Oscillation propagation characteristics of gasoline-air mixture explosion in elongated closed tubes

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (17) : 97-103.

WANG Bo, DU Yang, QI Sheng, YUAN Guang-qiang, WANG Shi-mao

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Abstract

Oscillation propagation characteristics of gasoline-air mixture explosion was experimentally determined in several elongated closed tubes. The results show two regimes of explosion for gasoline-air mixture: oscillation and non-oscillation. Oscillation explosion overpressures exhibit a saw-toothed oscillation characteristic, and its growth period consists of four stages: The 1st stage has no significant increase in pressure. High rate of pressure rise for the 2nd stage is associated with very fast flame speeds. Amplitude of the 3rd stage shows a parabolic growth, and whether there is a pressure oscillation at this stage is related to gasoline-air mixture concentration and aspect ratio, while oscillation period of this stage decreases with time, which is related to length of unburned zone in front of flame front. Amplitude of the 4th stage increases exponentially, and oscillation period tends to be stable and increases linearly with increasing the tube length, it is also affected by gasoline-air mixture concentration. Oscillations explosions occur only within certain mixture compositions, and the occurrence of oscillation explosion is associated with gasoline-air mixture concentration and aspect ratio. Both the range of oscillation explosion limit and its proportion within the whole explosion limits increase with increasing the aspect ratio.

Key words

elongated closed tube / gasoline-air mixture / aspect ratio / oscillation explosion / amplitude / period

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WANG Bo, DU Yang, QI Sheng, YUAN Guang-qiang, WANG Shi-mao. Oscillation propagation characteristics of gasoline-air mixture explosion in elongated closed tubes[J]. Journal of Vibration and Shock, 2017, 36(17): 97-103

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