| 矩形明槽宽深比和边壁糙率对于流速分布和阻力影响的实验研究 |
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| 引用本文： | 惠遇甲,胡春宏.矩形明槽宽深比和边壁糙率对于流速分布和阻力影响的实验研究[J].水科学进展,1991,2(1):22-31. |
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| 作者姓名： | 惠遇甲 胡春宏 |
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| 作者单位： | 清华大学水利系 |
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| 摘 要： | 本文通过矩形水槽试验,改变宽深比和边壁糙率,系统地研究了明渠恒定均匀流水力学特性.试验表明,根据断面上各条垂线流速分布的特征,可将断面划分为对数流速分布区和抛物线流速分布区.文中给出了两区流速分布的表达式以及两区分界线和垂线最大流速点位置随宽深比和边壁糙率而变化的规律.本文还分析了光滑明渠流和粗糙明渠流阻力系数的变化、阻力系数的分割以及剪切应力沿床面和边壁的分布规律.
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| 关 键 词： | 矩形 明槽 流速 阻力 恒定流 |
| 收稿时间： | 1990-05-26 |
Effects of Aspect Ratio and Sidewall Roughness on VeSocity Distribution and Resistance Coefficient in Rectangular Open Channels |
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| Hui Yujia,Hu Ghunhong.Effects of Aspect Ratio and Sidewall Roughness on VeSocity Distribution and Resistance Coefficient in Rectangular Open Channels[J].Advances in Water Science,1991,2(1):22-31. |
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| Authors: | Hui Yujia Hu Ghunhong |
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| Affiliation: | Tsinghua University |
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| Abstract: | A series of experiments were conducted in a rectangular flume by varying aspect ratio and sidewall roughness. The vertical velocity distributions over cross sections are analysed systematically. It is demonstrated that each velocity profile can be divided into a logarithmic velocity region in the lower part and a parabolic vciocity region in the upper part, according to its characteristics. The expressions of velocity distribution and the dividing line between the tworegions, as well as the variations of the location of maximum velocity, with respect to aspect ratio and sidewall roughness, are given herein. Moreover, the variation of resistance coefficients for smooth and rough open-channel flows, the separation of bed and sidewall resistance coefficients, and the distributions of bed and sidewall shear stresses, are also discussed. |
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