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通过CFD计算流体软件FLUENT,分别对支管无附加结构及支管有附加结构直管、渐扩管、减缩管四种结构的T型管内冷热流体混合过程进行了大涡模拟,获得了管道内部的瞬时温度。将各结构温度云图与速度矢量图、无量纲时均温度及无量纲均方根温度进行了对比。数值结果表明,附加结构的添加使管内流体流型由冲击射流变为偏转射流,显著减小了T型管壁上的温度波动;缩管结构的无量纲均方根值比其他附加结构更小,表明缩管结构更适合用以减小管壁的温度波动。
Through CFD computational fluid software FLUENT, large-eddy simulation was carried out on the mixing process of hot and cold fluid in T-tube with no additional structure of branch pipe and branch pipe with additional structure of straight pipe, divergent pipe and reduction pipe. The internal Instantaneous temperature. The structure of temperature and velocity vector maps, dimensionless time-averaged temperature and dimensionless root mean square temperature were compared. The numerical results show that the addition of additional structure makes the fluid flow in the tube change from impinging jet to deflecting jet, and the temperature fluctuation on the T-shaped tube wall is significantly reduced. The dimensionless root mean square of the tube shrinking structure is smaller than other additional structures , Indicating that the shrink tube structure is more suitable to reduce the temperature fluctuation of the tube wall.