Explosion and flame evolution characteristics of methane-acetylene premixed gas under constant volume conditions

doi:10.16265/j.cnki.issn1003-3033.2026.08.0988

Abstract

Abstract:

To investigate the evaluation basis for the explosion risk of mixed gas during the cracking of methane (CH₄) to acetylene (C₂H₂), a 20-L spherical explosion pressure test system was utilized to determine the explosion limits of the mixed gas under low-proportion blending conditions and revise the empirical formula. Simultaneously, Fluent software was employed to simulate the explosion characteristics of the mixed gas in a spherical pressure vessel, and numerical simulations were carried out on three stoichiometric mixtures with acetylene blending ratios of 5%, 50%, and 95%. The results show that the conclusions from experimental tests and numerical simulations are in good agreement. In Stages I and III, the reaction characteristics of the mixed gas are similar to those of single-component combustible gases; in Stage II, the reactions between methane and acetylene are mutually coupled and more stable. The gas density distribution in the container is consistent with the trend of temperature cloud diagrams, showing internal and external density differences bounded by the flame front. The temperature change time at the same monitoring point advances with the increase of the blending ratio, and the density at each monitoring point shows differential changes.

Key words: constant volume, CH₄-C₂H₂, explosion limit, flame evolution, blending ratio, numerical simulation

CLC Number:

X932爆炸安全与防火、防爆

Liang Yuntao, Bai Jieqi, Wang Lin, Tian Fuchao, Su Weiwei, Zhao Pengtao. Explosion and flame evolution characteristics of methane-acetylene premixed gas under constant volume conditions[J]. China Safety Science Journal, 2026, 36(8): 65-73.

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参数	数值
甲烷密度/(kg/m³)	0.717
乙炔密度/(kg/m³)	1.17
壁面比热容/[J/(kg·K)]	480
壁面热导率/[W/(m·K)]	48

R/%	反应容器内各气体体积分数/%
R/%	C₂H₂	CH₄	Air
5	0.47	8.93	90.6
50	4.27	4.27	91.46
95	7.43	0.39	92.18