| 摘要: |
| 根据桥墩局部冲刷机理，通过桥墩加装环翼式挡板减小局部冲刷的试验研究，分析了加装环翼式挡板后，水流在桥墩四周的垂向水力特性。试验结果表明：桥墩迎流面中心线的垂向速度在安放挡板位置处有拐点。3种形状的挡板中，形状为A1的挡板的近底垂向流速减小幅度最大，影响水流紊动宽度也最大，同时表层垂向紊动强度、近底垂向紊动强度减小幅度也最大。利用CFD软件进行数值模拟分析发现，与物理模型所得结果相吻合。 |
| 关键词: 环翼式桥墩 挡板形状 垂向流速 紊动宽度 垂向紊动强度 数值模拟 |
| DOI： |
| 分类号:U443.22 |
| 基金项目:国家自然科学基金资助项目（51369022）；内蒙古自治区自然科学基金资助项目（2013MS0719） |
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| Impacts of baffle shape of the ring-wing bridge pier on vertical hydraulic characteristics |
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CHEN Yan-mei1, MOU Xian-you1, CHENG Lan-yan2, LI Chun-jiang1
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1.College of Water Conservancy and Civil Engineering， Inner Mongolia Agriculture University;2.Linhe Water Authority of Bayannaoer
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| Abstract: |
| Based on the mechanism of local scour around the bridge pier, a lot of experiments were carried out to analyze the influence of the ring-wing bridge pier′s baffle shape on vertical hydraulic characteristics around the bridge pier. In this paper, 3 baffle shape types are applied in the experiment study. The research results show that the vertical velocity along the center line of the bridge pier′s upstream face has inflection point at the baffle. In 3 baffle shapes, the A1 shape has the best effect with the vertical velocity, the vertical turbulence intensity near the bottom decreases mostly, the vertical turbulence intensity near the surface decreases mostly, and the width of turbulence influencing is the langest. Through the numerical simulation, it is found that the results obtained by the CFD software agree well with the above experiment results. |
| Key words: ring-wing pier baffle shape vertical velocity turbulence intensity width vertical turbulence intensity numerical simulation |
