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 ”.
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. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(24): 204-212.
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