刘建华,杨中华,李达,等. 考虑底部过流的透水框架群阻力系数研究[J]. 水利水运工程学报,2020(2):73-78. doi: 10.12170/20190216001
引用本文: 刘建华,杨中华,李达,等. 考虑底部过流的透水框架群阻力系数研究[J]. 水利水运工程学报,2020(2):73-78. doi: 10.12170/20190216001
(LIU Jianhua, YANG Zhonghua, LI Da, et al. Resistance coefficient equation for permeable tetrahedron frames[J]. Hydro-Science and Engineering, 2020(2): 73-78. (in Chinese)). doi: 10.12170/20190216001
Citation: (LIU Jianhua, YANG Zhonghua, LI Da, et al. Resistance coefficient equation for permeable tetrahedron frames[J]. Hydro-Science and Engineering, 2020(2): 73-78. (in Chinese)). doi: 10.12170/20190216001

考虑底部过流的透水框架群阻力系数研究

Resistance coefficient equation for permeable tetrahedron frames

  • 摘要: 研究底部过流条件下透水框架群的阻力系数具有现实意义。将透水框架视为大尺度粗糙结构体,利用入侵深度,建立了大尺度粗糙结构体过流的水动力双层模型,将水流沿垂向分为上部自由流动层和底部透水层,得出考虑底部过水和占用过水面积的大尺度粗糙河床阻力系数计算式。透水框架水槽试验的数据表明,框架群铺设后纵向流速随水深变化的垂向分布呈“S”型。利用47组雷诺数为25 000~50 000的试验数据率定出推导公式的形状系数,最终得出透水框架群阻力系数计算式。

     

    Abstract: The study of resistance coefficient for permeable tetrahedron frames (PTF) with seepage effect is of practical significance. PTF were taken as large-scale roughness in this research. Using the penetration depth, a two-layer dynamic model was established for the turbulent flow over large-scale roughness. The flow was divided into two layers, the permeable layer and the free-flow layer, along the water depth. Considering roughness area and seepage effect in the bottom, the resistance equation was derived with this two-layer model. Flume experiments of PTF were conducted and results present that the vertical distribution of longitudinal velocity is S-shaped when frames are laid. The key parameter, shape factor, was calibrated by 47 sets of data with the Reynolds number ranging from 25,000 to 50,000.

     

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