Numerical Analysis on Propagation and Attenuation of Shock Waves in Bidirectional Turn Roadway during Gas Explosion

摘要

The propagation of shock waves in roadway is one of the most basic problems which can be used to study the damage effects and attenuation during gas explosion. On the basis of some hypothesis, the physical and mathematical models of shock waves propagation are set up in bidirectional turn roadway. The results of numerical simulation show that the pressure, velocity and temperature of shock wave will be attenuated during propagation. At the beginning of gas explosion and shock propagation, the pressure, velocity and temperature in wave front are increased gradually and attenuated by the wall friction drag with the end of the chemical reaction. Especially in the bidirectional turn roadway, the shock wave is attenuated to a great extent. The results of experiment and simulation show that, the pressure in wave front is largely lowered by the turn. Moreover, the attenuation coefficient of shock wave is 1.29 for the 45o bidirectional turn, 2 for the right angle. Through the contrast of experiment, simulation and practice, the highly identical data shows that the numerical model is practicable.