Explosion characteristics of a methane/air mixture at low initial temperatures
Explosion characteristics of a methane/air mixture at low initial temperatures
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DOI：
10.1016/j.fuel.2018.07.139
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发表时间：
2018-12-15
期刊：
影响因子：
7.4
通讯作者：
Li, Zili
中科院分区：
文献类型：
--
作者：
Cui, Gan;Wang, Shun;Li, Zili
在本文中，测量了甲烷-空气混合物在低初始温度（高达 113 K）和高压下的爆炸特性。获得了123~273 K初始温度范围内的爆炸压力、爆炸压力上升速率、燃烧持续时间和火焰发展持续时间等参数。结果表明，最大爆炸压力和最大爆炸压力上升速率在当量比为1.1时达到峰值。随着初始压力的增加，最大爆炸压力显着增加，并且由于爆炸容器内可燃混合物的密度较大，最大爆炸压力上升速率呈线性增加。随着初始温度的降低，最大爆炸压力单调增加，而初始温度对最大爆炸压力上升速率的影响可以忽略不计，因为有两个相反的方面：可燃混合物量的增加和火焰传播速度的降低。燃烧持续时间和火焰发展持续时间均随着初始压力的增加而增加，并随着初始温度的增加而减少。最后，在当量比为1.0时，获得两个经验相关性来计算燃烧持续时间和火焰发展持续时间。
In this paper, the explosion characteristics of a methane-air mixture at low initial temperatures (up to 113 K) and elevated pressures were measured. Various parameters, such as explosion pressure, rate of the explosion pressure rise, combustion duration and flame development duration were obtained for the initial temperature range of 123-273 K. The results indicated that the maximum explosion pressure and the maximum rate of explosion pressure rise reached peak values at the equivalence ratio of 1.1. With the increase in initial pressure, the maximum explosion pressure increased significantly, and the maximum rate of explosion pressure rise increased linearly because of a larger density of the flammable mixture within the explosion vessel. With the decrease in the initial temperature the maximum explosion pressure increased monotonically, whereas the effect of initial temperature on the maximum rate of explosion pressure rise was negligible because of two opposing aspects: an increase in the amount of flammable mixture and a decrease in the flame propagation speed. Both the combustion duration and the flame development duration increased with the increase in initial pressure and decreased with the increase in initial temperature. Finally, at an equivalence ratio of 1.0, two empirical correlations were obtained to calculate the combustion duration and the flame development duration.