风门开启角度对矿井风流的影响规律研究
Study on the Influence Law of Damper Opening Angle on Mine Wind Flow
为进一步探究风门开启角度对矿井风流沿程流动时流场的影响规律,采用井下现场测量与数值模拟相结合的方法,研究了风门不同开启角度下风流流动特性的变化规律。研究结果表明:(1)风门前后测点风速先增大后减小,且风门开启角度越小,风流沿程流动过程中速度波动幅度越明显,波动影响范围越大,当风门开启角度小于30°时,风门前测点风速会出现突降后急速拉升的现象;(2)风门开启角度越小,对风流沿程流动的阻碍范围越大,机械能损失越严重,测段通风阻力越大;(3)测段通风阻力变化幅度与风门开启角度之间无明显线性规律;(4)风门开启角度越小,对风流流动过程影响越剧烈,沿程风量损失越大,风量相对变化幅度增大。
To further investigate the impact of the damper opening angle on the flow field within the mine’s air flow, this study examined variations in wind speed, pressure, and air volume along the air flow under different damper opening angle in a long straight roadway. This was achieved through a combination of underground field measurements and numerical simulations. The study aimed to summarize the patterns of wind flow characteristics and analyze the underlying causes. The findings indicate that: (1) Wind flow velocity fluctuations are influenced by the damper opening angles. Specifically, wind speed at measurement points before and after the damper initially increases and then decreases. The smaller the damper opening angle, the more pronounced the amplitude of velocity fluctuations, and the greater the extent to which the fluctuation range is affected by the wind flow. When the damper opening angle exceeds 30°, wind speed changes exhibit greater regularity and stability. Conversely, when the opening angle is less than 30°, wind speed in front of the damper briefly decreases before rapidly increasing. (2)The opening angle of the damper significantly affects the ventilation resistance within the measurement section. A smaller damper opening angle results in a greater obstruction to wind flow, the reby intensifying the conversion of kinetic energy into thermal energy, as well as dynamic pressure into static pressure. This leads to a more pronounced mechanical energy loss and an increase in wind resistance within the measurement section. (3)Due to the interplay of factors such as eddy currents and wall friction, there is no clear linear relationship between the change in ventilation resistance and the damper opening angle. (4)The air volume at the measuring point is substantially influenced by the damper opening angle. A smaller opening angle exacerbates the irregular movement of wind flow particles and the impact of vortex areas on the wind flow process, resulting in greater air volume loss along the path, a decrease in air volume at each measuring point, and an increase in the relative change amplitude of the air volume.
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