主流乱れの円柱背面熱伝達への影響 : 主流乱れが低周波の場合

概要

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The effects of low frequency components of free-stream turbulence on heat transfer in the separated region of a cylinder were experimentally investigated for a Reynolds number range from 7.0×10^3 to 2.4×10^4 at the free-stream turbulence intensities of T_u < 0.5%. The experiments were carried out under constant heat flux conditions and two kinds of low frequency components of free-stream turbulence. The shape of separated shear layer, power spectrum of fluctuating velocity in the shear layer and pressure distribution around a cylinder were also measured. It is found that heat transfer in separated flow depends upon the diffusion of the separated shear layer. When the separated shear layer is thick and the effect of diffusion is large (Pattern Ap), heat transfer rate increases and vice versa ( Pattern Bp). "Transition" from Pattern Bp to Pattern Ap depends upon low frequency components of free-stream turbulence.
社団法人日本機械学会の論文
1985-10-25