広がり流れにおける乱流境界層 : 第3報壁面近くの総合速度分布について

概要

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Measurements of skin frictions and velocity profiles in turbulent boundary layers with adverse pressure gradients are presented. The skin friction was measured by a surface Pitot tube of the stanton type which was calibrated under various pressure gradients. It is said that all velocity distributions near the wall expressed in the universal form u/u^* vs. u^*y/ν are almost the same irrespective of pressure gradient. Our experiments showed that this relationship holds up to a short distance before the separation point. However, near the separation point (H>1.7) the value of coefficient a_1 in the universal velocity distribution u/u^*=a_1+a_2log_<10> (u^*y/ν) diminished as shown in Fig.12 and the measured values of skin friction were greater than that predicted by the equation of Ludwieg and Tillmann.
一般社団法人日本機械学会の論文
1955-08-25