Research on evaluation method for airflow control effect of long-pressure and short-suction dust removal system in heading faces.

This study proposes a novel "B" coefficient to quantitatively assess the uniformity of airflow fields in coal mine heading faces equipped with the long-pressure and short-suction dust control system. The research systematically investigates the relationship between the radial-to-axial airflow ratio, the proposed uniformity coefficient, and dust suppression efficiency. The results demonstrate that increasing the radial-to-axial airflow ratio from 0.5 to 1.5 leads to a gradual reduction in airflow field uniformity while significantly enhancing dust removal performance. Specifically, the dust removal efficiency improves by 37.7% at the driver's operating position and by 27.7% at a location 5 m behind the driver. The study reveals a distinct nonlinear relationship between the "B" coefficient and dust control effectiveness, highlighting the critical role of airflow field optimization in dust suppression. These findings validate the practical applicability of the "B" coefficient as an evaluation metric for airflow regulation in long-pressure and short-suction systems. The proposed method offers a scientifically grounded approach for assessing and improving dust control strategies in coal mining operations, addressing a longstanding gap in quantitative airflow field analysis for heading face ventilation systems. The research outcomes provide valuable theoretical guidance and technical references for optimizing dust control parameters in similar mining environments.