Shock ignition of aluminium particle clouds in the low-temperature regime

IF 1.7 4区 工程技术 Q3 MECHANICS
M. Omang, K. O. Hauge
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引用次数: 1

Abstract

In this paper, we present results from spontaneous ignition of aluminium particle clouds in a series of shock tube experiments. For all experiments, the shock propagates along a narrow pile of 40-\(\upmu \)m aluminium particles. The study includes shock Mach numbers in the range from 1.51 to 2.38. The results are visualised using photographic techniques and pressure gauges. The combination of two Phantom high-speed video cameras and a beamsplitter allows a compact schlieren setup mounted together with a dark-film high-speed camera. While the schlieren technique allows the shock features to be identified, the dark-film camera is used to capture the ignition and burning of the aluminium particle clouds. Based on extensive image processing and shock tube relations for reflected shocks, spontaneous ignition of the aluminium particle cloud is found to take place for reflected shock gas temperatures above 635 K. For increasing Mach numbers, we find a decreasing trend for the ignition delay. Additionally, the burning time is observed to decrease with increasing Mach number, indicating that the burning process is more efficient with increasing gas temperature.

Abstract Image

低温条件下铝粒子云的激波点火
本文介绍了一系列激波管实验中铝粒子云自燃的结果。在所有的实验中,冲击波都是沿着一堆40- \(\upmu \)米的铝粒子传播的。研究包括激波马赫数在1.51到2.38之间。使用摄影技术和压力表将结果可视化。两个幻影高速摄像机和一个分束器的组合使得一个紧凑的纹影装置与一个暗胶片高速摄像机安装在一起。纹影技术可以识别冲击特征,而暗胶片相机则用于捕捉铝粒子云的点火和燃烧过程。基于广泛的图像处理和反射冲击的激波管关系,发现当反射冲击气体温度高于635 K时,铝粒子云会发生自燃。随着马赫数的增加,点火延迟有减小的趋势。燃烧时间随马赫数的增加而减小,表明随着燃气温度的升高,燃烧过程效率更高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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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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