientific reports
|November 11, 2024
概括
自制烟火的反应性取决于氧化剂,颗粒大小和密度. 纳米粒子和酸增强反应能力,而增加密度可能会降低性能,影响即兴爆炸装置分析.
科学领域:
- 爆炸性科学和技术
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
背景情况:
- 自制爆炸装置 (IED) 经常使用自制烟火,因为对常规爆炸物的限制.
- 烟火的反应性对于理解爆炸动态至关重要,并受材料特性和操作条件的影响.
- 高效的热量和质量转移是烟火技术性能的关键.
研究的目的:
- 研究氧化剂类型,颗粒大小和加载密度对基火器反应性的影响.
- 探索这些自制炸药的热力学,加压和燃烧传播行为.
- 在爆炸调查中,为损害评估和电荷参数的逆计算提供洞察力.
主要方法:
- 热力学,加压特性和燃烧传播的实验测试.
- 氧化物物种 (例如,酸,酸,甲酸,甲) 和颗粒大小 (微型与纳米) 的系统变化.
- 对加载密度对传热方式和反应动力学影响的分析,得到NASA-CEA代码计算的支持.
主要成果:
- 基于酸的烟火表现出最高的反应性,其特点是快速加压率 (dp/dt) 和短的燃烧持续时间.
- 由于热量和质量转移的增强,纳米粒子 (nAl) 与微粒子 (mAl) 相比,表现出更高的反应性.
- 在一个值以上增加负载密度将热传输从对流转移到导流,显著降低加压和传播速度 (vp).
- 理论计算表明,加载密度改变反应路径,根据氧化剂不同影响压力输出.
结论:
- 氧化剂的选择,颗粒的大小和加载密度是控制火工反应的关键参数.
- 基于纳米粒子的烟火技术提供了增强的性能,但需要仔细控制密度.
- 这些发现对法医分析有价值,有助于评估爆炸现场和确定爆炸性电荷特征.
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