掺氢比对氢气-甲烷-空气燃爆特性的影响  

Effect of Hydrogen Ratio on Explosion Characteristics of Hydrogen-methane-air Mixtures

作　　者：王昊哲 郭进 吴佳晗 张瀚文 张苏 WANG Haozhe;GUO Jin;WU Jiahan;ZHANG Hanwen;ZHANG Su(College of Environment and Safety Engineering,Fuzhou University,Fuzhouu 350116,China)

机构地区：[1]福州大学环境与安全工程学院,福州350116

出　　处：《工程热物理学报》2025年第2期669-678,共10页Journal of Engineering Thermophysics

基　　金：福建省自然科学基金(No.2020J01505)。

摘　　要：在自主设计的长度和内径均为25 cm的圆柱形容器中,开展了不同掺氢比(χ)的氢气–甲烷–空气泄爆实验。实验结果表明:χ对容器内部超压有显著影响,容器内共出现三类压力峰值(p_(1)、p_(2)、p_(3))。p_(1)是泄放速率超过了燃烧产物生成率导致的,并出现在χ<0.9的实验中,其幅值几乎不受χ的影响;p_(2)由声学振荡产生并且出现在0.45?χ?0.9的实验中;p_(3)是火焰燃烧面积达到最大值产生,仅出现在χ=1的情况下。声学振荡造成的超压峰值随着χ单调增加,在发生声学振荡时,火焰表面会出现周期性的细小胞格,并且声学振荡的频率与细小胞格出现的频率相近。χ<0.3时,容器内只存在一个压力峰值p_(1);χ>0.3时,容器内最大超压随着χ单调增加。χ>0.15时,外部爆炸的最大超压也随着χ的增加而增加。Experiments were conducted in a vented cylindrical vessel to investigate the effect of hydrogen ratio(χ)on the vented deflagration of hydrogen/methane/air mixtures,with ignition source located in the center of the chamber.The combustible gas mixtures with different hydrogen ratios were prepared according to Dalton’s law of partial pressures.The pressure-time histories in the vessel were obtained by means of pressure transducers,while high-speed camera and schlieren optics were used to record the flame propagation at a frequency of 5000 Hz.Results indicate thatχsignificantly affects the pressure-time histories.In some cases,three pressure peaks of p_(1),p_(2),and p_(3)can be observed in the pressure curves in the vessel,with p_(1)caused by the higher volumetric outflow rate than that of the production by combustion,p_(2)produced by acoustically enhanced combustion,and p_(3)resulting from the maximum combustion area.p_(1)remained almost constant,and its amplitude is slightly greater than the static burst pressure of the aluminum foil.p_(2)occurred atχranging from0.45 to 0.9,increased with an increase inχ.p_(3)only appeared in the case ofχ=1.Whenχwas between 0.45 and 0.9,p_(2)was the dominant pressure peak.Moreover,the size and period of fine cells,formed on the flame surface,are significantly affected byχ,and their period is close to that of the acoustic oscillations.Whenχ<0.3,there is only one pressure peak p_(1)inside the vessel;Forχ>0.3,the maximum internal overpressure increased asχwas increased.When the flame rushed outside the vent,it ignited the combustible cloud and resulted in an external explosion.Forχ<0.15,the external explosion could not be monitored because the external explosion was very weak;the external explosion(p_(ext))occurred asχ>0.15 and its intensity increased withχ.

关 键 词：掺氢比 爆炸超压 火焰传播 声学振荡 外部爆炸 

分 类 号：TK123[动力工程及工程热物理—工程热物理]