Numerical simulation of gas explosion flow field characteristics and influencing factors in pipelines
ZHU Zhao
Abstract：Propagation rules and flow field characteristics of gas explosion were simulated by numerical simulation method in order to improve the security protection of coal mine gas drainage system.The distribution regularities of gas explosion flow field on the temperature,pressure,velocity and reaction rate and the effect of pipe diameter,structure and length on reaction rate were investigated by eddy-dissipation model.The results show that both the reaction rate wave front and the temperature wave front are in the shape of "＜",and the confinement of tube wall leads to the increase of reaction rate.Speed and pressure waves are overlapped and ahead of the reaction rate and temperature waves.The smaller the diameter,the greater the reaction rate.The reaction rate increases at the bent of pipeline,which is 5 times of straight pipes with the same diameter.The longer the pipe length,the greater the maximum reaction rate peak,and the more violent explosive reaction.These factors should be taken into account to the safety protection of gas drainage system as the intensity of gas explosion in pipeline is greatly affected by pipe diameter,length and structures.
Keywords：gas explosionnumerical simulationeddy-dissipation modeflow field characteristicsreaction rate
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 300-305 )