Characteristics of gas explosion flow fields in complex pipelines  

作　　者：Zhu Zhao Jia Zhenyuan Luo Haizhu 

机构地区：[1]School of Mechanical Engineering, Dalian University of Technology [2]Shenyang Branch, China Coal Research Institute

出　　处：《International Journal of Mining Science and Technology》2015年第1期157-164,共8页矿业科学技术学报（英文版）

基　　金：supported by National Natural Science Foundation of China (No. 51174113);National Key Basic Research and Development Program (No. 2011CB201206);National Key Scientific Apparatus Development of Special Item (No. 2012YQ24012705)

摘　　要：The explosion flow field in five straight pipes with different diameters and one bending pipe selected from a domestic coal mine are studied by the method of numerical simulation. And the results show that,both in the straight and bending pipes, the pressure wave and velocity wave are accelerated by the rising of reaction rate. As the explosion progressed, with the temperature reaching approximately 3000 K, only one pressure wave and one reaction rate wave were observed, while several velocity waves were found.The larger diameter presented the highest relative pressure as well as the largest velocity increase and subsequent decrease inside the tube. The bent pipes caused both turbulence and kinetic energy to increase, resulting in the acceleration of the reaction rate. The burning time was 7.4% shorter than the burning time observed for the straight pipe. Based on these results, designing one explosion resistance device, and in the practical engineering applications, it was to be proved to meet the security requirements fully.The explosion flow field in five straight pipes with different diameters and one bending pipe selected from a domestic coal mine are studied by the method of numerical simulation. And the results show that, both in the straight and bending pipes, the pressure wave and velocity wave are accelerated by the rising of reaction rate. As the explosion progressed, with the temperature reaching approximately 3000 K, only one pressure wave and one reaction rate wave were observed, while several velocity waves were found. The larger diameter presented the highest relative pressure as well as the largest velocity increase and subsequent decrease inside the tube. The bent pipes caused both turbulence and kinetic energy to increase, resulting in the acceleration of the reaction rate. The burning time was 7.4% shorter than the burning time observed for the straight pipe. Based on these results, designing one explosion resistance device, and in the practical engineering applications, it was to be proved to meet the security require- ments fully.

关 键 词：ExplosionNumerical simulationAccelerationReaction rate 

分 类 号：TD771[矿业工程—矿井通风与安全]