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

爆轰波是自持的超声速燃烧波。这些波可以在包括反应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，期望具有在使用不同缓解策略时对爆震波的最终点燃及其传播极限的预测能力。同样，爆震波的推进应用（例如，旋转爆震发动机、脉冲爆震发动机、倾斜爆震发动机）需要精确控制波的起始和稳定性。对于所有实际目的，爆轰行为需要在米量级的尺度上预测（发动机几何形状、爆轰抑制器、工业设施配置等），而爆震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1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。在工程规模上，目前还不可能充分预测爆震波动力学。实现这种可预测性是我对气体爆炸的长期研究计划的主要目标。

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.