Effect of concentration and ignition position on characteristics of premixed hydrogen-air deflagration

被引：0
|
作者：
Zheng L. [1 ,2 ]
Zhu X. [2 ]
Yu S. [1 ,2 ]
Wang Y. [2 ]
Li G. [2 ]
Du D. [2 ]
Dou Z. [2 ]
Su Y. [2 ]
机构：
[1] The Collaborative Innovation Center of Coal Safety, Production of Henan Province, Jiaozuo, 454003, Henan
[2] State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo, 454003, Henan
来源：
Huagong Xuebao/CIESC Journal | 2019年 / 70卷 / 01期
关键词：
Concentration; Deflagration; Hydrogen; Ignition position; Pressure;
D O I：
10.11949/j.issn.0438-1157.20180726
中图分类号：
学科分类号：
摘要：
To study the effect of the multiple concentrations and ignition locations on the characteristics of the premixed hydrogen-air deflagration, an experimental study is conducted in an elongated transparent square cross-section duct closed at one end and open at the opposite end. The results show that hydrogen concentration and ignition position exerted a great impact on the evolution of flame front structures. The reaction under each equivalence ratio proceeded most rapidly when the mixture was ignited at 100 mm from the closed end. The ignition position has a greater influence on flame development in very lean or rich fuel. The hydrogen concentration and ignition position simultaneously affected the pressure waveform. The overpressure waveform under different equivalence ratios presents complex changes when the ignition occurred in the left and right parts of the duct respectively, with the 300 mm from the closed end as the boundary of ignition position. The overpressure peak has a strong dependence on hydrogen concentration, and the effect of concentration on the overpressure peak is much greater than that of ignition location. The maximum overpressure peak was obtained in Φ =1.25 at all ignition positions. the maximum overpressure corresponds to the ignition position which is depending on the equivalence ratio. © All Right Reserved.
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页码：408 / 416
页数：8
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