Effect of obstacles on flame acceleration of propane-air explosion

ZHOU Ning; WAND Wenxiu; ZHANG Guowen; Zong Yongdi; ZHAO Huijun; YUAN Xiongjun

doi:10.11883/bzycj-2017-0109

Volume 38 Issue 5

Jul. 2018

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ZHOU Ning, WAND Wenxiu, ZHANG Guowen, Zong Yongdi, ZHAO Huijun, YUAN Xiongjun. Effect of obstacles on flame acceleration of propane-air explosion[J]. Explosion And Shock Waves, 2018, 38(5): 1106-1114. doi: 10.11883/bzycj-2017-0109

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Effect of obstacles on flame acceleration of propane-air explosion

doi: 10.11883/bzycj-2017-0109

Jiangsu Key Laboratory of Oil-Gas Storage and Transportation Technology, Changzhou University, Changzhou 213016, Jiangsu, China

Received Date: 2017-04-05
Rev Recd Date: 2017-06-27
Publish Date: 2018-09-25

Abstract

Abstract

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.
- flame acceleration,
- Reynolds averaged Navier-Stokes equation,
- turbulence vortex,
- obstacle

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References

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