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均等な凹凸面に沿う乱流境界層のせん断力について

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  • ON THE SHEAR FLOWS ALONG FLAT PLATES WITH UNIFORMLY DISTRIBUTED SURFACE ROUGHNESS

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Profiles of mean wind speeds and distributions of Reynols stresses over the cylindrical rough-ness elements were obtained in a naturally developed boundary layer on the smooth floor of awind tunnel. When the standard deviation of roughness height over the total plane area, hrms andthe ratio of the element plane area to the total plane area, a were taken as the parameters of theroughness configuration, the stronger shear flow were observed below a=10% under the samevalues of hrms. The roughness above a=15% higher than hrms=7 mm caused zero level dis-placement which was little efficient to increase frictional stress for the increment of height. By thespectral analysis of wind speed fluctuations it was founed that the turbulence scale relating to theshear stress was about 30 times of hrms.

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