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

作　　者：Zhu Chuanjie Lin Baiquan Ye Qing Zhai Cheng 

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

出　　处：《Mining Science and Technology》2011年第3期365-369,共5页矿业科学技术（英文版）

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 （Sf） and peak overpressure （ΔPmax） 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 ΔPmax and Sf. In addition, the propagation characteristics in a U-shaped pipe were similar to those in a Z-shaped pipe and the values of APmax and Sf 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.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：Gas explosion Turning Flame speed Peak overpressure Explosion propagation 

分 类 号：TD712.7[矿业工程—矿井通风与安全] TN011[电子电信—物理电子学]