軸流中の細長回転円筒上の乱流境界層の実験 : 第3報, 変動成分エネルギーの収支とクロススペクトル

概要

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This study is concerned with the turbulent structure of three-dimensional boundary layer on a thin cylinder rotating in a uniform stream. A ratio of the turbulent shear-stress to the turbulent intensity, that is, a structure parameter, is significantly larger than the turbulent boundary layer on a stationary cylinder which has nearly the same value as in two-dimensional turbulent boundary layer. Terms appearing in the equations for the turbulent energy of each component of fluctuating velocities are estimated, and their roles in the energy budgets in this boundary layer are clarified. Particularly, the importance of redistribution terms and exchange terms between v-and w-energy is reconfirmed. Cross-spectra between u-and w-fluctuating velocities are examined across the boundary layer. The distribution of co-spectra and quad-spectra (i.e., the real and imaginary parts of the cross-spectra respectively) shows the existence of large-scale organized structure in this turbulent boundary layer.
一般社団法人日本機械学会の論文
1998-10-25