爆炸压力积聚工况下石松子粉尘爆炸火焰传播特性
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摘要
搭建了一套兼具承压和可视性能粉尘爆炸实验平台,在压力积聚工况下实验研究了石松子粉尘爆炸火焰传播特性。实验结果表明:压力积聚工况下的石松子粉尘爆炸火焰呈现空间离散的束状结构,火焰锋面呈齿状。随着粉尘浓度的提升,火焰连续性增强,锋面趋于平滑,亮度增加,并在750g/m~3达到最佳。不同浓度条件下的石松子粉尘爆炸火焰在传播过程中均呈现明显的速度脉动特征,但脉动频率随粉尘浓度的增大而减小。爆炸火焰平均传播速度随粉尘浓度的增大先增大后减小,并在750g/m~3达到最高。不同浓度条件下的石松子粉尘爆炸火焰前期传播速度均高于后期传播速度。
An experimental setup which can withstand high pressure with good visibility was built.Flame propagation characteristics of lycopodium dust explosion were investigated under explosion pressure accumulation conditions.The experimental results showed that a space-dispersed fascicle-like flame structure was formed after the explosion of lycopodium dust under explosion pressure accumulation conditions.The flame front with a serrate structure was observed.However,on further increasing the dust concentration the flame continuity as well as the luminance increased and reached the top at the concentration of 750g/m~3.The velocity fluctuation during the flame propagation process of lycopodium dust explosion at different concentrations was found.But the fluctuation frequency decreased with the increase of dust concentration.The average flame propagation velocity increased and then decreased with the increase of dust concentration and reached the top at the dust concentration of 750g/m~3.The value of flame velocity was higher in the early stage,but lower in the later stage.
An experimental setup which can withstand high pressure with good visibility was built.Flame propagation characteristics of lycopodium dust explosion were investigated under explosion pressure accumulation conditions.The experimental results showed that a space-dispersed fascicle-like flame structure was formed after the explosion of lycopodium dust under explosion pressure accumulation conditions.The flame front with a serrate structure was observed.However,on further increasing the dust concentration the flame continuity as well as the luminance increased and reached the top at the concentration of 750g/m~3.The velocity fluctuation during the flame propagation process of lycopodium dust explosion at different concentrations was found.But the fluctuation frequency decreased with the increase of dust concentration.The average flame propagation velocity increased and then decreased with the increase of dust concentration and reached the top at the dust concentration of 750g/m~3.The value of flame velocity was higher in the early stage,but lower in the later stage.
引文
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[16]高伟,阿部俊太郎,荣建忠,等.气流特征对水平长管内石松子粉尘爆炸火焰结构的影响[J].爆炸与冲击,2015,35(3):372-379.DOI:10.11883/1001-1455-(2015)03-0372-08.GAO Wei,ABE S,RONG Jianzhong,et al.Effect of airflow characteristics on flame structure for following lycopodium dust-air mixtures in a long horizontal tube[J].Explosion and Shock Waves,2015,35(3):372-379.DOI:10.11883/1001-1455-(2015)03-0372-08.
[17]JI W T,YAN X Q,SUN H L,et al.Comparative analysis of the explosibility of several different hybrid mixtures[J].Powder Technology,2017,325:42-48.DOI:10.1016/j.powtec.2017.11.022.
[18]喻健良,纪文涛,孙会利,等.甲烷/石松子粉尘混合体系爆炸下限的变化规律[J].爆炸与冲击,2017,37(6):924-930.DOI:10.11883/1001-1455(2017)06-0924-07.YU Jianliang,JI Wentao,SUN Huili,et al.Experimental investigation of the lower explosion limit of hybrid mixtures of methane and lycopodium dust[J].Explosion and Shock Waves,2017,37(6):924-930.DOI:10.11883/1001-1455(2017)06-0924-07.
[2]CHEN J L,DOBASHI R,HIRANO T.Mechanisms of flame propagation through combustible particle clouds[J].Journal of Loss Prevention in the Process Industries,1996,9(3):225-229.DOI:10.1016/0950-4230(96)00001-0.
[3]JU W J,DOBASHI R,HIRANO T.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.DOI:info:doi/10.1016/S0950-4230(98)00027-8.
[4]HAN O S,YASHIMA M,MATSUDA T,et al.Behavior of flames propagating through lycopodium dust clouds in a vertical duct[J].Journal of Loss Prevention in the Process industries,2000,13:449-457.
[5]HAN O S,YASHIMA M,MATSUDA T,et al.A study of flame propagation mechanisms in lycopodium dust clouds based on dust particles’behavior[J].Journal of Loss Prevention in the Process Industries,2001,14(3):153-160.DOI:10.1016/S0950-4230(00)00049-8.
[6]PROUST C.Flame propagation and combustion in some dust-air mixtures[J].Journal of Loss Prevention in the Process Industries,2006,19(1):89-100.DOI:10.1016/j.jlp.2005.06.026.
[7]SUN J H,DOBASHI R,HIRANO T.Concentration profile of particles across a flame propagating through iron particle cloud[J].Combustion and Flame,2003,134(4):381-387.
[8]CAO W G,GAO W,PENG Y H,et al.Experimental study on the combustion sensitivity parameters and pre-combusted changes in functional groups of lignite coal dust[J].Powder Technology,2015,283:512-518.DOI:10.1016/j.powtec.2015.06.025.
[9]GAO W,TOSHIO M,YU J L,et al.Flame propagation mechanisms in dust explosions[J].Jouranal of Loss Prevention in the Process Industries,2015,36:186-194.DOI:10.1016/j.jlp.2014.12.021.
[10]GAO W,TOSHIO M,RONG J H,et al.Motion behaviors of the unburned particles ahead of flame front in hexadecanol dust explosion[J].Powder Technology,2015,271:125-133.DOI:10.1016/j.powtec.2014.11.003.
[11]AMYOTTE P R,PEGG M J.Lycopodium dust explosions in a Hartmann bomb:effects of turbulence[J].Journal of Loss Prevention in the Process Industries,1989,2(2):87-94.DOI:10.1016/0950-4230(89)80004-X.
[12]HAN O S,YASHIMA M,MATSUDA T,et al.Behavior of flames propagating through lycopodium dust clouds in a vertical duct[J].Journal of Loss Prevention in the Process Industries,2000,13(6):449-457.DOI:10.1016/S0950-4230(99)00072-8.
[13]HAN O S,YASHIMA M,MATSUDA T,et al.A study of flame propagation mechanisms in lycopodium dust clouds based on dust particles'behavior[J].Journal of Loss Prevention in the Process Industries,2001,14(3):153-160.DOI:10.1016/S0950-4230(00)00049-8.
[14]KHALIL Y F.Experimental determination of dust cloud deflagration parameters of selected hydrogen storage materials:complex metal hydrides,chemical hydrides,and adsorbents[J].Journal of Loss Prevention in the Process Industries,2013,26(1):96-103.DOI:10.1016/j.jlp.2012.09.010.
[15]SILVESTRINI M,GENOVA B,TRUJILLO F J L.Correlations for flame speed and explosion overpressure of dust clouds inside industrial enclosures[J].Journal of Loss Prevention in the Process Industries,2008,21(4):374-392.DOI:10.1016/j.jlp.2008.01.004.
[16]高伟,阿部俊太郎,荣建忠,等.气流特征对水平长管内石松子粉尘爆炸火焰结构的影响[J].爆炸与冲击,2015,35(3):372-379.DOI:10.11883/1001-1455-(2015)03-0372-08.GAO Wei,ABE S,RONG Jianzhong,et al.Effect of airflow characteristics on flame structure for following lycopodium dust-air mixtures in a long horizontal tube[J].Explosion and Shock Waves,2015,35(3):372-379.DOI:10.11883/1001-1455-(2015)03-0372-08.
[17]JI W T,YAN X Q,SUN H L,et al.Comparative analysis of the explosibility of several different hybrid mixtures[J].Powder Technology,2017,325:42-48.DOI:10.1016/j.powtec.2017.11.022.
[18]喻健良,纪文涛,孙会利,等.甲烷/石松子粉尘混合体系爆炸下限的变化规律[J].爆炸与冲击,2017,37(6):924-930.DOI:10.11883/1001-1455(2017)06-0924-07.YU Jianliang,JI Wentao,SUN Huili,et al.Experimental investigation of the lower explosion limit of hybrid mixtures of methane and lycopodium dust[J].Explosion and Shock Waves,2017,37(6):924-930.DOI:10.11883/1001-1455(2017)06-0924-07.