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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[1] 蒋新生, 杜扬, 袁占国, 等.局部扰动对主坑道爆炸波发展的数值模拟与实验研究[J].安全与环境学报, 2005, 5(5): 19-23. http://www.cqvip.com/Main/Detail.aspx?id=20305783Jiang Xin-sheng, Du Yang, Yuan Zhan-guo, et al. Experimental and numerical simulated study of explosive waves expansion by local disturbance in main tunnel[J]. Journal of Safety and Environment, 2005, 5(5): 19-23. http://www.cqvip.com/Main/Detail.aspx?id=20305783 [2] Park D J, Lee Y S, Green A R. Experiments on the effects of multiple obstacles in vented explosion chambers[J]. Journal of Hazardous Materials, 2008, 153(1/2): 340-350. http://www.ncbi.nlm.nih.gov/pubmed/17904284 [3] Blanchard R, Arndt D, Grätz R, et al. Explosions in closed pipes containing baffles and 90 degree bends[J]. Journal of Loss Prevention in the Process Industries, 2010, 23(2): 253-259. doi: 10.1016/j.jlp.2009.09.004 [4] Zhang Pei-li, Du Yang, Zhou Yi, et al. Explosions of gasoline-air mixture in the tunnels containing branch configuration[J]. Journal of Loss Prevention in the Process Industries, 2013, 26(6): 1279-1284. doi: 10.1016/j.jlp.2013.07.003 [5] Vasil′ev A A, Trotsyuk A V. Experimental investigation and numerical simulation of an expanding multifront detonation wave[J]. Combustion, Explosion, and Shock Waves, 2003, 39(1): 80-90. doi: 10.1023/A:1022157504636 [6] Thomas G, Oakley G, Bambrey R. An experimental study of flame acceleration and an experimental study of flame acceleration and deflagration to detonation transition in representative process piping[J]. Process Safety and Environmental Protection, 2010, 88(2): 75-90. doi: 10.1016/j.psep.2009.11.008 [7] Ciccarelli G, Dorofeev S. Flame acceleration and transition to detonation in ducts[J]. Progress in Energy and Combustion Science, 2008, 34(4): 499-550. doi: 10.1016/j.pecs.2007.11.002 [8] 王汉良, 周凯元, 夏昌敬.气体爆轰波在弯曲管道中传播特性的实验研究[J].火灾科学, 2001, 10(4): 209-212. http://d.wanfangdata.com.cn/Periodical/hzkx200104004Wang Han-liang, Zhou Kai-yuan, Xia Chang-jing. Experimental studies of the propagation of detonation waves through the bends[J]. Fire Safety Science, 2001, 10(4): 209-212. http://d.wanfangdata.com.cn/Periodical/hzkx200104004 [9] 杨志, 周凯元, 谢立军, 等. Z型管道中气体火焰传播规律的实验研究[J].火灾科学, 2006, 15(3): 111-115. http://www.cnki.com.cn/Article/CJFDTotal-HZKX200603001.htmYang Zhi, Zhou Kai-yuan, Xie Li-jun, et al. Experimental study of flame transition in the Z-type tube[J]. Fire Safety Science, 2006, 15(3): 111-115. http://www.cnki.com.cn/Article/CJFDTotal-HZKX200603001.htm [10] 林柏泉, 叶青, 翟成, 等.瓦斯爆炸在分岔管道中的传播规律及分析[J].煤炭学报, 2008, 33(2): 136-139. http://d.wanfangdata.com.cn/Periodical/mtxb200802004Lin Bai-quan, Ye Qing, Zhai Cheng, et al. The propagation rule of methane explosion in bifurcation duct[J]. Journal of China Coal Society, 2008, 33(2): 136-139. http://d.wanfangdata.com.cn/Periodical/mtxb200802004 [11] 戴林超, 赵彩虹, 刘桢, 等.管道内瓦斯爆炸传播规律的数值模拟研究[J].矿业工程研究, 2011, 26(1): 31-34. http://d.wanfangdata.com.cn/Periodical/kygcyj201101007Dai Lin-chao, Zhao Cai-hong, Liu Zhen, et al. Numerical simulation study of gas explosion propagation law in the pipe[J]. Mineral Engineering Research, 2011, 26(1): 31-34. http://d.wanfangdata.com.cn/Periodical/kygcyj201101007 [12] 尤明伟, 蒋军成, 喻源, 等.不同管长条件下连通容器预混气体泄爆实验[J].化工学报, 2011, 62(10): 2969-2973. http://www.cqvip.com/QK/90316X/201110/39296971.htmlYou Ming-wei, Jiang Jun-cheng, Yu Yuan, et al. Experimental premixed flammable gas explosion venting in linked vessels with different pipe length[J]. CIESC Journa1, 2011, 62(10): 2969-2973. http://www.cqvip.com/QK/90316X/201110/39296971.html [13] 贾智伟, 景国勋, 程磊, 等.巷道截面积突变情况下瓦斯爆炸冲击波传播规律的研究[J].中国安全科学学报, 2007, 17(12): 92-94. http://www.cqvip.com/Main/Detail.aspx?id=26440547Jia Zhi-wei, Jing Guo-xun, Cheng Lei, et al. Study on propagation rules about gas explosion shock wave in the laneway with abrupt change of sectional area[J]. China Safety science Journal, 2007, 17(12): 92-94. http://www.cqvip.com/Main/Detail.aspx?id=26440547 [14] 秦涧.变直径管及弯管对瓦斯爆炸的影响研究[D].太原: 中北大学, 2009: 32-39. -
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