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

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (24) : 204-212.

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

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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 ”.

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gasoline-air mixture / ignition position / overpressure characteristics / oscillation amplitude / oscillation period

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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

References

[1] 郝健池.巷道连接形式对瓦斯爆炸的影响 [J].煤炭技术,2015,(11):158-160.
HAO Jian-chi. Influence of Roadway Connection Form on Gas Explosion [J]. Coal Technology,2015,(11):158-160.
[2] 尉存娟,谭迎新,张建忠,朱晋生.不同间距障碍物下瓦斯爆炸特性的实验研究 [J].中北大学学报(自然科学版),2015,(2):188-190.
Yu Cunjuan, Tan Yingxin, Zhang Jianzhong, et al. Experiment Research on Blast Characters of Methane under Obstacle with Different Distance[J]. JOUNAL OF NORTH UNIVERSITY OF CHINA(NATURAL SCIENCE EDITION) ,2015,(2):188-190.
[3] LI G,DU Y,QI S,LI Y,WANG S,WANG B.Explosions of gasoline-air mixtures in a closed pipe containing a T-shaped branch structure [J].Journal of Loss Prevention in the Process Industries,2016,43529-536.
[4] YU M,ZHENG K,CHU T.Gas explosion flame propagation over various hollow-square obstacles [J].Journal of Natural Gas Science and Engineering,2016,30221-227.
[5] YANG D,LI Z P,HONG O Y.Effects of humidity, temperature and slow oxidation reactions on the occurrence of gasoline-air explosions [J].Journal of Fire Protection Engineering,2013,23(3):226-238.
[6] AJRASH M J,ZANGANEH J,MOGHTADERI B.Effects of ignition energy on fire and explosion characteristics of dilute hybrid fuel in ventilation air methane [J].Journal of Loss Prevention in the Process Industries,2016,40207-216.
[7] QI S,DU Y,WANG S,ZHOU Y,LI G.The effect of vent size and concentration in vented gasoline-air explosions [J].Journal of Loss Prevention in the Process Industries,2016,4488-94.
[8] BAUWENS C R,DOROFEEV S B.Effect of initial turbulence on vented explosion overpressures from lean hydrogen–air deflagrations [J].International Journal of Hydrogen Energy,2014,39(35):20509-20515.
[9] GUO J,SUN X,RUI S,CAO Y,HU K,WANG C.Effect of ignition position on vented hydrogen–air explosions [J].International Journal of Hydrogen Energy,2015,40(45):15780-15788.
[10] CHAO J,BAUWENS C R,DOROFEEV S B.An analysis of peak overpressures in vented gaseous explosions [J].Proceedings of the Combustion Institute,2011,33(2):2367-2374.
[11] KINDRACKI J,KOBIERA A,RARATA G,WOLANSKI P.Influence of ignition position and obstacles on explosion development in methane–air mixture in closed vessels [J].Journal of Loss Prevention in the Process Industries,2007,20(4-6):551-561.
[12] FAKANDU,MOHAMMED B.Vented gas explosions [J].University of Leeds,2014,
[13] 郑立刚,吕先舒,郑凯等.点火源位置对甲烷-空气爆炸超压特征的影响 [J].化工学报,2015,(7):2749-2756.
ZHENG Ligang, Lü Xianshu, ZHENG Kai ,et al[J]. CIESC Journal,2015,(7):2749-2756.
[14] RAYLEIGH L.The Explanation of Certain Acoustical Phenomena [J].Nature,18(455):319-321.
[15] 季俊洁,罗永浩,胡里元. 燃烧振荡的驱动机理 [J].燃气轮机技术,2006,19(3):32-36.
JI Junjie, LUO Yonghao, HU Liyuan. Driving mechanism of combustion oscillation[J]. GAS TURBINE TECHNOLOGY,2006,19(3):32-36.
[16] 冯长根,陈林顺,钱新明.点火位置对独头巷道中瓦斯爆炸超压的影响 [J].安全与环境学报,2001,1(5):56-59.
FENG Chang-gen, CHEN Lin-shun,QIAN Xin-ming. INFLUENCE OF IGNITION LOCATION ON EXPLOSION OVERPRESSURE IN COAL MINE BLIND TUNNEL[J]. Journal of Safety and Environment,2001,1(5):56-59.