Application of Motion Reference Frame on Numerical Simulation of Mine Piston Wind

摘要

This paper illustrates the numerical simulation of piston wind and its application in the ventilation of mining tunnels. As is known, the stability and safety of mining ventilation system has become ever more important with the mechanization and automation of mining management. And, specifically speaking, the piston wind system has also become an important influential factor to guarantee the effectiveness and safety of the whole ventilation system for mining conveyance. It is just for these reasons that we have analyzed the influential factors of piston wind by using k-s turbulence model based on the motion reference frame in FLUENT commercial software, and studied the simulating velocities and pressure fields of the air current in the mining tunnel so as to gain a deeper understanding of the piston wind working principle. The results of numerical simulation helps us to gain the following accurate situations and data, that is, since the strengths of the piston wind are different from point to point in the tunnel, there must be a point between the rear and the front of the ventilation conveyance where the wind velocity keeps higher than those in other areas. Moreover, since the block dimension of the speed at the rear area proves bigger than that in the front, the flowing direction of the conveyance has actually had a great influence on the piston wind. In addition, since the strength and the form of pressure have also had a close relation with the situation for it is symmetrical in the X-axis direction and there must be the symmetrical characteristic destruction in the Yaxis direction. Thus, the piston wind in the mining tunnel is by nature the air source in the mining ventilation system, which may lead to great difference in the air current at the drift sections. Therefore, it is of particular significance to consider the effect of piston wind when deciding the passing amount of the wind in the tunnel so as to guarantee the measuring accuracy. Besides, as there exists big difference between the velocity area and the pressure area, the pressure difference can therefore become a driving force to form the inside air current distribution. Hence, the above simulation results are expected to give us hints to further analysis of the influential factors of mining ventilation system so as to ensure the production safety and deeper understanding of the nature and behavior of the underground mining operations.