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Effect of roadway turnings on gas explosion propagation characteristics in coal mines

查看全文 作　　者：Zhu [1,2]Chuanjie;Lin [1,2]Baiquan;Ye [3]Qing;Zhai [1,2]Cheng 高影响力作者 机构地区：[1]State Key Laboratory of Coal Resources and Safe Mining, Xuzhou 221008, China;[2]Faculty of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China;[3]Faculty of Energy and Safety Engneering. Hunan University of Science and Technology, Xiangtan 411201, China高影响力机构 出　　处：《Mining Science and Technology》索引2011年第21卷第3期,共5页高影响力期刊 基　　金：Financial support for this work, provided by the National Natural Science Foundation of China (No.50574093);the Key Program of the National Natural Science Foundation of China (No.50534090);the National Basic Research and Development Program of China (No.2005CB221506);the National Science Foundation for Young Scholars of China (No.50804048);the National Key Technology R&D Program (No.2007BAK29B01) Research Innovation Program for College Graduates of Jiangsu Province;the Open Foundation of State Key Laboratory of Explosion Science and Technology (No.KFJJ10-19M) 摘　　要：In order to reveal the effect of turnings on explosion propagation, experiments were performed in three different pipes (single bend, U-shaped pipe and Z-shaped pipe). Flame and pressure transducers were used to track the velocity at the explosion front. When the pipes were filled with methane, the explosion strength was significantly enhanced due to the turbulence induced by increasing the number of turnings, while the flame speed (S f) and peak overpressure (DP max) increased dramatically. In addition, the strength of the explosion increased in violence as a function of the number of turnings. However, when the bend was without methane, the turnings weakened the strength of the explosion compared with the ordinary pipe, shown by the decrease in the values of DP max and S f . In addition, the propagation characteristics in a U-shaped pipe were similar to those in a Z-shaped pipe and the values of DP max and S f were also close. The results show that the explosion propagation characteristics largely depend on gas distribution in the pipes and the number of turnings. The different directions of the turnings had no effect. 关 键 词：煤矿瓦斯爆炸 传播特性 转弯 火焰传播速度 天然气管道 巷道 爆炸强度 压力传感器
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