端部开口受限空间汽油蒸气爆燃超压特性研究

基于实验研究了端部开口半受限空间内汽油蒸气泄放爆燃特性，获得了受限空间 内外爆燃超压的变化规律。研究结果表明:受限空间内部超压随时间变化分为点火孕育 期、加速泄流期、外部爆燃期、波动振荡期、衰弱恢复期，爆燃过程中出现多超压峰值 现象且伴随有强烈的压力振荡；随着初始油气浓度的增大，受限空间外部爆燃超压先增 大后减小，外部爆燃超压最大浓度为1.70%；随着比例距离的增加，受限空间外部超压 值呈负指数规律衰减，且横向衰减速率要大于轴向衰减速率。

Study on characteristics of deflagration overpressure for gasoline vapor in confined space with end opening

The characteristics of release and deflagration for gasoline vapor in semi-confined space with end opening were studied through experiment, and the change laws of deflagration overpressure inside and outside the confined space were obtained. The results showed that the change of internal overpressure against time can be divided into the ignition inoculation period, the accelerating release period, the external deflagration period, the wave oscillation period and the weak recovery period. The phenomenon of multi-peak overpressure occurred in the deflagration process, accompanied by strong pressure oscillation. With the increase of initial gasoline-air mixture concentration, the deflagration overpressure outside the confined space increased first and then decreased, with the maximum value at the concentration of 1.70%. With the increase of proportional distance, the deflagration overpressure outside the confined space presented the attenuation with a negative exponential law, and the transverse attenuation rate was larger than the axial attenuation rate.