掺混臭氧对微圆管内甲烷/氢气/氧气爆轰特性的影响

Effect of Adding Ozone on Propagation Characteristics of Methane/Hydrogen/Oxygen Detonation Wave in Millimeter Tube

中文关键词: 臭氧 爆轰 起爆距离 传播速度 缓燃向爆轰转捩

英文关键词: ozone, detonation, initiation  distance, propagation  speed, DDT

中文摘要:

      为研究掺混O3对2CH4-2H2-5O2混合气火焰、由缓燃向爆震转捩(DDT)过程及爆轰波传播特性的影响,使用高速摄像机(CCD)观测了不同O3浓度(0％,0.44％,0.95％,1.4％,2％)下,2CH4-2H2-5O2混合气在不同内径的毫米级(3mm、5mm、7mm)管道内的火焰传播情况,进而分析了掺混O3对2CH4-2H2-5O2DDT过程及爆轰波传播特性的影响。实验结果表明,添加臭氧可以显著加速火焰的传播速度,从而加快爆燃向爆轰(DDT)过程,缩短起爆距离。在相同管径下,随着混合臭氧浓度的增加,火焰的传播速度增加,起爆距离减小。而当添加的臭氧比率相同时,随着管道直径的减小,起爆距离缩短。

英文摘要:

      To study the effect of ozone on the detonation propagation with mixture of methane-hydrogen-oxygen in tubes of 3 mm, 5 mm, and 7 mm. various concentrations of ozone (0%、0.44%、0.95%、1.4%、2%)were introduced in the present study. Flame propagation through tube was observed using a high–speed changed–coupled device (CCD) camera. The experimental results show that the addition of ozone can significantly accelerate the flame propagation, and hence promote the transition of deflagration to detonation (DDT) process. Under the same tube diameter, as the concentration of the mixed ozone increases, the flame propagation speed increases and the detonation distance decreases. Further, when the adding ozone ratio is the same, the detonation distance is shortened as the tube diameter is decreased.