J0550403 Promotion and control of turbulent mixing of hot and cold airflows in T-junction

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  • J0550403 T形合流管における高・低温空気流の乱流混合促進

Abstract

Experimental and numerical studies were made on the effect of a delta-wing row on the promotion of turbulent mixing of hot and cold airflows in a T-junction with rectangular cross sections. The wing row was attached on the upstream wall of the branch. The influence of the angle of attack of the wings on the distributions of mean temperatures and turbulence intensities was examined by experiments, and the experimental results were compared with numerical ones obtained by LES with a commercial code. The thermal mixing was promoted by strong turbulence produced by the delta wings with the backward tilting arrangement, and the degree of mixing could be changed with the angle of attack. The mean temperature distributions predicted by LES agreed qualitatively with those obtained by experiments, but the turbulence intensities were generally overestimated in downstream regions.

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