Drag Reduction by Micron-Sized Distributed Surface Geometry on a Flat Plate.
Drag Reduction by Micron-Sized Distributed Surface Geometry on a Flat Plate.
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通过微米级分布式表面几何形状在平板上减少阻力。
DOI：
10.1299/kikaib.62.1754
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
Y. Kohama
中科院分区：
文献类型：
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作者：
Emi Oguri;Y. Kohama
本文论述了实验研究，使用微米级分布的表面几何形状的平板上，以观察有效的减阻。也就是说，目的是验证Tani的假设，即分布粗糙表面甚至可以减少湍流阻力在一定的雷诺数范围内。因此，我们直接测量了具有微尺寸分布粗糙表面几何形状的薄板包裹平板的净阻力。获得的数据表明，在某些类型的表面几何形状的情况下，观察到的减阻量有限。这一结果需要一个新的解释如何抑制湍流能量在湍流边界层，因为现有的湍流减阻机制的脊表面总是解释与流向槽结构。因此，通过对所得结果的分析，可以找到更合适的湍流边界层能量产生机制。本实验是围绕上述问题进行的一系列研究的第一步。
The present paper deals with experimental investigation using micron-sized distributed surface geometry on a flat plate in order to observe effective drag reduction. Namely, the objective is to verify Tani's hypothesis that distributed rough surface can even reduce turbulent drag in a certain Reynolds number range. So, we directly measured the net drag of a flat plate wrapped by a sheet with micro-sized distributed rough surface geometry. Obtained data showed that a limited amount of drag reduction is observed in the case of certain kinds of surface geometries. This result requires a new explanation of how the turbulent energy is suppressed in the turbulent boundary layer, since existing turbulent drag reduction mechanisms for a riblet surface is always explained together with streamwise groove structure. Therefore, by analyzing the obtained results, a more appropriate energy production mechanism in the turbulent boundary layer might be found out. The present experiment is the first step in a series of investigations concerning the above title.