Abstract In order to investigate the effects of turbulent airflow from coal cutting (TACC) on the pollution characteristics of coal dust, the pollution behaviors of coal dust under the action of system ventilation airflow (SVA) only (Condition 1) and the addition of TACC disturbance (Condition 2) were respectively simulated and verified through a comparison with the field measurement data. The results show that the effects of TACC on the pollution characteristics of coal dust cannot be ignored on the operation site. TACC could not only enhance the turbulent intensity in the flow field, but also induce the positive deviation of airflow. The airflow with a velocity of about 1.0∼1.75 m/s in the footway space moved from the region X=0.3∼36.8 m, Y=4.1∼4.5 m under Condition 1 to the region X=-5.1∼26.5 m, Y=3.8∼4.5 m under Condition 2. After the addition of TACC disturbance, the absolute value of positively-deviated airflow velocity component in the operational range of rear drum driver rose from 0∼0.8 m/s to 0.2∼1.8 m/s. Meanwhile, the flow field under Condition 2 could effectively cause lateral dispersion of coal dust to the footway space, which led to an increase in the lateral dispersion scale of coal dust. Under Condition 2, the region polluted by cutting-induced coal dust moved forward by 11.3 m along the negative direction of X-axis, and the peak coal dust concentration along the footway space was approximately doubled.

中文翻译：

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综采工作面采煤湍流气流下煤尘污染特征CFD对比分析

摘要 为研究切煤湍流（TACC）对煤尘污染特性的影响，研究仅在系统通风气流（SVA）作用下（条件1）和添加TACC的煤尘污染行为。通过与现场测量数据的比较，分别对扰动（条件2）进行了模拟验证。结果表明，在作业现场，TACC对煤尘污染特性的影响不容忽视。TACC不仅可以增强流场中的湍流强度，还可以诱导气流的正偏差。人行道空间中速度约为 1.0∼1.75 m/s 的气流从条件 1 下的区域 X=0.3∼36.8 m, Y=4.1∼4.5 m 移动到区域 X=-5.1∼26.5 m, Y=条件 2 下为 3.8∼4.5 m。加入TACC扰动后，后鼓驱动器工作范围内正偏差气流速度分量的绝对值从0～0.8 m/s上升到0.2～1.8 m/s。同时，工况2下的流场能有效地引起煤尘向人行道空间横向扩散，导致煤尘横向扩散规模增大。工况2下，切削煤尘污染区域沿X轴负方向前移11.3 m，人行道空间煤尘浓度峰值约增加一倍。工况2下的流场能有效地引起煤尘向人行道空间横向扩散，导致煤尘横向扩散规模增大。工况2下，切削煤尘污染区域沿X轴负方向前移11.3 m，人行道空间煤尘浓度峰值约增加一倍。工况2下的流场能有效地引起煤尘向人行道空间横向扩散，导致煤尘横向扩散规模增大。工况2下，切削煤尘污染区域沿X轴负方向前移11.3 m，人行道空间煤尘浓度峰值约增加一倍。