Study on the mechanism of gas wind pressure induced wind flow oscillation after outburst disaster

ZHOU Aitao1,2; HU Jiaying1,2; WANG Kai1,2; DU Chang'ang1,2; LEI Huan1,2

doi:10.13272/j.issn.1671-251x.17832

Gong-kuang zidonghua (Sep 2021)

Study on the mechanism of gas wind pressure induced wind flow oscillation after outburst disaster

ZHOU Aitao1,2,
HU Jiaying1,2,
WANG Kai1,2,
DU Chang'ang1,2,
LEI Huan1,2

Affiliations

ZHOU Aitao1,2: 1.Beijing Key Laboratory for Precision Mining of Intergrown Energy and Resources, China University of Mining & Technology(Beijing), Beijing 100083, China; 2. School of Emergency Management and Safety Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China
HU Jiaying1,2: 1.Beijing Key Laboratory for Precision Mining of Intergrown Energy and Resources, China University of Mining & Technology(Beijing), Beijing 100083, China; 2. School of Emergency Management and Safety Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China
WANG Kai1,2: 1.Beijing Key Laboratory for Precision Mining of Intergrown Energy and Resources, China University of Mining & Technology(Beijing), Beijing 100083, China; 2. School of Emergency Management and Safety Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China
DU Chang'ang1,2: 1.Beijing Key Laboratory for Precision Mining of Intergrown Energy and Resources, China University of Mining & Technology(Beijing), Beijing 100083, China; 2. School of Emergency Management and Safety Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China
LEI Huan1,2: 1.Beijing Key Laboratory for Precision Mining of Intergrown Energy and Resources, China University of Mining & Technology(Beijing), Beijing 100083, China; 2. School of Emergency Management and Safety Engineering, China University of Mining & Technology(Beijing), Beijing 100083, China

DOI: https://doi.org/10.13272/j.issn.1671-251x.17832
Journal volume & issue: Vol. 47, no. 9
pp. 32 – 37

Abstract

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The wind flow oscillation effect is an important characteristic of the post-disaster mine ventilation network, but there are few studies on the wind flow oscillation phenomenon and there is a lack of in-depth discussion on the wind flow oscillation characteristics. In order to solve the above problems, taking the parallel downward ventilation network as the research object, the oscillation effects of disaster wind flow and gas mass are studied.Based on the damped vibration theory, an open-loop airflow oscillation model is constructed and the Runge-Kuttamethod is used to solve the numerical problem in Matlab software so as to analyze the oscillation characteristics of the gas mass in the parallel roadway. As the initial wind speed increases, the amplitude of the gas mass increases and the impact range of gas in the parallel pipeline is expanded.A similar model of the actual roadway is established to simulate the change of wind speed in parallel roadways with time. The experimental results show that due to the effect of gas wind pressure and ventilator wind pressure, the wind speed repeatedly increases and decreases in the parallel roadways, i.e. wind flow oscillation phenomenon. When the initial wind speed increases from 0.35 m/s to 0.62 m/s, the wind flow oscillation time is shortened from 50 s to 35 s, and the maximum reverse wind speed is changed from -0.4 m/s to -0.12 m/s. This shows that the increase of the initial wind speed is more conducive to the diffusion and discharge of gas mass.The prevention and control measures of wind flow oscillation in parallel inclined gas accumulation shaft are proposed, including imposing wind-blocking measures on the air branch; strengthening local ventilation and increasing wind speed on the gas branch.

gas outburst disaster; mine ventilation network; gas accumulation; wind flow oscillation; gas wind pressure; wind flow turbulence; parallel roadway; initial wind speed

Published in Gong-kuang zidonghua

ISSN: 1671-251X (Print)
Publisher: Editorial Department of Industry and Mine Automation
Country of publisher: China
LCC subjects: Technology: Mining engineering. Metallurgy
Website: http://www.gkzdh.cn/en.htm

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