Flame acceleration and onset of detonation in inhomogeneous mixture of hydrogen-air in an obstructed channel

Xinyu Zhao; Jiabao Wang; Longkun GaoXujiang WangYuejin Zhu

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Flame acceleration and onset of detonation in inhomogeneous mixture of hydrogen-air in an obstructed channel

机译：Flame acceleration and onset of detonation in inhomogeneous mixture of hydrogen-air in an obstructed channel

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摘要

Flame acceleration (FA) and deflagration-to-detonation transition (DDT) in combustible premixed gases is a complex process involving the flow and combustion phenomena. Practically, the combustible premixed gases are often inhomogeneous. The numerical study aims to explore the effects of different solid obstacle distribution patterns on the FA and DDT process in the inhomogeneous concentration field. Results show that the shape of detonation wave is arc-shaped due to the inhomogeneous hydrogen concentration, and the detonation initiation process can be classified into three types: ⅰ) detonation induced by the coupling of the flame surface and the high-pressure zone; ⅱ) detonation induced by the interaction between flame surface and reflected shock wave; ⅲ) detonation induced by the interaction between the oblique shock wave or Mach stem and obstacles in the flow field. Also, this study finds that the flame evolutions have experienced four velocity augmentation regions before the detonation initiation. Further, the rich hydrogen content in the aperture and the higher unilateral blockage ratio can both promote flame acceleration, and further shorten the run-up time of the DDT.

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来源
《Aerospace science and technology》 |2022年第11期|107944.1-107944.10|共10页
作者
Xinyu Zhao; Jiabao Wang; Longkun GaoXujiang WangYuejin Zhu;
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作者单位

School of Energy and Power Engineering, Jiangsu University, Zhenjiang, 212013, China;

Shenzhen Research Institute of Shandong University, Shenzhen, Guangdong, 518000, China,National Engineering Laboratory for Reducing Emissions from Coal Combustion, Shandong University, Jinan, Shandong, 250067, China;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类
关键词
Inhomogeneous concentration field; Flame acceleration; Combustion; Deflagration-to-detonation transition; Detonation;

Flame acceleration and onset of detonation in inhomogeneous mixture of hydrogen-air in an obstructed channel

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