The effects of flame generated turbulence for turbulent-induced deflagration to detonation transition
The effects of flame generated turbulence for turbulent-induced deflagration to detonation transition
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DOI：
10.1016/j.proci.2022.09.068
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发表时间：
2022-11
影响因子：
3.4
通讯作者：
R. Hytovick;Cal J. Rising;A. Morales;Tommy Genova;Joshua Berson;K. Ahmed
中科院分区：
文献类型：
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作者：
R. Hytovick;Cal J. Rising;A. Morales;Tommy Genova;Joshua Berson;K. Ahmed
湍流燃烧转爆轰（DDT）过程发生在亚音速火焰与强烈湍流相互作用时，导致自发加速和DDT的开始。在数值模拟中，复杂地推导了支配自燃的机制。这项工作实验探索的条件下，是已知的爆炸引发的前兆。更具体地说，提出的实验调查的作用，火焰产生的压缩作为一个循环，不断放大，直到一个热点的火焰前形成和点燃。该研究通过超高速压力测量相对于其他火焰状态量化压缩，同时通过纹影成像通过密度梯度定性地详细描述火焰产生的压缩。此外，流场测量是量化的整个流动使用同步粒子图像测速（PIV）和OH* 化学发光。从这些测量中提取的湍流波动和火焰速度，以确定火焰产生的压缩开始的反应物条件。总的来说，这些同时进行的高速测量提供了对发生失控过程的火焰和流场特性的详细了解。这项工作最终文件直接流场测量提取的贡献火焰产生的湍流的湍流爆燃爆震过渡过程。
The turbulent deflagration to detonation transition (DDT) process occurs when a subsonic flame interacts with intense turbulence resulting in spontaneous acceleration and the onset of DDT. The mechanisms that govern the spontaneous ignition are deduced intricately in numerical simulations. This work experimentally explores the conditions that are known precursors to detonation initiation. More specifically, the experiment presented investigates the role of flame-generated compression as a cycle that continuously amplifies until a hotspot forms on the flame front and ignites. The study quantifies the compression comparatively against other flame regimes through ultra-high speed pressure measurements while qualitatively detailing flame generated compression through density gradients via schlieren imaging. Additionally, flow field measurements are quantified throughout the flow using simultaneous particle image velocimetry (PIV) and OH* chemiluminescence. The turbulence fluctuations and flame speeds are extracted from these measurements to identify the reactant conditions where flame-generated compression begins. Collectively, these simultaneous high-speed measurements provide detailed insight into the flame and flow field characteristics where the runaway process occurs. This work ultimately documents direct flow field measurements to extract the contribution of flame-generated turbulence on the turbulent deflagration to detonation transition process.