| 平板湍流摩阻系数的显式表达式 |
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| 引用本文： | 是长春. 平板湍流摩阻系数的显式表达式[J]. 航空学报, 1988, 9(6): 299-302 |
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| 作者姓名： | 是长春 |
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| 作者单位： | 北京大学 |
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| 摘 要： | 湍流摩阻系数的计算是工程技术中经常遇到的问题。计算时所依据的公式多为半经验半理论的结果,如Karman公式,Van Driest公式和Prandtl公式等。这些公式是以隐函数给出的,给计算带来不便。但是不难发现,这类公式经过适当的变换,可以化为统一形式的超越代数方程,这种方程没有有限形式的解析解,本文给出了一种近似解析解。根据这种方法除了导出上述公式的显式表达式外,还对White公式作了修正。当然解超越代数方程最根本的方法是迭代法,本文对此也作了简单讨论。
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| 关 键 词： | |
| 收稿时间： | 1987-09-12; |
AN EXPLICIT EXPRESSION OF THE TURBULENT FRICTIONAL DRAG COEFFICIENT FOR A FLAT PLATE |
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| Shi Changchun. AN EXPLICIT EXPRESSION OF THE TURBULENT FRICTIONAL DRAG COEFFICIENT FOR A FLAT PLATE[J]. Acta Aeronautica et Astronautica Sinica, 1988, 9(6): 299-302 |
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| Authors: | Shi Changchun |
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| Affiliation: | Beijing University |
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| Abstract: | This paper presents some analytic expressions associated with those well-known skin-friction formulas for turbulent shear flows. Two methods were developed for this aim. The first one is an approximated analytic solution for the same super-algebraic equation; And the second one is a method of iteration and its convergence has been proven. The skin-friction formula of D.B.Spalding has also been improved in the present work. |
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| Keywords: | turbulence boundary layer friction drag approximate calculation. |
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