油气爆炸在细长密闭管道内的振荡传播特性

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振动与冲击 ›› 2017, Vol. 36 ›› Issue (17) : 97-103.

论文

油气爆炸在细长密闭管道内的振荡传播特性

王波，杜扬，齐圣，袁广强，王世茂

作者信息 +

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

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

Author information +

文章历史 +

摘要

针对细长密闭管道内汽油蒸气-空气混合气爆炸的振荡传播特性进行实验。研究表明：细长密闭管道内的油气爆炸分为振荡和非振荡两种爆炸模式；振荡爆炸超压呈现出锯齿状振荡特征，其超压增长期由4个阶段组成：第1阶段无明显的压力上升；第2阶段的高压力上升速率与快速的火焰有关；第3阶段的超压振幅以抛物线形式增长，此阶段是否有压力振荡与油气浓度、管道长径比有关，第3阶段的振荡周期随时间减小，振荡周期与火焰锋面前方的未燃区长度有关；第4阶段的超压振幅以指数形式增长，振荡周期趋于稳定并随管道长度的增加呈线性关系增加，振荡周期受到油气浓度的影响；振荡爆炸只在一定油气浓度范围内发生，且振荡爆炸的发生与油气浓度、管道长径比有关；振荡爆炸极限范围及其在油气的爆炸极限内所占比例均随管道长径比的增加而增大。

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.

导出引用

王波，杜扬，齐圣，袁广强，王世茂. 油气爆炸在细长密闭管道内的振荡传播特性[J]. 振动与冲击, 2017, 36(17): 97-103

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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