C144 T形合流管における流動特性と高・低温空気流の乱流混合(C-14 乱流熱物質移動および反応流(2),一般講演)

概要

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An experimental study was conducted on turbulent flow and thermal mixing in rectangular channels with a T-junction, which simulate the HVAC (Heating, Ventilating, Air-Conditioning) unit used for an automobile air-conditioning system. Experiments were conducted keeping Reynolds number and temperature of the main-channel flow at 2.5×10^4 and 10℃, respectively, and the velocity ratio of the branching-channel flow (65℃) to main one was changed from 0.5 to 2.0. The velocity field was measured by PIV, and the mean temperature distribution in the mixing region was measured by the thermocouple rake. It was found that the flow entering the main channel from branching one is separated at the edge of the T-junction: the separation bubble has a canopy-like shape and longitudinal vortices are formed inside it. In spite of such a complex three-dimensional flow structure, the thermal mixing layer shows a rather uniform distribution in the spanwise direction of the main channel. Neither the strong turbulence produced around the separation bubble nor the longitudinal vortex formed in the separation bubble contribute so much to the thermal mixing of hot and cold air.
日本流体力学会の論文
2004-08-09