Dynamic analysis of airflow oscillations in inclined parallel roadways of coal mine ventilation systems

Physics of Fluids, Journal Year: 2025, Volume and Issue: 37(3)

Published: March 1, 2025

In coal mining, mine ventilation systems are susceptible to interference from high-concentration gas, which may induce airflow oscillations. Investigating these mechanisms is critical for ensuring safety. Given the limited research on oscillations in open-loop systems, this study comprehensively examined oscillation behavior such systems. We established control equations branch developed and validated a numerical analysis method, derived patterns during downward parallel inclined roadways, analyzed effects of initial velocity through parametric studies. Additionally, oscillatory conditions were simulated. The results indicated that increasing reduced frequency duration. At velocities 0.35and 0.5 m/s, reversal occurred branch; at 0.65 observed, while no significant detected approximately 1 m/s. contrast, roadway inclination angle amplified magnitude extended When reached 30°, both branches exhibited multiple fluctuations, with amplitudes significantly larger than those observed 15° 20°. These findings provide insights preventing controlling underground oscillations, ultimately enhancing

Language: Английский

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A New Proportional-Integral-Derivative Automatic Control Method Complemented by Computational Fluid Dynamics for Gas Concentration in the Tunneling Face

Arabian Journal for Science and Engineering, Journal Year: 2025, Volume and Issue: unknown

Published: April 18, 2025

Language: Английский

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Experimental and numerical analysis of high-pressure gas-driven rock particle impact and fragmentation rock technology

Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(12)

Published: Dec. 1, 2024

Aiming at the problems of fast tool wear and low tunneling efficiency in hard rock process, a granite particle impact breaking technology is proposed to mass face advance reduce wear. By simulating process breaking, feasibility verified. The velocity new surface area were obtained by high-speed camera three-dimensional scanner test. influence factors gas pressure quality analyzed. It concluded that increasing can effectively increase failure improve effect. Improving particles does not continuously kinetic energy. When product energy reaches critical value, continuing will damage effect granite. impacting shows linear relationship with area.

Language: Английский

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Resilience analysis of mine ventilation cyber-physical fusion system

The Journal of Supercomputing, Journal Year: 2024, Volume and Issue: 81(1)

Published: Oct. 22, 2024

Language: Английский

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