不同位置分支管道对油气爆炸强度的影响

Effect on explosion intensity of gasoline-air mixture in a pipe containing different positions of branch

为研究不同位置分支管道对油气爆炸强度的影响,搭建了不同分支管道实验系统。分别在直管道和具有不同位置分支管道的直管道中进行了油气浓度为1.75%的爆炸实验,并分析了爆炸超压值、升压速率、火焰传播速度以及火焰强度等特性参数变化情况。实验结果表明:分支管道对直管内的爆炸超压、升压速率、火焰传播速度、火焰强度和火焰持续时间有强化作用,并且距离点火端越远,强化作用越显著,火焰传播速度对火焰持续时间也有重要影响;分支管道前的爆炸超压变化曲线可以分为加速上升、膨胀泄压、振荡强化和振荡衰减等4个阶段,分支管道后的爆炸超压变化曲线可以分为加速上升、振荡强化和振荡衰减等3个阶段。

In order to study the effect of different positions of branch pipes on gasoline-air mixture explosion, an experiment system of gasoline-air mixture explosion was set up. Gasoline-air mixture explosion experiments with 1.75% oil gas concentration were conducted in a straight pipe and with different positions of branch. The changes of overpressure, rate of pressure rise, flame propagation velocity and flame intensity were analyzed. Experiment results indicate that overpressure, rate of pressure rise, flame propagation velocity, flame intensity, and flame duration are strengthened with the existence of the branch pipe, and when the branch pipe is farther from the ignition point, the effect is greater; the effect of flame propagation velocity on flame duration is also big; the changing curve of overpressure before the branch pipe can be divided into 4 phases: accelerated increasing, inflation pressure relief, oscillation strengthened, and dying out of oscillation; the changing curve of overpressure after branch pipe can be divided into 3 phases: accelerated increasing, oscillation strengthened and dying out of oscillation. © 2017, Editorial Office of Journal of Vibration and Shock. All right reserved.