Turbulent flame augmentation using a fluidic jet for Deflagration-to-Detonation
Turbulent flame augmentation using a fluidic jet for Deflagration-to-Detonation
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DOI：
10.1016/j.fuel.2017.03.023
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发表时间：
2017-07
期刊：
影响因子：
7.4
通讯作者：
J. Chambers;K. Ahmed
中科院分区：
文献类型：
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作者：
J. Chambers;K. Ahmed
爆轰是一种利用总压升高来增加高流动动量和热力学效率的高能量增压燃烧模式。爆轰是通过湍流相互作用驱动火焰加速和诱导爆燃转爆轰（DDT）而引发的。有一个广泛的愿望，解开湍流诱导DDT的物理机制。研究了射流诱导的湍流对湍流加速火焰的作用。调查的目的是分类的湍流火焰动力学和时间演变的火焰阶段在整个湍流制度。利用高速粒子图像测速技术（PIV）和纹影成像技术，在爆轰实验装置上对火焰与流场的相互作用进行了实验研究。分析探讨了局部湍流和火焰加速机制，导致从高层次的湍流运输引起的射流。湍流火焰比层流火焰有更高的火焰加速。湍流火焰在较低的火焰边界中经历湍流强度的高传播。在整个相互作用过程中，涡量生成、速度波动和湍流应变率都会增加。湍流火焰制度的特点是薄到破碎的反应之间的演变。
Detonation is a high energetic mode of pressure gain combustion that exploits total pressure rise to augment high flow momentum and thermodynamic efficiencies. Detonation is initiated through flame acceleration driven by turbulence interaction and induction for Deflagration-to-Detonation Transition (DDT). There is a broad desire to unravel the physical mechanisms of turbulence induced DDT. The study examines the role of turbulence induced by a fluidic jet on turbulent accelerating flames. The investigation aims to classify the turbulent flame dynamics and temporal evolution of the flame stages throughout the turbulent regimes. The flame-flow interactions are experimentally studied in a detonation facility using high-speed particle image velocimetry (PIV) and Schlieren imaging. The analysis explores the local turbulence and flame acceleration mechanisms that result from the high level of turbulent transport induced by the jet. Higher flame acceleration is observed for the turbulent flame relative to the laminar flame. The turbulent flame experiences high propagation of turbulence intensities in the lower flame boundary. An increase in vorticity generation, velocity fluctuation, and turbulent strain-rate is experienced throughout the interaction. The turbulent flame regime is characterized showing an evolution between the thin-to-broken reactions.