| 漫滩水流摩阻因子与涡粘性系数的研究 |
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| 引用本文： | 许唯临,D.W.Knight,唐小南.漫滩水流摩阻因子与涡粘性系数的研究[J].水科学进展,2004,15(6):723-727. |
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| 作者姓名： | 许唯临 D.W.Knight 唐小南 |
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| 作者单位： | 1.四川大学高速水力学国家重点实验室, 四川, 成都, 610065; |
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| 摘 要： | 对复式河道漫滩水流进行了研究,建立了摩阻因子与一维明渠流摩阻因子的关系,揭示出滩地的量纲为一涡粘性系数随着摩阻因子的增加而增加,并将二次流的影响表达成与雷诺切应力相同的形式,从而将其归入表观切应力中,由量纲为一表观涡粘性系数确定,后者可通过量纲为一表观涡粘性系数与摩阻因子之间的一个关系加以计算,该关系类似于量纲为一涡粘性系数与摩阻因子之间的关系。对光滑边界上对称的漫滩水流进行了计算,计算结果与实验资料吻合良好。
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| 关 键 词： | 漫滩水流 流速 切应力 摩阻因子 涡粘性系数 |
| 文章编号： | 1001-6791(2004)06-0723-05 |
| 收稿时间： | 2003-07-01 |
| 修稿时间： | 2003年7月1日 |
Study on friction factor and eddy viscosity of overbank flows |
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| XU Wei-lin,D. W. Knight,TANG Xiao-nan,Chengdu ,China, .School of Civil Engineering,The University of Birmingham,U K.Study on friction factor and eddy viscosity of overbank flows[J].Advances in Water Science,2004,15(6):723-727. |
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| Authors: | XU Wei-lin D W Knight TANG Xiao-nan Chengdu China School of Civil Engineering The University of Birmingham U K |
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| Affiliation: | 1.State Key Lab of Hydraulics on High Sp eed Flows, Sichuan University, Chengdu 610065, China;2.School of Civil Engineering, The University of Birmingham, U K |
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| Abstract: | The overbank flow in a compound channel is studied. And the relationship between the friction factor and one dimensional in-bank flow friction factor is established. The dimensionless eddy viscosity is found increasing with the growing friction factor on flood plains. The effect of secondary flow is expressed in the same form as the Reynolds shear stress so that they can be combined into the apparent shear stress and determined through the dimensionless apparent eddy viscosity, which can be calculated by the relationship of the dimensionless apparent eddy viscosity and the friction factor similar to that of the dimensionless eddy viscosity and the friction factor. The symmetric overbank flows with smooth boundary are computed and the results agree with the experimental data. |
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| Keywords: | overbank flow velocity shear stress friction factor eddy viscosity |
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