| 摘要: |
| 水流通过桥墩在桥墩区域形成复杂的三维流场，会对桥墩底部冲刷和桥区通航产生很大的影响，所以控制桥墩紊流区水流形态十分重要。采用RNG κ-ε紊流模型对桥墩绕流进行三维数值模拟，在墩尾设置不同长度导流板，计算分析墩周围的水流紊动强度值。设置导流板后，墩周围X/D=0~5.3断面的水流最大紊动强度值明显减小，而墩后的紊动强度普遍有减小趋势，且长度不同的导流板对同一墩型的绕流控制作用不同。合适长度的导流板能束窄紊动强度变化值σ＞0.1的范围，即能减小紊流宽度。 |
| 关键词: 桥墩 导流板 紊动强度 数值模拟 |
| DOI： |
| 分类号:U443.2 |
| 基金项目: |
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| Impacts of diversion vanes on characteristics of turbulent flow around the piers |
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XIE Gang-wei
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School of Hydraulic Engineering， Changsha University of Science and Technology
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| Abstract: |
| Water flows pass through the bridge piers and form a complex three-dimensional flow field in the pier area， which has great impacts on scouring at the bottom of the pier and on navigation in the bridge area； therefore， it is very important to control the flow regime in the turbulent region of the piers. The RNG κ-ε turbulente model is adopted for three-dimensional numerical simulation of flow around the pier. The values of intensity of turbulence around the pier are calculated and analyzed when the diversion vanes of different lengths are set at the end of the pier. After the diversion vane is placed， the maximum turbulence intensity at the X/D=0~5.3 cross-sections around the pier decreases significantly， and the turbulence intensity behind the pier generally reflects a decreasing trend. Besides， the diversion vanes of different lengths have different control effects on the current around the same pier. And the diversion vane of the appropriate length can narrow the range of the turbulence intensity of σ＞0.1， which means the reduction of the width of the turbulent flow. |
| Key words: pier diversion vane turbulence intensity numerical simulation |
