Analysis on the Influence of the Diameter of the Suction Air Inlet of the Air Duct on the Wind Flow Field

Abstract

The comprehensive excavation face is the most seriously polluted place in the underground of coal mine. Using FLUENT software to simulate the influence of the diameter change of the suction air inlet of the extraction duct on the airflow field in the long pressure short draft ventilation system, the roadway in the comprehensive excavation was taken as the research object. From the simulation results, it can be seen that the diameter of the air intake directly affects the air flow distribution in the roadway, the change of the diameter of the suction nozzle will interfere with the inrush jet, Which has the greatest influence on the wind speed within the range of 0-10m from the excavation end. At the same time, it has obvious influence on the vortex in the roadway. When the diameter of the suction air outlet increases from 0.5m to 0.6m, the vortex area decreases, and when the diameter increases from 0.6m to 1.0m, the vortex area gradually expands.