Detonation propagation through a diffuse-interface gas layer

IF 1.7 4区 工程技术 Q3 MECHANICS
M. McLoughlin, V. Yousefi-Asli, S. Gray, G. Ciccarelli
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Abstract

Detonation propagation in a stratified layer of combustible gas over an inert gas was investigated experimentally. The layer formed in a 12.7-mm-wide channel by opening a sliding door that initially separated a nitrogen-diluted stoichiometric hydrogen–oxygen mixture from argon, or nitrogen. As the lighter combustible gas layer spreads axially down the channel, diffusion across the interface produces a composition gradient across the layer height. A steady detonation wave, generated by deflagration-to-detonation transition in the driver section before the door location, was transmitted into the combustible layer. The axial distance the layer spreads and the amount of mass diffusion across the layer were controlled by the flame ignition delay time after the door opens. Schlieren video and soot foils were used to measure the extent of detonation propagation through the layer. It was shown that detonation propagation through the layer is self-limiting due to over-mixing at the layer leading edge. Three-dimensional numerical simulations, including viscous and multicomponent mass diffusion effects, predicted the composition distribution within the layer. The cell size distribution, calculated based on the theoretical ZND induction zone length, corresponding to the simulation composition distribution showed that a cell size gradient-based failure criterion successfully predicted the extent of propagation in the layer.

Abstract Image

通过扩散界面气体层的爆轰传播
实验研究了在惰性气体上可燃气体层中的爆轰传播。通过打开一个滑动门,最初将氮稀释的化学计量氢-氧混合物与氩气或氮气分开,在一个12.7毫米宽的通道中形成了这一层。当较轻的可燃气体层沿通道轴向扩散时,沿界面扩散产生沿层高的成分梯度。门前驱动段爆燃-爆轰过渡产生的稳定爆轰波传入可燃层。层的轴向扩散距离和层间质量扩散量受门打开后火焰点火延迟时间的控制。用纹影视频和烟灰箔测量了爆轰通过该层的传播程度。结果表明,由于层前缘的过度混合,爆轰在层内的传播是自限的。三维数值模拟,包括粘性和多组分质量扩散效应,预测了层内成分分布。基于理论ZND诱导区长度计算的胞元尺寸分布与模拟组成分布相对应,表明基于胞元尺寸梯度的失效准则成功地预测了层内的传播程度。
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来源期刊
Shock Waves
Shock Waves 物理-力学
CiteScore
4.10
自引率
9.10%
发文量
41
审稿时长
17.4 months
期刊介绍: Shock Waves provides a forum for presenting and discussing new results in all fields where shock and detonation phenomena play a role. The journal addresses physicists, engineers and applied mathematicians working on theoretical, experimental or numerical issues, including diagnostics and flow visualization. The research fields considered include, but are not limited to, aero- and gas dynamics, acoustics, physical chemistry, condensed matter and plasmas, with applications encompassing materials sciences, space sciences, geosciences, life sciences and medicine. Of particular interest are contributions which provide insights into fundamental aspects of the techniques that are relevant to more than one specific research community. The journal publishes scholarly research papers, invited review articles and short notes, as well as comments on papers already published in this journal. Occasionally concise meeting reports of interest to the Shock Waves community are published.
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