Experimental and numerical simulation of gasoline-air mixture explosion characteristics in semi-confined space

doi:10.11949/j.issn.0438-1157.20170526

Abstract

Abstract:

the characteristics of oil and gas explosion in volumetric semi-confined space under the condition of barrier is studied. The characteristics of flame shape and explosion overpressure during the explosion process are experimented by high-speed photography and other techniques. The flame shape, the flow field structure and the overpressure characteristic when the flame interacts with the obstacle are simulated accurately, and the results are compared with the experiment. The results show that the presence of obstruction will change the flame structure, the hemispherical→conical→brush-like transition will occur, and the flame vortex will be generated in the downstream of the obstacle due to the unburned gas. As a result of the coupling between the combustion rate and the pressure relief rate, the presence of obstructions in the oil and gas explosion can lead to changes in the combustion rate and the pressure relief rate, which in turn have an effect on the overpressure peak.

Key words: obstacle, semi-confined space, large eddy simulation, gasoline-air, turbulent flow, mixtures, experimental validation

摘要：

针对置障条件下容积式半密闭空间内油气着火爆炸特性进行了研究，通过高速摄影等技术手段对爆炸过程中火焰形态，爆炸超压特性进行了实验，并对实验进行了大涡模拟，精确模拟了火焰与障碍物相互作用时的火焰形态，流场结构，超压特性，与实验进行了对比分析。结果表明：障碍物的存在会使火焰结构发生变化，出现半球形→圆锥形→毛刷形的转变，并在障碍物下游由于未燃气体的卷吸产生火焰旋涡；爆炸超压峰值的产生是燃烧速度与泄压速度相互耦合作用的结果，在油气爆炸过程中，障碍物的存在会导致燃烧速度以及泄压速度的变化，进而对超压峰值产生一定的影响。

关键词: 障碍物, 半密闭空间, 大涡模拟, 油气, 湍流, 混合物, 实验验证

CLC Number:

X932

OU Yihong, LI Run, YUAN Guangqiang, LI Guoqing, WANG Shimao. Experimental and numerical simulation of gasoline-air mixture explosion characteristics in semi-confined space[J]. CIESC Journal, 2017, 68(11): 4437-4444.

欧益宏, 李润, 袁广强, 李国庆, 王世茂. 置障条件下半密闭空间油气爆炸特性实验与数值模拟[J]. 化工学报, 2017, 68(11): 4437-4444.

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