Regularity Of Gas Distribution In Sloping Heading Face With Auxiliary Ventilation

With mine coal extractive depth increasing gas disasters problem worsening. In order to effectively control gas explosion and gas outburst accidents caused by gas accumulation,we must accurately predict mine gas distribution in mine laneway.But the gas distribution is influenced by the airflow.So, we must study on airflow in mine laneway. In the process of simulating the heading face airflow field, the turbulence energy k and dissipation rateεhas different calculation methods in the flow field entrance when fully developed areas are in RNG model for a numerical simulation of airflow distribution. This article Simulated the flow field with different turbulent kinetic energy k and dissipation rateεvalues, and compared with the experimental results, determined the turbulent kinetic energy k and dissipation rateεcalculation method in auxiliary ventilation field simulation calculating,obtained the heading face flow field close to the actual.based on the heading face flow field, determined the mathematical model of the gas and air mixture in sloping heading face, The influence of the angle of inclination and quantity of ventilation airflow to methane distribution is studied.It is shown that, if the average methane concentration in return airflow is lower , there is still a range of high-concentration methane area in sloping heading face. the zone with high concentration gas is larger in upward heading face than that in downward heading face. The difference in zone with high concentration methane becomes decreases with the increase of the air quantity and methane emission rate if the average methane concentration in return airflow is same. But the zone with high concentration methane in upward heading face is still larger than that in downward heading face with forced auxiliary ventilation. if the angle of inclinationand the gas emission in sloping heading face are the same.The airflow quantity required to eliminate methane collection is greater at upward heading face than at downward heading face.