Asymmetry of imploding detonations in thin channels

IF 1.7 4区 工程技术 Q3 MECHANICS
S. Rodriguez Rosero, J. Loiseau, A. J. Higgins
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引用次数: 0

Abstract

The factors that influence the symmetry of an imploding detonation are investigated experimentally and theoretically. Detonations in sub-atmospheric acetylene–oxygen were initiated and made to converge in an apparatus that followed that of Lee and Lee (Phys Fluids 8:2148–2152, 1965). The width of the test section was controlled with a wave-shaping insert, which formed the test section against the viewing window, creating an effectively two-dimensional problem with a channel width comparable to the detonation cell size. The convergence of the detonation was observed via self-luminous open-shutter photography and high-speed videography. The resulting videos were analyzed to quantify the wave speed, degree of asymmetry, and direction and magnitude of the offset in the center of convergence. To determine the experimental parameters that influence the symmetry of the imploding wave, the wave-shaping insert was intentionally canted by \(0.3 ^{\circ } {\text {--}} 0.6^{\circ }\), accentuating the asymmetry of the imploding detonation. The experiment was modeled using a Huygens construction wherein the detonation is treated as a collection of wavelets, each assumed to propagate locally at a velocity determined by the channel width. The results of the model reproduced the observed offsets in detonation convergence from the center of the apparatus, confirming that velocity deficits resulting from the narrow channel width control the observed asymmetry.

Abstract Image

细通道内爆的不对称性
通过实验和理论研究了影响内爆对称性的因素。在亚大气层乙炔-氧气中引爆,并在一个沿用 Lee 和 Lee(流体物理学 8:2148-2152,1965 年)方法的装置中汇聚。试验段的宽度由波形插件控制,该插件将试验段与观察窗对齐,形成一个有效的二维问题,通道宽度与引爆单元大小相当。通过自发光开启式快门摄影和高速摄像观察起爆的收敛情况。通过对视频进行分析,可以量化波速、不对称程度以及汇聚中心偏移的方向和幅度。为了确定影响内爆波对称性的实验参数,波形插入物被故意倾斜了(0.3 ^{\circ } {\text {--}} 0.6^{\circ }/),突出了内爆爆炸的不对称性。实验采用惠更斯结构建模,其中引爆被视为一个小波集合,每个小波假定以由通道宽度决定的速度局部传播。该模型的结果再现了从仪器中心观察到的起爆收敛偏移,证实狭窄通道宽度造成的速度不足控制了观察到的不对称。
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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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