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露天堆场防风抑尘网的动力学数值模拟

宋翀芳 彭 林 白慧玲 牟 玲 刘效峰

宋翀芳, 彭 林, 白慧玲, 牟 玲, 刘效峰. 露天堆场防风抑尘网的动力学数值模拟[J]. 环境科学研究, 2014, 27(7): 775-781.
引用本文: 宋翀芳, 彭 林, 白慧玲, 牟 玲, 刘效峰. 露天堆场防风抑尘网的动力学数值模拟[J]. 环境科学研究, 2014, 27(7): 775-781.
SONG Chong-fang, PENG Lin, BAI Hui-ling, MU Ling, LIU Xiao-feng. Aerodynamic Numerical Simulation of Turbulent Fields behind Porous Fences in Open Storage Piles[J]. Research of Environmental Sciences, 2014, 27(7): 775-781.
Citation: SONG Chong-fang, PENG Lin, BAI Hui-ling, MU Ling, LIU Xiao-feng. Aerodynamic Numerical Simulation of Turbulent Fields behind Porous Fences in Open Storage Piles[J]. Research of Environmental Sciences, 2014, 27(7): 775-781.

露天堆场防风抑尘网的动力学数值模拟

基金项目: 国家自然科学基金项目(51108295,2)

Aerodynamic Numerical Simulation of Turbulent Fields behind Porous Fences in Open Storage Piles

  • 摘要: 开放性露天堆场的散尘是大气颗粒物的重要来源. 来流空气在棱形物料堆的上部绕流,使其表面的空气流动结构逐点不同,而料堆表面的空气动力学结构又决定着堆场的散尘机理及散尘量. 分析了典型单一棱形料堆周围空气湍流结构,并应用三维标准k-ε紊流模型对其流场进行了数值模拟;计算了来流方向抑尘网前后不同断面处风速的垂直分布;分析了不同孔隙率(0、0.2、0.3、0.4、0.5、0.6和1.0)抑尘网后料堆迎风面和背风面沿高度方向、平顶面沿水平方向的剪切应力特性和分布规律. 结果表明:抑尘网前3倍网高距离处的风速较无网工况(孔隙率为1.0)略有减小,降幅随孔隙率增大而减小, 孔隙率为0时最大降幅为5.1%;网前2倍网高距离处与抑尘网之间区域的风速廓线与无网工况相差甚远,孔隙率为0时近网区域风速最高降幅达92.8%. 抑尘网和料堆迎风面之间区域,从地面至网顶高度,不同孔隙率抑尘网工况下的风速均较无网工况小,最小处为无网工况风速的18.5%;抑尘网以上区域的风速较无网工况的大,最大处为无网工况风速的128.0%,并且差距随抑尘网孔隙率的减小而增大. 料堆剪切力分布显示,其迎风面和平顶面为主要散尘面,背风面被涡旋卷起的扬尘量较前两者小得多. 防风抑尘网的设置改变了料堆周围空气的流动结构和受力分布,对不同孔隙率的抑尘网数值模拟结果可知,0.2和0.3为最佳孔隙率.

     

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出版历程
  • 收稿日期:  2013-10-27
  • 修回日期:  2014-03-06
  • 刊出日期:  2014-07-25

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