Predictability of detonation wave dynamics in gases: experiment and model development

爆轰波是一种自持的超音速燃烧波。这些波可以在包括反应性气体在内的大多数高能介质中持续存在。因此，对于安全应用，当使用不同的缓解策略时，希望能够预测最终引爆的爆震波及其传播极限。同样，爆轰波的推进应用(如旋转爆震发动机、脉冲爆震发动机、斜爆轰发动机)需要准确控制波的起爆和稳定性。出于所有实际目的，爆轰行为需要在米的尺度上进行预测(发动机几何形状、防爆器、工业设施配置等)，而爆轰波厚度现象发生在与分子平均自由程相当的尺度上，即小于一微米。因此，爆炸现象是一个固有的多尺度问题，具有多尺度物理学。爆震波动力学的充分可预测性目前在工程规模上是不可能的。实现这样的可预测性是我关于气体爆炸的长期研究计划的主旨。

Detonation waves are self-sustained supersonic combustion waves. These waves can be sustained in most energetic media including reactive gases. For safety applications, it is thus desirable to have the predictive capability for the eventual ignition of a detonation wave and for its propagation limits when different mitigation strategies are used. Likewise, propulsion applications of detonation waves (e.g., rotating detonation engines, pulse-detonation engine, oblique detonation engine) require accurate control of the wave initiation and stability. For all practical purposes, the detonation behavior needs to be predicted on scales on the order of meters (engine geometry, detonation arrestors, industrial facility configuration, etc...), whereas the detonation wave thickness phenomena occur at scales comparable to the molecular mean free path, i.e. less than a micron. The detonation phenomenon is thus an inherent multi-scale problem, with multi-scale physics. Adequate predictability of detonation wave dynamics is not currently possible at engineering scales. Achieving such predictability is the main thrust of my long-term research program on gaseous detonations.