自動車用HVACにおける高・低温空気流の乱流混合に関する研究 : T字形合流管における熱流動特性(熱工学,内燃機関,動力など)

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In this paper, experimental results are reported on turbulent mixing of hot and cold airflows in a T-junction, which models the HVAC unit used in an automobile air conditioning system. Experiments were conducted keeping Reynolds number and temperature of the main flow at 2.5×10^4 and 12℃, respectively, and the velocity of the branch flow (60℃) was changed for three velocity ratios of 0.5, 1, and 2. The influence of the channel aspect ratio on the flow characteristics was also investigated. The flow entering the main channel from the branch is separated at the edge of the T-junction and forms a large separation bubble. Longitudinal vortices are formed around this separation bubble, thus the flow field has a complex three-dimensional structure. In spite of such a complex flow field, the mean temperature of the airflow in the mixing layer shows quite uniform distributions in the spanwise direction of the channel. It was also found that the strong turbulence produced around the separation bubble does not work effectively to the thermal mixing of hot and cold airflows.
社団法人日本機械学会の論文
2005-12-25