Flow Field Characteristic Analysis for Auxiliary Ventilation during Different Excavation Stages in Coal Mine

Abstract

Different ventilation modes and layout parameters in coal mine have a great influence on the flow field distribution. Based on the analysis of the key factors of ventilation airflow in excavation roadway, the ventilation and gas coupling flow field simulation was established by finite element method in this paper, and the ANSYS/FLOTRAN software was used to simulate the airflow velocity, pressure field distributions during different stages of excavation. The results show that the airflow speed is small above the horizontal line of the outlet near the roof, which forms a higher gas concentration. Along with the advance of excavation, the pressure in heading face increases, velocity vortex area under the outlet moves toward the heading face, and high gas concentration area moves to the entrance of the roadway. The results of the study can provide theoretical basis for reasonable layout and parameter optimization of the auxiliary ventilation system in coal mine.