| 河道型水库干支流交汇段水力特性数值分析 |
| |
| 引用本文： | 陆建宇,毛劲乔,龚轶青,蔡海滨,曹青,戴会超,闫杰.河道型水库干支流交汇段水力特性数值分析[J].排灌机械工程学报,2019,37(9):776-781. |
| |
| 作者姓名： | 陆建宇 毛劲乔 龚轶青 蔡海滨 曹青 戴会超 闫杰 |
| |
| 作者单位： | 1. 国家电网公司华东分部, 上海 200120; 2. 河海大学水利水电学院, 江苏 南京 210098; 3. 卡迪夫大学工程学院, 英国 卡迪夫 CF24 3AA; 4. 中国电力工程顾问集团西北电力设计院有限公司, 陕西 西安 710075 |
| |
| 摘 要： | 以典型河道型水库库区主流与支流交汇段几何尺寸与来流条件为参照,建立了三维概化数学模型并开展多情景数值分析,以揭示不同交汇角对干支流交汇段关键水力特性变化的影响.重点研究了交汇角α分别为30°,60°,90°,120°,150°的5种工况,计算结果表明:在不同交汇角条件下均存在紊动能高值集中区域,且紊动能与交汇角大小存在正相关关系,即随着交汇角增大,紊动能峰值区域的面积及峰值大小显著增大;不同交汇角条件下床面切应力最大值均由交汇口向支流上游沿程递减,而当α<90°时断面流速变异系数沿程先增大后减小,当α≥90°时断面流速变异系数沿程减小;另外,当α<90°时,床面切应力和断面流速变异系数与交汇角大小存在负相关关系,而当α≥90°时,这2个特性指标随着交汇角增大而递增.
|
| 关 键 词： | 河道型水库 干支流交汇 交汇角 紊动能 床面切应力 变异系数 |
| 收稿时间： | 2017-12-29 |
Numerical analysis of hydrodynamic characteristics in confluence of mainstream with a tributary in a river-type reservoir |
| |
| LU Jianyu,MAO Jingqiao,GONG Yiqing,CAI Haibin,CAO Qing,DAI Huichao,YAN Jie.Numerical analysis of hydrodynamic characteristics in confluence of mainstream with a tributary in a river-type reservoir[J].Journal of Drainage and Irrigation Machinery Engineering,2019,37(9):776-781. |
| |
| Authors: | LU Jianyu MAO Jingqiao GONG Yiqing CAI Haibin CAO Qing DAI Huichao YAN Jie |
| |
| Institution: | 1. East China Branch of State Grid Corporation, Shanghai 200120, China; 2. College of Water Conservancy and Hydropower Enginee-ring, Hohai University, Nanjing, Jiangsu 210098, China; 3. School of Engineering, Cardiff University, Cardiff CF24 3AA, United Kingdom; 4. Northwest Electric Power Design Institute Co., Ltd. of China Power Engineering Consulting Group, Xi′an, Shaanxi 710075, China |
| |
| Abstract: | Based on the geometry of the confluence of the mainstream with a tributary and their hydrological conditions in a typical river-type reservoir, a three-dimensional hydrodynamic model was developed to investigate the impact of intersectional angle of the tributary with the mainstream on hydrodynamic characteristics in the confluence. Five scenarios were focused in terms of 30? 60? 90? 120? and 150?intersectional angles, respectively. The results illustrate that there is always a high concentration region of turbulent kinetic energy at these intersectional angles, and a positive correlation exist between the turbulent kinetic energy and the angle, that is, both the high turbulent kinetic energy region size and value increase significantly with increasing angle. The maximum bed shear stress always decreases from the confluence to the upstream of the tributary at various intersectional angles. If the angle is less than 90? the coefficient of variation of stream velocity increases first and then decreases from the confluence to the upstream; otherwise the coefficient decreases steadily towards the upstream. Additionally, if the angle is less than 90? both the bed shear stress and the coefficient of variation exhibit a negative correlation with the angle, or a positive correlation exists between them. |
| |
| Keywords: | river-type reservoir confluence intersection angle turbulent kinetic energy bed shear stress variation coefficient |
| 本文献已被 CNKI 等数据库收录！ |
| 点击此处可从《排灌机械工程学报》浏览原始摘要信息 |
| 点击此处可从《排灌机械工程学报》下载免费的PDF全文 |
|
