防风网对煤堆遮风效果的风洞实验研究

为了考察防风网对堆场煤堆的遮风效果，进行了防风网与煤堆之间区域的流场可视化实验。使用风洞模拟大气边界层条件，并将开孔率为38．5％的防风网模型布置在煤堆模型前方。实验中采用粒子成像测速（PIV）系统测量了防风网和堆场区域的平均风速分布，并且获得了煤堆表面的摩擦风速分布，进一步估算煤堆起尘量的变化情况。实验发现，防风网可有效降低煤堆表面迎风区域的摩擦风速，而对背风面的流场分布影响较小。研究结果可为防风网的遮护作用提供一定的实验支持。

Wind tunnel observation on the effect of a porous fence on shelter of a triangular coal pile

To investigate the shelter effect of a porous fence on wind erosion in the coal-pile storage yard,the turbulence flow around this region was visualized experimentally. A wind fence （ε = 38.5%） was installed in front of a two-dimensional triangular prism pile in a simulated at- mospheric boundary layer （ABL）. A particle image velocimetry （PIV） system was employed to visualize the instantaneous velocity of the flow around the fence and prism. The mean velocity and friction velocity around the pile were analyzed and compared with the case of no fence, and also, the quantity of dust emission released to the atmosphere was evaluated. The porous fence was found to be effective in reducing the friction velocity of the flow along the windward surface of the pile, thus abating further evolution of dust emission. The present experimental results can provide useful information to enhance the understanding of shelter effect of the wind fence.