油气爆炸过程火焰燃烧模式的实验估计

Experimental estimation of the combustion regime in the oil-gas explosion process

首先分析讨论了油气爆炸过程中火焰燃烧模式的估计方法,然后在激波管内进行了低、中、高3次不同初始油气浓度条件下的油气爆炸实验,通过实验数据分别计算出了低、中、高初始油气浓度条件下油气爆炸在初期、中期和后期的丹姆克尔数和湍流雷诺数,最后依靠丹姆克尔数-湍流雷诺数图对低、中、高初始油气浓度条件下油气爆炸初期、中期和后期的火焰燃烧模式进行了定量估计。结果表明:低、中、高初始油气浓度条件下激波管油气爆炸过程初期、中期和后期的火焰燃烧模式均为漩涡内小火焰模式。

In this artical,firstly,estimation method of flame combustion regime of the oil-gas explosion was discussed and three oil-gas explosion experiments under the conditions of low,middle and high initial gas vapor concentration were carried out,and then the Damkhler number and the turbulent Reynolds number for the early,interim and late stage of the oil-gas explosion at low,middle and high initial gas vapor concentration conditions were calculated according to the experimental data.Finally,through the Damkhler number vs.Reynolds number diagram,the combustion regimes for each stage of the oil-gas explosion at low,middle and high initial gas vapor concentration conditions were quantitative estimated.Results show that the combustions at early,interim and late stage of the gas-air explosion under the conditions of low,middle and high initial gas vapor concentration in the tube have the same regime of flameletes-in-eddies.The conclusions of this paper can provide some useful reference for the further study of combustion regime and the numerical analysis model selection of the gas-oil explosion.