Research on propagation characteristics of methane-air explosion shock wave in multi-branch roadway
Z.-L. Wu1,2, J.-L. Gao3, Y.-T. Li1,2
1College of Safety and Ocean Engineering, China University of Petroleum, Beijing, China
2Key Laboratory of Oil and Gas Safety and Emergency Technology, Ministry of Emergency Management, Beijing, China
3School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo, China
Keywords: branch structure, gas explosion, overpressure, numerical simulation, safety
Abstract
Based on the large-eddy-simulation (LES) turbulence model, the shock wave propagation process in the roadway with branch structure was studied, focusing on the changes of overpressure under different explosion intensities and a different number of branches. Four conditions of gas accumulation length of 5, 10, 15, and 20 m are used in four models to reveal the influence of the branch structure. The results show that the shock attenuation coefficient of the main roadway no longer changes linearly with the gas accumulation length when there are branch structures in the roadway. When the gas accumulation length is constant, the increase of the number of branches can effectively reduce the rise rate of the impact overpressure value within a certain propagation distance. The overpressure in the branch roadway away from the explosion site is less affected. Due to the influence of multi-branch structure of adjacent roadway, its fluctuation is more chaotic than that of main roadway.
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