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《Explosion and Shock Waves》 2018-05
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Effect of obstacles on flame acceleration of propane-air explosion

ZHOU Ning;WAND Wenxiu;ZHANG Guowen;Zong Yongdi;ZHAO Huijun;YUAN Xiongjun;Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology,Changzhou University;  
The effects of blockage ratio,obstacles spacing and obstacles spatial position on the flame acceleration and explosion process of propane-air were studied in this paper.The unsteady combustion process was calculated by using the Reynolds averaged( RANS) equation and turbulent flame closure combustion model. The complex flow field around obstacles and the detailed mechanism of the interaction between the turbulent vortex and the flame surface were analyzed. The results showed that if the vortex zone is short compared to obstacles spacing,one portion of the flame would get in touch with the tube wall and some flame area would be reduced.For the higher blockage ratio,the flame area is the most important factor affecting the flame acceleration and the optimum flame acceleration can be achieved at the obstacles spacing of roughly one tube diameter. In contrast,the obstacles spacing shows little effect on the flame acceleration at lower value of blockage ratio. The flame interacted with vortex steadily during the process of flame propagation result in flame area enhancement that was counteracted by flame area extinction resulting from flame-wall interactions. However,as the blockage ratio increases to a critical value,the vorticity concentration area occupied most of the space between obstacles,therefore,the probability of contact between the flame and the tube wall became very small. In addition,the influence of the spatial position of the obstacles on the flame propagation was more significant. When the obstacles located on both sides of the pipe or in the middle of the pipe,the initial vortex intensity was too small to consume easily and there was no obvious flame folding. The most rapid flame propagation was observed when the obstacles was located on the unilateral side of the pipe,the turbulence vortex intensity in the flow field was the largest,the flame folding was also the most obvious with the process of chemical reaction.
【Fund】: 国家自然科学基金青年科学基金项目(51204026);; 国家重点研发计划重点专项项目(2017YFC0805100 2017YFC0806600);; 公安部技术研究计划项目(2016JSYJD04);; 建筑消防工程技术公安部重点实验室开放课题(KFKT2015ZD03)
【CateGory Index】: O643.221
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