气幕均匀性影响因素及其隔尘效果研究
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(1 首都经济贸易大学管理工程学院,北京 100083;2 北京科技大学土木与资源工程学院,北京 100083)

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Research on the Factors Influencing the Uniformity of Air Curtain and Its Dust Separation Effect
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(1 School of Management and Engineering, Capital University of Economics and Business,Beijing 100083,China; 2 School of Civil and Engineering, University of Science and Technology Beijing, Beijing 100083, China)

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    摘要:

    近年来,空气幕作为一种有效隔绝易于扩散粉尘的装置,被频繁的用于矿山、隧道施工过程中产尘较多的场所,而均匀的气幕会带来更佳的隔尘效果。运用Fluent数值模拟结合相似实验的方法分析了气幕直径和气幕内部风道结构变化对气幕均匀性的影响,并将设计后可以均匀供风的气幕安装在实际施工隧道模型中模拟分析其隔尘效果。结果表明:直径增加,供风装置内气流轴向惯性力降低,有充足的时间改变流出方向,气幕装置轴向静压更加均匀,形成气幕更加均匀,但直径的变化对气幕均匀性的影响不是线性变化的,即存在一个临界直径使直径继续增加对均匀性的改善效果不明显,并且气幕临近直径的范围会随供风装置长度的增加而增加;在长度1m、临界直径180mm的气幕装置基础上,依据风道设计原理安装计算出的弧高为149.9mm的楔形扇面阻体后,气幕装置内部平均压力梯度从38.4Pa/m降低到19.3Pa/m,出口风速均匀度从87.6%提高到了93.2%,气幕均匀性显著提升;安装气幕后,隔尘区域内回弹的含尘气流被阻隔,区域内风流变得混乱复杂、涡流增加,粉尘停留时间增加,相对较大的粉尘颗粒有更长的时间沉降。整个隔尘区域粉尘浓度明显升高,气幕隔尘效果显著。

    Abstract:

    Recently, air curtains, as a device to effectively isolate easily diffused dust, have been frequently used in mining and tunneling construction process where more dust is produced, while a uniform air curtain will bring better dust isolation effect. Fluent numerical simulation combined with similar experimental methods were used to analyze the effect of changes in the diameter of the air curtain and the air duct structure inside the air curtain on the uniformity of the air curtain, and the air curtain designed to supply air uniformly was installed in the actual construction of the tunnel model to simulate and analyze the effect of its dust insulation.Results show that: the diameter increases, the airflow axial inertia force inside the air supply device decreases, which gives sufficient time to change the outflow direction. Meanwhile, the axial static pressure of the air curtain device is more uniform to form a more homogeneous air curtain. However, the influence of the diameter change on the homogeneity of the air curtain is not linear, i.e., there exists a critical diameter, which makes the improvement of the homogeneity of the diameter continue to increase insignificantly, and the range of the diameter of the air curtain increases with the increase of the length of the air supply device.On the basis of the air curtain device with a length of 1m and a critical diameter of 180mm, after installing the wedge-shaped fan-shaped blocking body with a calculated arc height of 149.9mm according to the principle of air duct design, the average pressure gradient inside the air curtain device was reduced from 38.4Pa/m to 19.3Pa/m, and the uniformity of the outlet wind speed was increased from 87.6% to 93.2%, and the uniformity of the air curtain was significantly improved;Finally, after installing the air curtain, the rebound dusty airflow in the dust isolation area was blocked, and the airflow in the area became chaotic and complex with increased vortex, and the dust retention time was increased to allow a longer time for the relatively large dust particles to settle. The dust concentration in the whole dust isolation area increased significantly, and the effect of air curtain dust isolation is remarkable.

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王佩,蒋仲安,王慧.气幕均匀性影响因素及其隔尘效果研究[J].防灾减灾工程学报,,():

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  • 在线发布日期:2023-12-14
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