Effect of concentration gradient on explosion characteristic parameters of methane-air mixture

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (11) : 26-32.

LI Zhe, CHEN Xianfeng, SUN Weikang

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Abstract

In order to study the influence of concentration gradient on combustion and explosion characteristics of methane-air premixed gas, pressure and temperature sensors were arranged in a square explosion experimental pipeline to perform explosion experiments of methane-air premixed gas under different methane concentration gradients.The results showed that with increase in concentration gradient, the average flame velocity and the maximum explosion pressure of methane-air premixed gas in the pipeline increase firstly and then decrease, and both reach the maximum when the concentration gradient is 1.0%; the rising rate of explosion pressure increases firstly and then decreases with increase in concentration gradient, and reaches the maximum when the concentration gradient is 1.5%; with increase in concentration gradient, the time to reach the maximum explosion pressure presents a reciprocating trend; with increase in concentration gradient, the explosion temperature of methane-air mixture firstly increases and then decreases.

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concentration gradient / square pipeline / explosion pressure / pressure rising rate

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LI Zhe, CHEN Xianfeng, SUN Weikang. Effect of concentration gradient on explosion characteristic parameters of methane-air mixture[J]. Journal of Vibration and Shock, 2021, 40(11): 26-32

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