高レイノルズ数乱流混合層の大規模構造 : 第1報,大規模構造の瞬間的特性と位相平均特性

概要

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In the present paper, coherent structures of the turbulent mixing layer are investigated by means of a hot-wire rake technique. Reynolds number based on the vorticity thickness is 34 000. The u and v velocity components of the mixing layer were measured by the rake of 12X wires crossing the layer. Time-averaged turbulent statistics show the self-similar features of the turbulent mixing layer. The large-scale motions are found in the quasi-instantaneous structures viewed in a reference frame of the convective velocity. To study the large-scale structures in detail, a diagnostic that classifies the rollers and braids is employed. The diagnostic reveals that the instantaneous large-scale structure consists of roller dominance regions and/or strain dominance regions. Furthermore, phase-averaged turbulent statistics of the large-scale motion show that Reynolds stresses of high intensity are generated by the large-scale motion of strain dominance properties.
社団法人日本機械学会の論文
1995-08-25