氢爆轰通过稀惰性粒子幕的传输
Transmission of hydrogen detonation across a curtain of dilute inert particles
摘要：
采用气固双向耦合的欧拉-拉格朗日方法模拟了氢爆轰波在惰性粒子幕中的传播。详细的化学机理用于氢爆轰燃烧和参数的研究进行了基于二维计算域。绘制了对应于各种颗粒尺寸、浓度和帘厚度的传播和熄灭的爆轰图。结果表明，当颗粒浓度小于临界值时，临界帘幕厚度显著减小。幕厚度上的峰值压力，冲击波阵面速度，和热释放率的轨迹的影响进行了检查。结果表明，爆轰波在颗粒幕中的传播有三种模式：爆轰波传播、部分熄灭和爆轰波再引发以及爆轰波熄灭。化学爆炸模式分析证实，爆轰二次起爆事件是由一个高压力和爆炸倾向的二次起爆点，造成横向冲击聚焦。颗粒直径和浓度的影响，和帷幕厚度上DW的峰值压力轨迹，冲击速度，和相间的能量和动量交换率也检查。此外，通过颗粒速度、体积分数、斯托克斯阻力和阿基米德力分析了幕状结构的演化过程。该分析证实了拖曳力在影响帘形态变化方面的重要性。不同的窗帘演变制度被发现：准静止制度，收缩制度，恒定厚度制度，和膨胀制度。最后，研究了帷幕厚度对帷幕演化特征时间的影响。
英文摘要：
Transmission of hydrogen detonation wave (DW) in an inert particle curtain is simulated using the Eulerian-Lagrangian approach with gas-particle two-way coupling. A detailed chemical mechanism is used for hydrogen detonative combustion and parametric studies are conducted based on a two-dimensional computational domain. A detonation map of propagation and extinction corresponding to various particle sizes, concentrations, and curtain thicknesses is plotted. It is shown that the critical curtain thickness decreases considerably when the particle concentration is less than the critical value. The effects of curtain thickness on the trajectories of peak pressure, shock front speed, and heat release rate are examined. Three propagation modes of the DW in particle curtain are found: detonation transmission, partial extinction and detonation reinitiation, and detonation extinction. The chemical explosive mode analysis confirms that a detonation re-initiation event is caused by a re-initiation point with high pressure and explosive propensity, resulting from transverse shock focusing. The influence of particle dimeter and concentration, and curtain thickness on the DW are also examined with peak pressure trajectories, shock speed, and interphase exchange rates of energy and momentum. Furthermore, the evolutions of curtain morphologies are analyzed by the particle velocity, volume fraction, Stokes drag and Archimedes force. This analysis confirms the importance of the drag force in influencing the change of curtain morphologies. Different curtain evolution regimes are found: quasi-stationary regime, shrinkage regime, constant-thickness regime, and expansion regime. Finally, the influences of the curtain thickness on the characteristic time of curtain evolutions are studied.
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