Research on Detonation and Explosion

爆炸是指爆炸介质中化学反应迅速释放能量所产生的冲击波。这是化学工业安全领域感兴趣的问题，因为对意外爆炸风险的现实评估和爆炸抑制和缓解方法的设计需要对爆炸现象有很好的了解。爆轰研究还有助于理解可压缩化学反应流动，这对于从事高超声速流动和先进推进系统工作的工程师来说是重要的。爆轰研究的突出问题是缺乏确定爆轰波阵面不稳定结构的能力。这是获得用于表征蜂窝爆炸反应厚度的长度标尺所必需的。确定所有的动态爆轰参数(即传播速度、起爆能量、爆轰极限等)都需要爆轰厚度。本文的研究重点是研究爆轰波的形成和破坏，因为在这些过程中，基本的传播机制才会被突出地揭示出来。传播机制指的是爆轰结构内负责自持传播爆轰波的物理和化学过程。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。爆炸安全工程师和国防研究机构的科学家对拟议的工作感兴趣。NSERC在过去40年里支持了对麦吉尔爆炸的研究，为确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。对拟议方案的持续研究有助于保持这一专业知识。

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.