Study On The Propagation Regulation Of Gas Explosion Shock Wave At Unidirectional Bifurcation Of Pipeline In Non-combustion Zone

Gas explosion accident is one of the most serious disasters in coal mining in our country. With the improvement of mechanization and the deepening of coal mining depth, the gas emission increase, which will increase the probability of gas explosion accident.Gas explosion accident not only cause damage to property which restricts the development of national economy, but also threaten the life safety of the coal mine workers. Therefore, the study of gas explosion is of great important practical application value. Aiming at the status quo, the experimental result is significantly meaning to prevent and control the damage of shock wave and damage effect in the research of the propagation regulation of gas explosion shock-wave in the one-way bifurcation pipe.Based on the theory of gas explosion, using two kinds of research methods in experimental study and numerical simulation, studying at the propagation characteristics of the gas explosion wave in the branch pipelines of the non- combustion zone and the distribution condition of gas explosion wave after bifurcation pipe, the results provide theoretical and technical support in prevention and control the destruction and damage of the explosion shock wave and coal rescue decision of gas explosion accident.On the basis of predecessors’ research results, analyses the propagation characteristics of gas explosion shock wave, introduces the mechanism of gas explosion,propagation characteristics of gas explosion shock wave and main influence factors.Gas explosion on the space can be divided into two area: gas combustion area and non-gas combustion area.This paper, using a square pipe of 80mm×80mm section gas explosion experimental equipment in China University of Mining Technology, analyzed the propagation characteristics of the gas explosion wave in the unidirectional bifurcation pipelines of the non- combustion zone respectively from different angles,obtained the propagation law of the gas explosion wave in the unidirectional bifurcation pipelines of the non- combustion zone, found the shunt coefficient of the gas explosion wave in non- combustion zone is relevant to the gas pipeline filling length of the shock-wave and tunnel bifurcation angle.Based on the basic principle of fluid dynamics, the bifurcation pipe gas explosionpropagation processed the suitable simplification and the reasonable assumptions, the numerical simulation software Fluent is used to calculate the overpressure change law of the gas explosion wave in the unidirectional bifurcation pipelines of the noncombustion zone, obtained the pressure distribution under the condition of bifurcation of gas explosion wave, and directly determined the shock wave pressure distribution of the bifurcation pipe. Through comparison between the simulated results and the experimental results, verify the reliability of the results of numerical simulation. The research results of this paper enrich the theory of gas explosion shock wave propagation,provides a theoretical basis for the control measures in gas explosion accident, rescue and relief work. As well as provide certain guidance for the mine drift layout and the reduce of the loss of gas explosion disasters.