فهرست نشریات علمی دسترسی آزاد ایران

Ventilation of extended blind drifts with small cross-sections is a critical challenge for mining safety. Traditional schemes with fans in series within a continuous duct often lead to vacuum pressure zones and recirculation of contaminated air. This study justifies a novel cascade ventilation method using fans distributed along a flexible pipeline with organized breaks between sections. A comparative analysis demonstrated the advantage of flexible ducts, showing a leakage coefficient of 1.57 versus 3.16 for rigid ones over 5500 m. CFD modeling in ANSYS CFX (SST turbulence model) was used to investigate the influence of key geometric parameters of the break: the diameter of the confuser at the receiving section (D₂ = 1.5–3.5 m) and the distance between sections (L = 1.5–2.5 m). Results established that a decrease in D₂ and L reduces the recirculation level. The optimal configuration (D₂ = 1.5 m, L = 1.5 m) achieved a minimum recirculation ratio of 4.61%. Based on the Generalized Reduced Gradient (GRG) method, a calculation dependency (1) was developed to link system parameters with recirculation. The formula's prediction error was 4.2% against CFD data. The practical significance lies in providing an engineering tool for designing effective ventilation systems that prevent vacuum zones and minimize the accumulation of hazardous substances.