Research on Detonation and Explosion

爆炸是爆炸介质中化学反应快速释放能量而产生的冲击波。化学工业安全领域对此很感兴趣，因为对意外爆炸造成的风险进行现实评估以及设计抑制和减轻爆炸的方法需要对爆炸现象有很好的了解。爆轰研究也有助于理解可压缩化学反应流，这对高超声速流和先进推进系统的工程师来说非常重要。爆轰研究的突出问题是缺乏确定爆轰前缘不稳定结构的能力。这是为了获得一个长度刻度来表征细胞爆炸的反应厚度。所有动态爆轰参数（即传播速度、起爆能、爆轰极限等）的确定都需要爆轰厚度。本文的研究重点是爆震波的形成和破坏，因为在这些过程中，爆震波的基本传播机制得到了突出的揭示。传播机制是指爆轰结构内部负责爆震波自我持续传播的物理和化学过程。在爆轰形成阶段，传播机制正在发展，而在失效阶段，基本机制正在被破坏。这项工作引起了国防研究机构的爆炸安全工程师和科学家的兴趣。在过去的四十年中，NSERC支持麦吉尔大学的爆炸研究，为建立加拿大在爆炸和引爆领域的国际公认的专业知识做出了贡献。对拟议项目的持续研究有助于保持这种专业知识。

Detonations are shock waves sustained by rapid energy release from chemical reactions in an explosive medium. It is of interest to the field of safety in the chemical industries since realistic assessment of risks due to accidental explosions and the design of explosion suppression and mitigation methods require a good knowledge of the detonation phenomenon. Detonation research also contributes towards the understanding of compressible chemical reacting flows, which is of importance to engineers working in hypersonic flows and on advanced propulsion systems. The outstanding problem of detonation research is the lack of the ability to determine the unstable structure of the detonation front. This is required to obtain a length scale to characterize the reaction thickness of the cellular detonations. The thickness of the detonation is required for the determination of all the dynamic detonation parameters (i.e., propagation velocity, initiation energy, detonation limits, etc.). The proposed research focuses on the investigation of the formation and failure of the detonation wave for it is during these processes that the essential propagation mechanisms are prominently revealed. The propagation mechanisms refer to the physical and chemical processes within the detonation structure that are responsible for the self-sustained propagation of the detonation wave. During the formation phase of the detonation, the propagation mechanisms are being developed, whereas during failure, the essential mechanisms are being destroyed. The proposed work is of interest to explosion safety engineers and scientists in defense research establishments. NSERC supported research on explosions at McGill over the past four decades has contributed to establishing the internationally acknowledged expertise of Canada in the field of explosion and detonation. The continuing research of the proposed program serves to maintain this expertise.