Zhang Siyu, Wen Xiaoping, Zhang Sumei, Ji Wentao, Guo Zhidong, Zheng Hongxiang
School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo454003, P.R. China.
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo454003, PR China.
ACS Omega. 2022 Jul 21;7(30):26767-26776. doi: 10.1021/acsomega.2c03104. eCollection 2022 Aug 2.
Premixed hydrogen-air explosion experiments were carried out in a 1000 mm × 50 mm × 10 mm half-open narrow channel, concerning with the influences of equivalence ratio and ignition position on explosion behaviors. Experimental phenomena were different from explosion in large space. The results indicated that when ignited at the closed end of the channel, three overpressure peaks appeared, caused by the rupture of the film, Helmholtz Oscillation, and the flame-acoustic interaction, respectively. As the equivalence ratio of the hydrogen-air mixtures varied from 0.6 to 1.6, the peak overpressure first increased and then decreased. The maximum peak overpressure occurred at ϕ = 1.2. The hydrogen flame would develop into the plane tulip structure without the influence of the end wall. With the ignition position moved to the open end, overpressure wave and flame oscillated significantly. Compared with other ignition positions, the minimum value of was obtained at IP. Based on the explosion behaviors in the narrow channel, it was concluded that the closer the ignition was to the open end, the easier the oscillation was to be formed, the smaller the explosion hazard was.
在一个1000毫米×50毫米×10毫米的半开放狭窄通道内进行了预混氢气-空气爆炸实验，研究了当量比和点火位置对爆炸行为的影响。实验现象与大空间爆炸不同。结果表明，在通道封闭端点火时，分别出现了由薄膜破裂、亥姆霍兹振荡和火焰-声学相互作用引起的三个超压峰值。随着氢气-空气混合物的当量比从0.6变化到1.6，峰值超压先增大后减小。最大峰值超压出现在ϕ = 1.2时。氢气火焰会发展成平面郁金香结构，不受端壁影响。随着点火位置移至开口端，超压波和火焰显著振荡。与其他点火位置相比，在IP处获得了 的最小值。基于狭窄通道内的爆炸行为得出结论，点火位置越靠近开口端，越容易形成振荡，爆炸危险性越小。
