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Phenomenological characteristics of hydrogen/air premixed flame propagation in closed rectangular channels

机译：封闭矩形通道中氢气/空气预混火焰繁殖的现象学特征

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摘要

The propagation of hydrogen/air premixed flame in channels were investigated, giving particular focus on the effect of aspect ratio through both experimental and numerical investigations. The schlieren system and pressure sensor were used to capture flame shapes and pressure changes, respectively in a channel with aspect ratio of 12. The phenomena of flame shape evolutions, including classic tulip inversion, featured T-shape flame, elongated tulip flame and tulip distortion captured in the experiments, were well reproduced by the numerical simulation. The predicted flame front speed, pressure build-up and their fluctuations are also in reasonably good agreement with the measurements. The validated numerical modelling approach was then applied to investigate the effect of channel aspect ratio on flame shape change, flame propagation and overpressure dynamics. It was found that with increasing aspect ratio, the flame shape changes become more vigorous accompanied by the amplified flame and pressured dynamics due to the enhanced pressure waves, flame-pressure wave interaction and flame instability. The Bychkov's analytical model was used to give predictions on the characteristic times of flame deformation in the channels. By comparison, the analytical model performs better for channel with lower aspect ratio.(c) 2021 Elsevier Ltd. All rights reserved.
机译：研究了氢气/空气预混火焰在通道中的繁殖，通过实验和数值研究特别关注纵横比的效果。 Schlieren系统和压力传感器用于捕获火焰形状和压力变化，分别在宽高比为12的通道中。火焰形状的现象，包括经典的郁金香反转，具有T形火焰，细长的郁金香火焰和郁金香失真在实验中捕获，通过数值模拟再现。预测的火焰前速度，压力积聚及其波动也与测量相当好。然后应用验证的数值建模方法来研究信道纵横比对火焰形状变化，火焰传播和过压动力学的影响。发现随着纵横比的增加，由于增强的压力波，火焰压力波相互作用和火焰不稳定性，火焰形状变化变得更加剧烈地伴随着扩增的火焰和压力动力学。 BYCHKOV的分析模型用于对通道中的火焰变形的特征时间进行预测。通过比较，分析模型对具有较低宽高比的通道更好。（c）2021 Elsevier Ltd.保留所有权利。

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  • 来源
    《Renewable energy》 |2021年第8期|606-615|共10页
  • 作者

    Shen Xiaobo; Xu Jiaying; Wen Jennifer X.;

  • 作者单位

    East China Univ Sci & Technol Sch Resources & Environm Engn Shanghai 200237 Peoples R China|Shanghai Inst Pollut Control & Ecol Secur Shanghai 200092 Peoples R China;

    East China Univ Sci & Technol Sch Resources & Environm Engn Shanghai 200237 Peoples R China;

    Univ Warwick Sch Engn Warwick FIRE Coventry CV4 7AL W Midlands England;

  • 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

    Hydrogen; Premixed flame; Aspect ratio; Flame deformation; Dynamics;

    机译：氢;预混火焰;纵横比;火焰变形;动态;

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