Determination of optimal blowing-to-suction flow ratio in mechanized excavation face with wall-mounted swirling ventilation using numerical simulations

Abstract Wall-mounted swirling ventilation is a new type of system in mechanized excavation faces with dust suppression performance that closely related to the blowing-to-suction flow ratio. Physical and simulation models were developed according No. C103 face Nahe Coal Mine Baise Mining Bureau, Guangxi Province optimize ratio for wall-mounted ventilation. Both k-ε turbulence model discrete phase utilized simulate airflow field structures concentration distribution patterns at various ratios. The results suggest higher ratios increase disturbance around working weaken intensity axial air curtain. On other hand, both radial curtain effect are enhanced. At 0.8, achieved most favorable performance. total respirable had their lowest concentrations maximum efficiencies reducing types 90.33% 87.16%, respectively.