4象限分類法による底吹き気液二相噴流の乱流構造に関する研究

概要

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Conditional sampling measurements based on the 4-quadrant classification method were made to reveal the turbulence structure of a round water jet and a round gas-liquid two-phase jet moving in the vertical direction using a two-dimensional LDV. In the central part of the jets, the rms values of the vertical and radial turbulence components and the Reynolds shear stress of the two-phase jet are much greater than those of the water jet. This difference is attributable to the wake of bubbles rising upward. The difference becomes very small at the outer edge of the jets. Turbulent motions were classified into four distinct categories : ejection, sweep, outward interaction, and inward inter-action. The contribution of each motion to the Reynolds shear stress and turbulence kinetic energy were determined. Turbulence production was much greater in the two-phase jet than in the water jet. Ejection and sweep were found to be mainly responsible for turbulence production in both kinds of jets.
社団法人日本機械学会の論文
1994-04-25