The evolution of fast turbulent deflagrations to detonations
The evolution of fast turbulent deflagrations to detonations
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DOI：
10.1063/5.0144663
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发表时间：
2023-04
影响因子：
4.6
通讯作者：
R. Hytovick;J. Chambers;Hardeo Chin;V. Gamezo;A. Poludnenko;K. Ahmed
中科院分区：
文献类型：
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作者：
R. Hytovick;J. Chambers;Hardeo Chin;V. Gamezo;A. Poludnenko;K. Ahmed
我们利用先进的实验技术来探索氢-空气混合物中的连续性诱导的燃烧转爆轰（tDDT）。我们分析了整个序列的湍流火焰的发展，从快速爆燃爆震使用同时直接测量的压力，湍流，火焰，冲击和流速。我们表明，快速湍流火焰，加速和发展冲击的特点是湍流火焰的速度，超过查普曼-朱盖爆燃速度与tDDT理论和直接数值模拟（DNS）的结果。速度和压力的演变提供了详细的管理机制，驱动湍流火焰加速。湍流火焰的速度和波动进行检查，以揭示tDDT过程的流场特性。这项工作有助于理解的基本机制，负责快速湍流火焰自发起爆。
We use advanced experimental techniques to explore turbulence-induced deflagration-to-detonation transition (tDDT) in hydrogen–air mixtures. We analyze the full sequence of turbulent flame evolution from fast deflagration-to-detonation using simultaneous direct measurements of pressure, turbulence, and flame, shock, and flow velocities. We show that fast turbulent flames that accelerate and develop shocks are characterized by turbulent flame speeds that exceed the Chapman–Jouguet deflagration speed in agreement with the tDDT theory and direct numerical simulation (DNS) results. Velocity and pressure evolutions are provided to detail the governing mechanisms that drive turbulent flame acceleration. Turbulent flame speeds and fluctuations are examined to reveal flow field characteristics of the tDDT process. This work contributes to the understanding of fundamental mechanisms responsible for spontaneous initiation of detonations by fast turbulent flames.