曲面に沿う円形乱流噴流に関する実験的研究 : 第2報,間欠領域の諸特性

概要

論文の詳細を見る
Turbulent jets discharged from a circular nozzle along both a convex wall and a flat plate are measured in order to reveal a streamwise curvature effect on the structure of a three-dimensional wall jet. In our previous paper^<(1)>, we reported differences between these two flows in the wall static pressure, the turbulence intensities, the Reynolds stresses and the mean streamwise vorticity. The present paper describes characteristics in the intermittent region, such as intermittency, skewness and flatness factors, as well as the volume flux. Distributions of all these quantities suggest that there is substantial difference between turbulence structures in the vertical and spanwise directions. Comparing with a flat plate case, some typical features of the wall jet along a convex wall are disclosed. (1) Both the center and width of the intermittent region become smaller in the vertical direction when these are normalized by the local half-width. (2) The skewness and flatness factors of streamwise velocity fluctuations are greater in the outer part of the intermittent region. (3) The entrainment becomes quite considerable in the central portion of the flow; this leads to the increase of the total volume flux.
一般社団法人日本機械学会の論文
1988-10-25