Explosion intensity of gasoline-air mixture in the pipeline containing a T-shaped branch pipe
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摘要: 为了研究T型分支结构对管道内油气混合物爆炸强度的影响规律，测试了不同初始体积分数条件下直管和具有T型分支管中爆炸波超压值，并利用有机玻璃透明管道对火焰传播规律进行了可视化研究。得到以下结论：(1)T型分支管道对油气爆炸有强化作用，在油气体积分数为1.2%至1.6%范围内表现最明显; (2)T型分支管道对油气爆炸的强化作用受管道横截面突扩和障碍物扰动以及波的反射、绕射三方面的影响; (3)火焰经过分支管道时，火焰阵面发生极大的扭曲，火焰表面积显著增大，燃烧速率增大，增强了热量和活性物质的输运速率，提高了爆炸波的强度; (4)在T型分支管道附近, 油气爆炸的压力突变增强, 是由压力波反射、绕射引起的温升效应和压力波引起湍流强度增强共同导致。Abstract: To research the influence of the T-shaped branch structure during the explosions of gasoline-air mixture in pipelines, the explosion wave overpressure of gasoline-air mixture explosion in the T-shaped branch pipeline and the straight pipeline at different initial volune fractions were measured through contrast experiments, and the flame propagation rules were researched in an organic glass pipeline by visualized study. The results show that the T-shaped branch pipe can strengthen the explosions of gasoline-air mixture in pipelines, which is the most obvious within the volume fraction range of oilgas from 1.2% to 1.6%. The effect of the T-shaped branch pipe to strengthen the explosion of gasoline-air mixture comes from three aspects: the sudden enlargement of the pipeline cross section, the reinforcement of the disturbance and the obstacles, and the influence of the reflection and diffraction of the waves. When the flame propagates to the T-shaped branch pipeline, the flame front creases distorted, the flame surface area and combustion rate increase significantly, which enhances the heat and the transport rate of active material and improves the strength of the explosion waves. Near the T-shaped branch pipe, the pressure of gasoline-air mixture explosion increased suddenly, both because of the temperature effect caused by the pressure wave reflection and diffraction, and the turbulence intensity increased by explosion waves.
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Key words:
- mechanics of explosion /
- explosion intensity /
- T-shaped branch pipe /
- gasoline-air mixture /
- explosion wave /
- flame
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图 2 不同测点爆炸波超压值随油气初始体积分数的变化
Figure 2. Overpressure values of different measuring points varied with initial volume fraction of oilgas
图 3 具有T型分支管道的管道内2测点的爆炸波超压值及压力差随油气初始体积分数的变化
Figure 3. Overpressure values of two measuring points in the T-shaped branch pipe and their pressure difference varied with initial volume fraction of oilgas
图 5 有机玻璃管道可视化照片
Figure 5. Pictures by a high-speed camera in the organic glass pipeline
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