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首页> 外文期刊>Combustion and Flame >A study of detonation re-initiation through multiple reflections in a 90-degree bifurcation channel
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A study of detonation re-initiation through multiple reflections in a 90-degree bifurcation channel

机译：在90度分叉通道中通过多次反射重新引发爆轰的研究

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摘要

The aim of this study is to reveal the detailed process of detonation re-initiation through multiple reflections and to investigate the mechanisms that could contribute to the final re-initiation after several successive reflections. In order to observe the dynamic changes of the phenomenon using different complementary approaches, Schlieren photography, soot foil visualization, planar laser induced fluorescence (PLIF) and numerical simulations have been employed. According to the experimental results, it was discovered that the second last reflection is the most critical for re-initiation instead of the last reflection. This is because during the second last reflection, multiple transverse waves can be generated. They were observed to interact with one another and form the cellular-shaped structures which resemble the transverse waves in a typical detonation wave. Regarding the origin of the multiple transverse waves, they were observed to originate from a local explosion at the second last reflection. The local explosion could also convert a transverse shock into a transverse detonation, which was proven to be essential for the successful re-initiation process under the present testing conditions. Numerical simulations were implemented which can successfully re-construct the general re-initiation pattern with multiple transverse waves. It also revealed a unique transverse wave proliferation mechanism which can explain the further evolution of the transverse waves. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：这项研究的目的是揭示通过多次反射进行爆轰重新初始化的详细过程，并研究在几次连续反射之后可能有助于最终重新初始化的机制。为了使用不同的补充方法观察现象的动态变化，已采用了Schlieren摄影，烟灰箔可视化，平面激光诱导荧光（PLIF）和数值模拟。根据实验结果，发现倒数第二次反射对于重新初始化是最关键的，而不是最后一次反射。这是因为在倒数第二次反射期间，会产生多个横波。观察到它们彼此相互作用，形成了蜂窝状结构，类似于典型的爆炸波中的横波。关于多个横波的起源，观察到它们源自第二次反射时的局部爆炸。局部爆炸还可能将横向冲击转换为横向爆炸，事实证明，这对于在当前测试条件下成功进行重新初始化过程至关重要。进行了数值模拟，可以成功地用多个横波重建一般的重新初始化模式。它还揭示了独特的横波扩散机制，可以解释横波的进一步发展。 （C）2017燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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  • 来源
    《Combustion and Flame》 |2017年第6期|207-216|共10页
  • 作者

    Li Lei.; Li Jiun-Ming; Nguyen Van Bo.; Teo Chiang Juay.; Chang Po-Hsiung.; Khoo Boo Cheong.;

  • 作者单位

    Natl Univ Singapore, Dept Mech Engn, 5 Engn Dr 1,E6-6, Singapore 117608, Singapore;

    Natl Univ Singapore, Temasek Labs, 5A Engn Dr 1,02-02, Singapore 117411, Singapore;

    Natl Univ Singapore, Temasek Labs, 5A Engn Dr 1,02-02, Singapore 117411, Singapore;

    Natl Univ Singapore, Dept Mech Engn, 5 Engn Dr 1,E6-6, Singapore 117608, Singapore;

    Natl Univ Singapore, Temasek Labs, 5A Engn Dr 1,02-02, Singapore 117411, Singapore;

    Natl Univ Singapore, Dept Mech Engn, 5 Engn Dr 1,E6-6, Singapore 117608, Singapore|Natl Univ Singapore, Temasek Labs, 5A Engn Dr 1,02-02, Singapore 117411, Singapore;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Multiple reflection re-initiation; Bifurcation channel; Transverse wave; Unburnt pocket; Local explosion;

    机译：多次反射重初始化;分叉通道;横波;未烧伤的口袋;局部爆炸;

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