Flame acceleration and deflagration-to-detonation transition in micro- and macro-channels: An integrated mechanistic study

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• 作者：Wenhu Han^a ; ^b ; Yang Gao^a ; ^c ; Chung K. Law^a ; ^d ; ^{cklaw@princeton.edu}
• 关键词：Detonation ; DDT ; Micro-/macro-channels
• 刊名：Combustion and Flame
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：176
• 期：Complete
• 页码：285-298
• 全文大小：6359 K
• 卷排序：176

文摘

The integrated processes of flame acceleration, deflagration-to-detonation transition (DDT), and the resulting detonation propagation in micro- and macro-scale channels are simulated. It is found that the modes of flame acceleration and DDT in these two channels are different, being primarily controlled by viscosity and turbulent flame development, respectively. Furthermore, while boundary layer ignition is crucial for DDT in both channels, viscous wall friction is the key to self-sustained propagation in micro-channels, leading to momentum loss and consequently deficit of the detonation velocity. In macro-channels, the strong overdriven detonation decays and gradually evolves into the Chapman–Jouguet detonation.