| 摘要: |
| 本文研究考虑底部过流条件的透水框架群阻力系数计算方法。将透水框架视为大尺度粗糙结构体,以入侵深度下界面为分界线,水流沿垂向被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公式。开展透水框架水槽试验,利用47组试验数据对公式进行验证,通过调整形状参数,最终得出透水框架群阻力系数计算公式。试验表明,当量粗糙度、流量和坡度是透水框架阻力系数影响因素,由偏相关分析发现,流量与阻力系数呈负相关关系,当量粗糙度、坡度与阻力系数呈正相关关系,其中,当量粗糙度是影响其阻力系数大小最主要因素,流量和坡度影响程度相近。 |
| 关键词: 透水框架 大尺度粗糙 透水 特征高度 阻力系数 |
| DOI： |
| 分类号:TV131 |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| Resistance Coefficient Equation for Permeable Tetrahedron Frames |
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LIU Jianhua1, YANG Zhonghua1, LI Da1, LI Ming2
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1.State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University;2.Changjiang Waterway Institute of Planning and Design
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| Abstract: |
| The goal of this study is to suggest a new resistance coefficient equation for permeable tetrahedron frames (PTF).PTF were taken as large-scale roughness in this research. Using the penetration depth, turbulent flow over large-scale roughness was vertically divided into two layers: permeable layer and free-flow layer. The resistance equation considering roughness area and seepage effect in the bottom was purposed with this two-layer model. Sink experiments of PTF were set up. By adjusting a shape factor, the equation was validated by 47 sets of experimental data. The results showed that under the same volume of frame laying conditions, the drag coefficient obtained with a plurality of lower volume frames is larger than that of a single type of frames. Equivalent roughness, flow rate and slope are the factors affecting the resistance coefficient of the PTF. Partial correlation analysis showed that the flow rate and the drag coefficient are negatively correlated. The equivalent roughness, slope and drag coefficient are positively correlated. Among them, equivalent roughness is the most important factor while flow rate and slope have similar influence extent. |
| Key words: permeable tetrahedron frames large-scale roughness permeable characteristic height resistance coefficient |
