Study on influence of methane's volume fraction and roadway structure on methane explosion characteristics

doi:10.16265/j.cnki.issn 1003-3033.2021.S1.024

Abstract

Abstract: In order to clarify influence of methane's volume fraction and roadway structure on methane-air explosion characteristics, three kinds of tunnel models with different structures were established by using Fluent software. Then, numerical calculations of explosion process in roadway were carried out for methane at volume fraction of 6%, 9.5%, and 13%, and change laws of explosion pressure and temperature and propagation characteristics of flame were analyzed. The results show that when the volume fraction is 9.5%, peak pressure of shock wave and explosion temperature are the highest in straight roadway. With the increase of test distance, the peak pressure decreases continuously in conformity to exponential attenuation law. The difference in pressure peaks after methane explosion for different roadway structures mainly appears at the bend, ranking as 90°roadway > straight roadway > bifurcation roadway. Peak pressure is significantly reduced after passing through bend in bifurcated roadway, which has a significant hindering effect on shock wave. In addition, when it enters the bend and propagates along walls, it will be affected by compression wave, sparse wave and reflected wave, and flame propagation characteristics along walls will change.

Key words: methane concentration, structure of roadway, explosion characteristics, methane-air premixed gas, explosion pressure

CLC Number:

X932

MENG Xianhua, XIE Yansen. Study on influence of methane's volume fraction and roadway structure on methane explosion characteristics[J]. China Safety Science Journal, 2021, 31(S1): 136-142.

References

[1] GHARAGHEIZI F. Quantitative structure property relationship for prediction of the lower flammability limit of pure compounds[J]. Energy & Fuels, 2008, 22(5):3 037-3 039.
[2] VANDERSTRAETEN B, TUERLINCKX D, BERGHMANS J, et al. Experimental study of the pressure and temperature dependence on the upper flammability limit of methane/air mixtures[J]. Journal of Hazardous Materials, 1997, 56(3): 237-246.
[3] 刘明翰, 王志荣, 甄亚亚, 等. 球接管容器气体爆炸尺寸效应的试验研究与数值分析[J]. 安全与环境学报, 2017, 17(4): 1 334-1 338.
LIU Minghan, WANG Zhirong, ZHEN Yaya, et al. Experimental study and a numerical analysis of the effects of vessel size on the gas explosion in a spherical one connected to the pipes[J]. Journal of Safety and Environment, 2017, 17(4): 1 334-1 338.
[4] TRAN M V, SCRIBANO G, CHENG T C, et al. Simulation of explosion characteristics of syngas/air mixtures[J]. Energy Procedia, 2018, 153:131-136.
[5] 胡铁柱. 瓦斯爆炸传播规律数值模拟研究[D]. 北京:中国矿业大学(北京), 2008.
HU Tiezhu. Simulation study on the propagation of gas explosion[D]. Beijing:China University of Mining & Technology (Beijing), 2008.
[6] 田诗雅, 刘剑, 高科. 密闭管道瓦斯爆炸冲击波冲量及压力上升速率的实验研究[J]. 中国安全生产科学技术, 2015,11(8):16-21.
TIAN Shiya, LIU Jian, GAO Ke. Experimental study on shock wave impulse and pressure rise rate of gas explosion in airtight pipeline[J]. Journal of Safety Science and Technology, 2015,11(8):16-21.
[7] 贾泉升, 司荣军, 李润之,等. 定容条件下瓦斯爆炸超压及爆后气体成分试验研究[J]. 煤矿安全, 2019, 50(12): 1-5.
JIA Quansheng, SI Rongjun, LI Runzhi, et al. Experimental study on overpressure and gas composition after gases explosion under constant volume condition, 2019, 50(12): 1-5.
[8] 解北京, 杜玉晶, 王亮. 分岔管道内瓦斯爆炸火焰传播规律实验及数值模拟[J]. 重庆大学学报, 2019, 42(6):69-77.
XIE Beijing, DU Yujing, WANG Liang. Experimental and numerical simulation of gas propagation law of gas explosion flame in bifurcation pipeline[J]. Journal of Chongqing University, 2019, 42(6): 69-77.
[9] 赵丹, 齐昊, 潘竞涛,等. 不同类型管道内瓦斯爆炸冲击波传播试验研究[J]. 中国安全科学学报, 2018, 28(3):79-83.
ZHAO Dan, QI Hao, PAN Jingtao, et al. Experimental study on gas explosion shock wave propagation in different types of pipelines[J]. China Safety Science Journal, 2018, 28(3): 79-83.
[10] 黄强, 穆朝民, 王亚军, 等. 瓦斯体积分数对90°弯管泄爆特性的影响[J]. 中国安全科学学报, 2020, 30(11): 101-107.
HUANG Qiang, MU Chaomin, WANG Yajun, et al. Effects of gas volume fraction on venting features of 90° elbows after explosion[J]. China Safety Science Journal, 2020, 30(11): 101-107.
[11] 马恒, 陈晓军, 荆德吉. H型通风巷道瓦斯爆炸及泄爆过程模拟研究[J]. 中国安全科学学报, 2021, 31(1):45-51.
MA Heng, CHEN Xiaojun, JING Deji. Simulation study on gas explosion and discharge process in H-type ventilation roadway[J]. China Safety Science Journal, 2021, 31(1): 45-51.
[12] ZHANG Hairong, YU Yong . A guidance to grid size design for CFD numerical simulation of hypersonic flows[J]. Procedia Engineering, 2013, 67(2):178-187.

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