エッジトーン現象によって噴流中に形成された組織構造の特徴 : 第4報,エッジトーン現象のパッシブ制御が平均速度場や乱れ場におよぼす影響(流体工学,流体機械)

概要

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Present study revealed that the mean and the turbulent characteristics of the flow fields where edge tone phenomenon is suppressed by the interaction of square bars approach two dimensional jet. It was also revealed that the suppression of production terms is the main cause of the phenomenon that out of the turbulent characteristics, streamwise turbulent intensity <u_1^2>^^^- and Reynolds stress -<u_1u_2>^^^- decrease and approach to the value of the two dimensional jet. On the other hand, the results of non-isotropy tensor of velocity b_<12> and the production term of <u_2^2>^^^- component imply that the decrease in vertical turbulent intensity <u_2^2>^^^- is caused by the suppression of redistribution term, more specifically, the energy transfer from <u_1^2>^^^- to <u_2^2>^^^-. Besides, the comparison result of the phase-averaged non-isotropy tensor of velocity <b_<12>> and the vortical structures induced by edge tone phenomenon implies that the energy transfer from <u_1^2>^^^- to <u_2^2>^^^- is generated at the positive pressure regions, and the control of the vortical structures suppresses the energy transfer from <u_1^2>^^^- to <u_2^2>^^^-.
社団法人日本機械学会の論文
2009-07-25