Relaxation of the Turbulent Boundary Layer After an Abrupt Change From Rough to Smooth Wall (Data Bank Contribution)
Relaxation of the Turbulent Boundary Layer After an Abrupt Change From Rough to Smooth Wall (Data Bank Contribution)
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从粗糙壁突变到光滑壁后湍流边界层的松弛（数据库贡献）
DOI：
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发表时间：
1993
期刊：
影响因子：
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通讯作者：
H. Coleman
中科院分区：
文献类型：
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作者：
R. Taylor;J. Taylor;M. Hosni;H. Coleman
本文测量了表面粗糙度阶跃变化的平板湍流边界层的速度、湍流强度和表面摩擦系数。测试表面的第一个0.9 m长度用1.27 mm直径的半球粗糙化，所述半球以均匀交错阵列间隔开2个基部直径，并且剩余的1.5 m长度是光滑的。的配置文件与以前的数据进行比较，所有粗糙的情况下密切匹配的条件下，在同一设施。的表面摩擦力的数据进行了比较与以前的数据为所有粗糙和所有光滑的情况下。
Measurements of velocity and turbulence intensity profiles and skin friction coefficient are presented for turbulent flat-plate boundary layer flow over a test surface with a rough-to-smooth step change in surface roughness. The first 0.9 m length of the test surface is roughened with 1.27 mm diameter hemispheres spaced 2 base diameters apart in a uniform staggered array, and the remaining 1.5 m length is smooth. The profiles are compared with previous data for all-rough cases under closely matched conditions in the same facility. The skin friction data are compared with previous data for both all-rough and all-smooth cases.