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首页> 外文期刊>JSME International Journal. Series B, Fluids and Thermal Engineering >Three-Dimensional Structure of Turbulent Flow in Mixing T-Junction
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Three-Dimensional Structure of Turbulent Flow in Mixing T-Junction

机译：混合T型结中湍流的三维结构

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摘要

Experimental results on the turbulent mixing of hot and cold airflows in a T-junction are reported, which simulates the HVAC unit used in an automobile air conditioning system. Experiments are conducted keeping Reynolds number and temperature of the main flow at 2.5 x 10~4 and 12℃, respectively, and the velocity of the branch flow (60℃) is changed for three velocity ratios of 0.5, 1 and 2. The flow 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 three-dimensional structure. In spite of such a complex flow field, the mean temperature in the thermal mixing layer shows quite uniform distributions in the spanwise direction, and the strong turbulence produced around the separation bubble does not work effectively to the thermal mixing of hot and cold airflows.
机译：报道了在T型接头处冷热气流的湍流混合的实验结果，该结果模拟了汽车空调系统中使用的HVAC单元。进行实验，将主流的雷诺数和温度分别保持在2.5 x 10〜4和12℃，并且在三种速度比0.5、1和2下改变支流的速度（60℃）。在T型结的边缘处，从分支处分离出的气泡形成大的分离气泡。在该分离泡周围形成纵向涡旋，因此流场具有三维结构。尽管存在如此复杂的流场，但热混合层中的平均温度在翼展方向上显示出相当均匀的分布，并且在分离气泡周围产生的强烈湍流无法有效地对热气流和冷气流进行热混合。

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