TY - JOUR
TI - Effects of equivalence ratio on the deflagration characteristics premixed acetylene/air under a weak constraint
AU - Zhang Bei-Bei
AU - Cheng Yang-Fan
AU - Li Xiang
AU - Wei Xiao
AU - Qian Jia-Qi
JN - Thermal Science
PY - 2025
VL - 29
IS - 4
SP - 3253
EP - 3266
PT - Article
AB - As an important energy resource, acetylene (C2H2) has a huge explosion risk during its production, storage and utilization processes, for the leaked C2H2 would easily blend with ambient air to form explosive mixtures, causing serious explosion accidents in the presence of ignition sources. A self-designed gas explosion facility were used to investigate the flame propagation behaviors and explosion characteristics of C2H2/air with different equivalence ratios, φ, under a weak constraint. Experimental results showed that with the increasing equivalence ratio, the amount of carbon black increased, resulting in the flame colors changed from light blue to khaki, and the decay rate of the maximum explosion pressure decreased gradually. The average flame propagation velocity and flame temperature reached the maximum value of 14.16 m/s at φ = 1.32 and 3617 K at φ = 1.96, respectively. With the static placing time enlarged, the explosion pressure change trend could be divided into three-stages of "falling-standing-rising". The results would help to provide the damage data of thermal and shock wave for C2H2 explosion prevention, and develop preventive measures to improve the safety of C2H2 application process industry.