自己保存条件下の平面壁面噴流の乱流構造に及ぼす速度比の影響 : 第1報, 自己保存の条件と平均速度場

概要

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Measurements of the plane wall jet under the self-preserving pressure gradient were made to investigate the effect of the ratio of the maximum velocity to the free stream velocity on the time mean properties. In the present experiments the value of U_m/U_e was set at three cases over the range of 2.0 to 4.0. Mean velocity and the local skin friction coefficient have been measured with the pitot tube and preston tube, respectively. The mean flow is closely self-preserving in the range of 57<x/S_1<162. However, the similar velocity profiles for each case may differ from one another depending on the difference of the velocity ratio. The value of the constants in the log law is found not to be similar to those in the boundary layer. The inner layer thickness increases with decreasing velocity ratio; conversely the half-width decreases. The skin friction coefficient is not in agreement with the formula adopted by previous investigators.
一般社団法人日本機械学会の論文
1991-11-25