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Experimental and numerical investigation on flame propagation and transition to detonation in curved channel

机译：火焰传播与弯曲通道中爆炸转变的实验和数值研究

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摘要

The Deflagration to Detonation Transition (DDT) process in a curved channel was numerically and experimentally investigated for stoichiometric ethylene/oxygen and acetylene/oxygen/argon mixtures. The numerical method was based on the two-dimensional Navier-Stokes equations with detailed chemical mechanisms. Flame propagation through the curved channel was observed using a high-speed camera. Four distinctive flame patterns were identified, appearing in the following order: spherical flame, finger flame, tongue-like flame, and detonation. The development of the tongue-like flame occupied most of time of the DDT process and played an important role in the onset of detonation. The formation of the tongue-like flame was analyzed in detail and its interactions with boundary layers enhanced the flame surface as well as the flame velocity. The modes of detonation initiation in irregular and regular cellular detonation systems were compared. Although the local explosion always occurred at the outer wall regardless of the mixture type, the detonation was caused by the amplification of instabilities for irregular system at the outer region of the tongue-like flame, whereas shock focusing-ignition occurred at the outer wall for regular system. Furthermore, the DDT run-up distance LDDT was shorter for the irregular system than for the regular system with the same detonation sensitivity. (C) 2021 Elsevier Masson SAS. All rights reserved.
机译：对弯曲通道中的爆炸转变（DDT）方法的剥蚀物质对化学计量乙烯/氧和乙炔/氩气混合物进行数值和实验研究。数值方法基于具有详细化学机制的二维Navier-Stokes方程。使用高速相机观察通过弯曲通道的火焰传播。确定了四种独特的火焰模式，以下列顺序出现：球形火焰，指火焰，舌状火焰和爆炸。舌状火焰的发展占据了DDT过程的大部分时间，并在爆炸的发作中发挥了重要作用。详细分析舌状火焰的形成，并且其与边界层的相互作用增强了火焰表面以及火焰速度。比较了不规则和常规细胞爆炸系统中的爆轰起始模式。尽管局部爆炸总是发生在外墙上，但是无论混合物类型如何，爆炸都是由舌状火焰外部区域的不规则系统的不稳定性的扩增引起的，而冲击聚焦点火发生在外墙上常规系统。此外，不规则系统的DDT加速距离LDDT比具有相同爆轰灵敏度的常规系统更短。 （c）2021 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2021年第11期|107036.1-107036.9|共9页
  • 作者

    Pan Zhenhua; Zhang Zenghai; Yang Huaiyuan; Gui Mingyue; Zhang Penggang; Zhu Yuejin;

  • 作者单位

    Jiangsu Univ Sch Energy Resources & Power Engn Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Sch Energy Resources & Power Engn Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Sch Energy Resources & Power Engn Zhenjiang 212013 Jiangsu Peoples R China;

    Nanjing Univ Sci & Technol Sci & Technol Transient Phys Lab Nanjing 210094 Jiangsu Peoples R China;

    Jiangsu Univ Sch Energy Resources & Power Engn Zhenjiang 212013 Jiangsu Peoples R China;

    Jiangsu Univ Sch Energy Resources & Power Engn Zhenjiang 212013 Jiangsu Peoples R China;

  • 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 eng
  • 中图分类
  • 关键词

    Curved channel; Flame acceleration; Tongue-like flame; Instability; Onset of detonation;

    机译：弯曲的通道;火焰加速度;舌状火焰;不稳定;爆炸发作;

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