Numerical Simulation On Influence Of Pipeline Attribute On Gas Explosion Wave Propagation

Gas explosion in coal mine which can caused more deaths is a a huge threat for mine safety production. On the basis of previous studies, numerical simulation methods for gas explosion and the influence of pipeline properties on flame and shock wave propagation were studied by computational fluid dynamics software Fluent, and it provided a theoretical basis for prevention and harm reduction. In this paper, based on the results of previous studies, gas explosions in the pipeline physical and mathematical models was established, the finite rate/eddy dissipation model to deal with gas/air premixed gas explosion was used, and used SIMPLEC algorithm processing pressure-velocity coupling relationship, selected the large eddy model as a turbulence model to improve the precision of numerical simulation. In the condition of verifying the simulation result effectiveness, the gas/air mixture explosion was simulated in the condition of different sizes and different cross sectional shape in a closed pipe. The results showed that shock waves pressure and the pressure rate of rise increase throughout the gas explosion process; the development of shock wave become slow with the increasing of pipeline diameter, and turbulence intensity becomes small. maximum pressure of shock wave for rectangular pipe is always lower than that of the circular pipe,and the rate of increase is slightly lower than that of circular pipes.