An experimental study on gasoline-air mixture explosions in pipes under closed and vented conditions

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (16) : 261-266.

JIANG Xinsheng1, XIE Wei1, WEI Shuwang2, XU Jiannan1, ZHOU Yi1

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Abstract

To study the difference in the development rules of gasoline-air mixture detonation waves in enclosed pipes and vented pipes and the effects of the two kinds of conditions on the overpressure and flame propagation of detonation in pipes, a 23.3-meter slender pipeline experimental system was set up, and the gasoline-air mixture explosion experiment was carried out.The result shows that whether the pipe is enclosed or vented, the pipe will undergo a process of deflagration to detonation if it is long enough.And when the pipe is in a state of detonation, the maximum overpressure generated will exceed 3 MPa above.When the flame’s length as it spreads to the venting point is too long, the detonation will occur ahead of the time in the enclosed pipe.Therefore, setting a reasonable venting point for safety protection projects is of great significance.Pressure relief measures on the protection of the system after detonation is posterior, but it can achieve the ultimate purpose of reducing pressure only if the system’s pressure design is greater than the maximum overpressure of the explosion in the pipe.Under the condition of pressure relief, the flame of the gasoline-air mixture explosion spraying out from the pipe nozzle is about 3 meters long and 1.5 meters wide, and it is ellipsoid-shaped, which is of reference value to safety distance of the pressure relief in practical engineering to avoid secondary destruction.

Key words

enclosed pipe / vented pipe / gasoline-air mixture explosion / simulation experiment / narrow pipe

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JIANG Xinsheng1, XIE Wei1, WEI Shuwang2, XU Jiannan1, ZHOU Yi1. An experimental study on gasoline-air mixture explosions in pipes under closed and vented conditions[J]. Journal of Vibration and Shock, 2018, 37(16): 261-266

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