軸対称異方性乱流場の実験的解析 : 第1報,葉巻型軸対称乱流場の発生とその減衰過程

概要

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A homogeneous anisotropic turbulence field was realized without distortion of the mean flow by installing a honeycomb into a nearly isotropic strong turbulence. The resultant turbulence showed strong cigar-shaped axisymmetry, in which the longitudinal component of the turbulent fluctuation had a far larger intensity than the other two components. It gradually recovered isotropy in the course of its streamwise decay. Its decay rate was smaller than that of the strong quasi-isotropic turbulence. The intensity of the longitudinal component decreased slowly downstream. On the other hand, the intensities of the lateral components increased in the first stage of their decay and thereafter began to decrease. The features of the decay process of the axisymmetric turbulence were closely related to the degree of isotropy, the energy level of each component and the wave-number range in the spectrum.
社団法人日本機械学会の論文
1988-09-25