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An experimental study on premixed syngas/air flame propagating across an obstacle in closed duct

机译：封闭管道上障碍物传播预混合成气/空气火焰的实验研究

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摘要

This paper studies the effect of obstacle on the propagation of the premixed flame. Experiments are conducted in a closed rectangular duct that house a pair of fence-type obstacles with various blockage ratios (BR = 0, 0.3, and 0.5) mounted both on top and bottom walls of the duct employing the stoichiometric syngas/air mixtures with various hydrogen volume fractions (0% = x(H-2) = 50%). High-speed camera and piezoelectric pressure gauges are respectively employed to track the propagation of the premixed flame complex and overpressure dynamics. The presence of obstacles changes the flame front shape and breaks the flame surface. The flame will still invert and the tulip flame forms after propagation through the obstacle opening. There is a new pattern of tulip flame development because of the vortex motion caused by the obstacles. After inversion, obstacles and hydrogen volume fractions are coupled to affect the propagation dynamics. The flame maintains in tulip shape as x (H-2) = 0%, but the flame oscillates and undergoes a more drastic shape change as x(H-2) = 10%. The characteristic time decreases, but the maximum flame tip speed increases, as hydrogen volume fraction increases significantly as 0% = x(H-2) 10% and gradually as x(H-2) = 10%. The presence of the obstacles has no effect on the flame touching the duct walls, but accelerates the flame inversion and propagation to the discharge vent. The maximum flame tip speed increases with blockage ratios. Finally, the corresponding of flame tip speed and overpressure profile is specially observed and discussed.
机译：本文研究了障碍对预混火焰繁殖的影响。实验在封闭的矩形管道中进行，该矩形管道在管道的顶部和底壁上安装有各种堵塞比（Br = 0,0.3和0.5）的闭合型障碍物，所述管道的顶壁与各种化学计量的合成气/空气混合物一起安装在管道的顶壁和底壁上氢体积级分（0％<= X（H-2）<= 50％）。分别采用高速相机和压电压力表，以跟踪预混火焰复合物和过压动力学的传播。障碍物的存在改变了火焰前部形状并断开火焰表面。在传播通过障碍物开口之后，火焰仍将倒置和郁金香火焰形式。由于障碍造成的涡流运动，有一种新的郁金香火焰开发模式。倒置后，障碍物和氢体积分数耦合以影响传播动态。火焰以郁金香形状保持为x（H-2）= 0％，但是火焰振荡并经历更激烈的形状变化为x（h-2）> = 10％。特征时间减小，但最大火焰尖端速度增加，因为氢体积分数显着增加0％<= x（H-2）<10％，逐渐为x（H-2）> = 10％。障碍物的存在对触摸管壁的火焰没有影响，但加速了火焰反转和传播到排出通风口。最大火焰尖端速度随堵塞比率增加。最后，特别观察并讨论了相应的火焰尖端速度和过压轮廓。

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  • 来源
    《Fuel》 |2020年第may1期|117200.1-117200.11|共11页
  • 作者

    Yang Xufeng; Yu Minggao; Zheng Kai; Luan Pengpeng; Han Shixin;

  • 作者单位

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam & Control Chongqing 400044 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam & Control Chongqing 400044 Peoples R China|Henan Polytech Univ Sch Safety Sci & Engn Jiaozuo 454003 Henan Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam & Control Chongqing 400044 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam & Control Chongqing 400044 Peoples R China;

    Chongqing Univ State Key Lab Coal Mine Disaster Dynam & Control Chongqing 400044 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

    Premixed flame propagation; Tulip flame; Flame oscillation; H-2/CO; Obstacle;

    机译：预混火焰繁殖;郁金香火焰;火焰振荡;H-2 / CO;障碍物;

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