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为探索空气与甲烷气体混合物在流动状态下的爆炸特性,采用FRTA爆炸极限测试仪,对比研究甲烷在宏观静止状态和不同湍流强度下的爆炸极限。通过测试容器内置搅拌转子转速表征混合气体的湍流强度,并利用兰金组合涡模型分析混合气体爆炸极限与其湍流强度的关系。结果表明:宏观静止状态下甲烷爆炸范围为5.077%~15.433%;当搅拌子转速从0增大到1 200 rad/s时,甲烷爆炸下限上升为5.484%,爆炸上限降低为15.086%。
In order to explore the explosive behavior of the mixture of air and methane in flowing state, the explosion limit of methane under macroscopical static state and different turbulence intensity was compared using the FRTA explosion limit tester. The turbulence intensity of the mixed gas is characterized by the rotation speed of the stirring vessel in the test vessel. The relationship between the explosive limit of the mixed gas and the turbulence intensity is analyzed by Rankine combinatorial eddy model. The results show that the range of methane explosion is 5.077% ~ 15.433% in macroscopically static state. When the speed of stirrer increases from 0 to 1 200 rad / s, the lower limit of methane explosion increases to 5.484% and the upper explosion limit decreases to 15.086%.