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首页> 外文期刊>Building and Environment >Research on tunnel ventilation systems: Dust Diffusion and Pollution Behaviour by air curtains based on CFD technology and field measurement
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Research on tunnel ventilation systems: Dust Diffusion and Pollution Behaviour by air curtains based on CFD technology and field measurement

机译：隧道通风系统研究：基于CFD技术和现场测量的气幕扬尘扩散和污染行为

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摘要

In order to further improve an air curtain's dust suppression performance in tunnels, this paper made an in-depth analysis of the effects of an air curtain generator's radial and axial pressure airflow rate and a dust removal fan's exhaust airflow rate on the diffusion and pollution behaviors of dust. Through CFD Technology and field measurements, it can be observed that: when the air curtain generator's axial-to-radial pressure airflow rate ratio (R-a/r) varied within the range of 1/9-6/4, the diffusion distance of high-concentration dust (with a concentration over 10 mg/m(3)) decreased with the decrease of R-a/r; and when R-a/r = 1/9, the formed airflow curtains exhibited the most favorable dust suppression performance. In addition: when the dust removal fan's exhaust-to-pressure airflow rate ratio (R-e/p) increased, the diffusion distance of high-concentration dust decreased; and when R-e/p = 1.2, the dust produced could be suppressed effectively by the air curtains. Finally, field measurements reveal that when a dust removal fan with a R-e/p of 1.2 and an air curtain generator with a R-a/r of 1/9 were used in combination, high-concentration dust can be controlled fully within a range of 5.49 m from the head-on section by the formed air curtains, and the average dust concentration in the region 5-50 m away from the head-on section in tunnel was reduced to 9.82 mg/m(3); i.e., the excavator driver and workers can be protected effectively.
机译：为了进一步提高隧道中空气幕的抑尘性能，本文深入分析了空气幕发生器的径向和轴向压力风量以及除尘风机的排风量对扩散和污染行为的影响。灰尘通过CFD技术和现场测量，可以发现：当风幕发生器的轴向/径向风速比（Ra / r）在1 / 9-6 / 4范围内变化时，扩散距离较大。 -随着Ra / r的降低，粉尘浓度（浓度超过10 mg / m（3））降低；当R-a / r ＝ 1/9时，形成的气流帘表现出最有利的抑尘性能。另外：除尘风扇的排气压力风量比（R-e / p）增加时，高浓度灰尘的扩散距离减小；当R-e / p = 1.2时，可通过气帘有效地抑制产生的粉尘。最后，现场测量表明，当结合使用Re / p为1.2的除尘风扇和Ra / r为1/9的气帘发生器时，可以将高浓度粉尘完全控制在5.49的范围内通过形成的气幕从迎头区开始m处，隧道中远离迎头区的5-50 m区域的平均粉尘浓度降低到9.82 mg / m（3）;即，可以有效地保护挖掘机驾驶员和工人。

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