封闭管道油气爆炸超压及火焰传播特性

对油气在封闭管道内的爆炸特性进行研究,发现爆炸超压发展过程可以分为3个阶段:第1次超压上升阶段、第2次超压上升阶段和超压下降阶段。初始油气浓度对爆炸初始阶段的发展有很大影响,油气浓度为1.73%时发展最激烈;当初始油气浓度较高时,在最大超压峰值附近,会产生压力振荡现象;初始油气浓度对Tulip火焰的形成及发展有较大影响,各种浓度油气的爆炸,都有形成Tulip火焰的趋势;当油气浓度适中时,Tulip火焰会一直传播到管道末端,当油气浓度较高或较低时,火焰锋面会经由鲨鱼嘴形状火焰转变为刀尖形火焰,当初始油气浓度为1.73%时,最容易发展形成Tuilp火焰。

Overpressure and flame propagation characteristics of gasoline air mixture explosion in closed tube

The explosion characteristics of gasoline air mixture in the closed tube were studied. The results showed that the development process of explosion overpressure could be divided into three stages, namely the first overpressure rise stage, the second overpressure rise stage, and the overpressure drop stage. The initial concentration of gasoline air mixture had a great impact on the development of the initial stage of explosion, and the development was the most intense at the concentration of 1.73%. When the initial concentration was high, the pressure oscillation occurred near the maximum overpressure peak. The initial concentration of gasoline air mixture had a great influence on the formation and development of Tulip flame, and under various concentrations, there were the tendency to form the Tulip flame. When the concentration was moderate, the Tulip flame would propagate to the end of tube. Whatever the concentration was higher or lower, the flame front would change to a knife point flame through the shark mouth shape flame, and the Tulip flame was most likely to form when the initial concentration was 1.73%.