Direct total skin-friction measurement of a flat plate in zero-pressure-gradient boundary layers
Direct total skin-friction measurement of a flat plate in zero-pressure-gradient boundary layers
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DOI：
10.1088/0169-5983/41/2/021406
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发表时间：
2009-03
影响因子：
1.5
通讯作者：
K. Mori;Hiroki Imanishi;Y. Tsuji;Tomohiro Hattori;M. Matsubara;S. Mochizuki;Masaru Inada;Tadashi Kasiwagi
中科院分区：
文献类型：
--
作者：
K. Mori;Hiroki Imanishi;Y. Tsuji;Tomohiro Hattori;M. Matsubara;S. Mochizuki;Masaru Inada;Tadashi Kasiwagi
平板上的总表面摩擦是用拖曳水箱直接测量的，最大雷诺数为REL≃107(或Rθ≃104)。在静水中拖曳3.3米和4.3米长的板，用小型浮力装置平衡垂直重量，并用高灵敏度的称重传感器测量它们的阻力。我们开发了一种在湍流模拟器上修正兴波阻力、压力阻力和阻力的新技术。当测量的总阻力换算为局部阻力时，发现局部摩擦阻力比Kármán-Schoenherr公式所给出的阻力小约6%。但与浮点法、油膜干涉法和渐近估计法得到的结果一致。
The total skin friction on a flat plate is directly measured by using a towing tank up to Reynolds number ReL ≃ 107 (or Rθ ≃ 104). Plates of 3.3 and 4.3 m in length are towed in still water, balancing the vertical weight by small flotation devices, and their drag force is measured by a highly sensitive load cell. We have developed a new technique to correct wave-making resistance, pressure resistance and drag on a turbulence simulator. When the measured total drag is converted into local drag, it is found that the local frictional resistance is about 6% smaller than that given by the Kármán–Schoenherr formula. But it is consistent with the values obtained by the floating element technique, oil film interferometry and asymptotic evaluations.