期刊
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
卷 67, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jlp.2020.104228
关键词
Hydrogen explosion behaviors; Suppression limit; Buoyancy instability; Suppression mechanism
资金
- National Natural Science Foundation of China [51674059, 51922025, 51874067]
- Science and Technology Major Project of Liaoning Province [2019JH1/10300002]
- Fundamental Research Funds for the Central Universities [DUT20GJ201]
By varying inert gas content, equivalence ratio and initial pressure, this study is aimed at investigating flame propagation behaviors and explosion pressure characteristics near suppression limit. For carbon dioxide, the weakest flame floating phenomenon is observed at Phi = 1.5 and the buoyant instability is enhanced when the equivalent ratio deviates to the rich and lean sides. For nitrogen, the buoyant instability decreases with increasing equivalent ratio. Both maximum explosion pressure and maximum pressure rise rate increase firstly and then decrease with the increase of equivalence ratio, and they decrease significantly with increasing content of carbon dioxide and nitrogen. For carbon dioxide, the critical suppression ratio of Phi = 0.6, 0.8, 1.0, 1.5 and 2.0 is 7.50, 7.18, 5.74, 3.83, and 2.87. For nitrogen, the critical suppression ratio of Phi = 0.6, 0.8, 1.0, 1.5 and 2.0 is 15.83, 11.87, 9.50, 6.33 and 4.75. Compared to nitrogen, the carbon dioxide is more effective on suppressing hydrogen explosion pressure. The adiabatic flame temperature, thermal diffusivity and mole fraction of active radicals continue to decrease with increasing content of carbon dioxide and nitrogen, which contributes to the decrease of laminar burning velocity.
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