点火位置对独头巷道瓦斯爆炸火焰参数影响实验!
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摘要
在实验室模拟独头巷道的小型方形管道内,采用微细热电偶、离子电流传感器和火焰光信号传感器,测试了闭口终端处和距离闭口终端200mm、400mm、600mm、800mm位置处五种点火情况下甲烷-空气预混火焰锋面传播过程中温度、离子电流强度及速度的变化情况。实验结果表明:闭口终端点火时,火焰锋面向开口端传播过程中各截面的温度先减小后增大;距离闭口终端200mm、400mm、600mm、800mm处点火时,火焰传播过程中点火处的温度均最高,火焰向闭口端传播过程中温度有逐渐降低的趋势。不同位置点火时,火焰向开口端传播速度是闭口端传播速度的20倍左右;闭口终端处、距离闭口终端200mm处点火火焰向开口方向传播过程中,火焰传播速度均呈现先增大后减小再增大的趋势;火焰向闭口方向传播过程中,火焰传播速度较小,但有逐渐增大的趋势;离子电流峰值的变化趋势与火焰传播的速度基本吻合,说明火焰向开口端传播比向闭口端传播更剧烈。
In the laboratory simulation of a small square pipe with a single head,a micro thermocouple,an ion current sensor and a flame optical signal sensor were used to test the change of temperature,ion current intensity and velocity during the five ignition conditions at the closed terminal and the distance closing terminal,200 mm,400 mm,600 mm,and 800 mm. The experimental results show that: during the closed end ignition, the temperature of each section decreases first and then increases when the flame front faces the open end. At the ignition of 200 mm,400 mm,600 mm and 800 mm at the closed terminal,the temperature of the point fire is the highest during the flame propagation process,and the temperature gradually decreases during the propagation of the flame to the closed end. The propagation speed of the flame to the open end is about 20 times that of the closing end,and the flame propagation speed in the closed terminal and the closing terminal 200 mm is increased first and then then then increases. In the process of flame propagation to the closed direction,the velocity of flame propagation is small,but there is a trend of gradual increase. The variation trend of the peak value of ionic current is basically consistent with the speed of flame propagation,indicating that the propagation of flame to the open end is more intense than that at the closed end.
In the laboratory simulation of a small square pipe with a single head,a micro thermocouple,an ion current sensor and a flame optical signal sensor were used to test the change of temperature,ion current intensity and velocity during the five ignition conditions at the closed terminal and the distance closing terminal,200 mm,400 mm,600 mm,and 800 mm. The experimental results show that: during the closed end ignition, the temperature of each section decreases first and then increases when the flame front faces the open end. At the ignition of 200 mm,400 mm,600 mm and 800 mm at the closed terminal,the temperature of the point fire is the highest during the flame propagation process,and the temperature gradually decreases during the propagation of the flame to the closed end. The propagation speed of the flame to the open end is about 20 times that of the closing end,and the flame propagation speed in the closed terminal and the closing terminal 200 mm is increased first and then then then increases. In the process of flame propagation to the closed direction,the velocity of flame propagation is small,but there is a trend of gradual increase. The variation trend of the peak value of ionic current is basically consistent with the speed of flame propagation,indicating that the propagation of flame to the open end is more intense than that at the closed end.
引文
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[12]王涛,文虎,罗振敏,等.敞口端点火条件下甲烷-空气爆炸火焰传播实验[J].西安科技大学学报,2017,37(5):617-622.
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[14]Furukawa J,Harada E,Hirano T.Local reaction zone thickness of a high intensity turbulent premixedflame[J].Transactions of the Japan Society of Mechanical Engineers,1993,59(1-4):267-280.
[15]Ju W J.Reaction zone structures and propagation mechanisms of flames in stearic acid particle clouds[J].Journal of Loss Prevention in the Process Industries,1998,11(6):423-430.
[16]Sun J,Dobashi R,Hirano T.Concentration profile of particles across a flame propagating through an iron particle cloud[J].Combustion&Flame,2003,134(4):381-387.
[2]俞启香.矿井瓦斯防治[M].徐州:中国矿业大学出版社.1992:145.
[3]Ferrara G,Benedetto A D,Salzano E,et al.CFD analysis of gas explosions vented through relief pipes[J].Journal of Hazardous Materials,2006,137(2):654-665.
[4]徐景德,周心权,吴兵.瓦斯浓度和火源对瓦斯爆炸传播影响的实验分析[J].煤炭科学技术,2001(11):15-17,12.
[5]郑立刚,吕先舒,郑凯,等.点火源位置对甲烷-空气爆燃超压特征的影响[J].化工学报,2015,66(7):2749-2756.
[6]冯长根,陈林顺,钱新明.点火位置对独头巷道中瓦斯爆炸超压的影响[J].安全与环境学报,2001(5):56-59.
[7]解北京,付玉凯,徐小轩.障碍物对瓦斯爆炸火焰锋面参数的影响[J].重庆大学学报,2013,36(7):108-113.
[8]罗振敏,邓军,文虎,等.小型管道中瓦斯爆炸火焰传播特性的实验研究[J].中国安全科学学报,2007(5):106-109.
[9]罗振敏,王涛,程方明,等.小尺寸管道内二氧化碳抑制甲烷爆炸效果的实验及数值模拟[J].爆炸与冲击,2015,35(3):393-400.
[10]X He,S Chen.Flame behaviors of propane/air premixed flame propagation in a closed rectangular duct with a 90-deg bend[J].the international society for optics and photonics,2008,71(26):1-7.
[11]陈先锋,张银,许小江,等.不同当量比条件下矿井瓦斯爆炸过程的数值模拟[J].采矿与安全工程学报,2012,29(3):429-433.
[12]王涛,文虎,罗振敏,等.敞口端点火条件下甲烷-空气爆炸火焰传播实验[J].西安科技大学学报,2017,37(5):617-622.
[13]赵雪林.密闭管道内低浓度甲烷着火及火焰传播特性实验研究[D].重庆:重庆大学,2014.
[14]Furukawa J,Harada E,Hirano T.Local reaction zone thickness of a high intensity turbulent premixedflame[J].Transactions of the Japan Society of Mechanical Engineers,1993,59(1-4):267-280.
[15]Ju W J.Reaction zone structures and propagation mechanisms of flames in stearic acid particle clouds[J].Journal of Loss Prevention in the Process Industries,1998,11(6):423-430.
[16]Sun J,Dobashi R,Hirano T.Concentration profile of particles across a flame propagating through an iron particle cloud[J].Combustion&Flame,2003,134(4):381-387.