点火位置对管道内油气泄压爆炸超压特性影响

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (24) : 204-212.

论文

李国庆1，杜扬1，王波1，周艳杰1，2，齐圣1，魏树旺1

作者信息 +

Effects of ignition position on overpressure characteristics of vented gasoline-air mixture explosion in a pipe

LI Guoqing1, DU Yang1,WANG Bo1,ZHOU Yanjie1,2,QI Sheng1 ,WEI Shuwang1

Author information +

文章历史 +

摘要

进行了初始油气浓度为1.7%全透明方管内不同点火位置（底部、中部和口部）对油气泄压爆炸超压特性的影响，实验结果表明：（1）底部点火时超压曲线不发生明显振荡，中部和口部点火时，超压曲线振荡明显；（2）爆炸超压波形变化和火焰传播形态有密切的内在联系，底部点火时，超压变化过程主要受火焰加速、火焰面积尺寸和外部爆炸的影响；中部点火时超压变化除受到火焰加速、火焰面积尺寸和外部爆炸的影响之外，还受到火焰和声波相互作用的影响；口部点火时，超压变化还受到声波振荡的影响；（3）对于中部和口部点火，压力振荡上升期的振幅呈指数增长，衰减期的振幅呈负指数下降；在超压上升阶段，振荡周期以接近二次抛物线的趋势下降，对于超压衰减阶段，超压振荡周期呈震荡上升；（4）对于管道内部测点，不考虑声波和火焰的相互作用时，最大超压峰值随着点火源与管道封闭端的距离的增大而减小；考虑声波和火焰的相互作用时，最大超压峰值随着点火距离的增大而增大。对于管道外部测点，不考虑声波和火焰的相互作用时，第一个超压峰值随着点火距离的增大而减小，如果考虑火焰声波的相互作用，最大超压峰值随着距离增大先减小再增大。

Abstract

Tests for vented gasoline-air mixture explosions were conducted in a transparent square cross-section pipe under an initial gasoline vapor concentration of 1.7% with three different ignition positions of bottom, center and front in order to investigate effects of ignition positions on overpressure characteristics of the explosion. The test results showed that (1) the overpressure curve oscillates obviously during front ignition and center ignition, while it has no oscillation during bottom ignition; (2) the overpressure curve is closely related to flame propagating state; during bottom ignition, the overpressure changes have the effects of flame acceleration, flame surface area and external explosion; the additional factors of “interaction between flame and sound wave ” and “acoustic wave oscillation” affect the overpressure changes during center ignition and front one, respectively; (3) during center and front ignitions, the overpressure oscillation amplitude increases in an exponential form within its growing duration, while it decreases in a negative exponential form within its decreasing duration; the oscillation period decreases in a parabolic curve trend within the overpressure growing duration, while it increases in an oscillation trend within the overpressure decreasing duration; (4) for the pipe’s internal measuring point, the maximum peak overpressure decreases with increase in the distance between ignition position and the pipe dead end when ignoring the effect of “interaction between flame and sound wave ”, while it increases with increase in ignition distance when considering the effect of “interaction between flame and sound wave ”; for the pipe’s external measuring point, the first peak overpressure value decreases with increase in ignition distance when ignoring the effect of “interaction between flame and sound wave ”, while the maximum peak overpressure firstly decreases and then increases with increase in ignition distance when considering the effect of “interaction between flame and sound wave ”.

导出引用

李国庆1，杜扬1，王波1，周艳杰1，2，齐圣1，魏树旺1. 点火位置对管道内油气泄压爆炸超压特性影响[J]. 振动与冲击, 2017, 36(24): 204-212

LI Guoqing1, DU Yang1,WANG Bo1,ZHOU Yanjie1,2,QI Sheng1,WEI Shuwang1. Effects of ignition position on overpressure characteristics of vented gasoline-air mixture explosion in a pipe[J]. Journal of Vibration and Shock, 2017, 36(24): 204-212

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