T型三通管内热分层流动3D数值模拟

针对主管和支管流体温度不同的等径三通管，利用AQUA程序，对该三通管内的热分层流动进行了三维数值流场模拟。模拟结果显示，高流速的支管流体自上部射入，深入到主管的主流内部，迫使主管内上游来流贴着主管下壁面流动。在支管人流的背流面有一涡存在，主支流在此涡下部的狭窄通道内被加速到较支流速度更高的速度。对三通管内的温度分布计算表明，支流人流的迎流面存在着很大的温度梯度，两种流体的混合主要存在于远离支流人流的下游地区。

3-D Numerical Simulation of Stripping and Stratification in Mixing T-Junction

3-D numerical simulation on flow regime has been performed for the equal diameter T-junction with different inlet temperatures for primary and branch pipes by AQUA code to study the swipping and stratification phenomenon. The results show that the inlet branch flow vertically sticks into the primary pipe and only a very narrow channel at the downside of primary pipe is left for the primary flow to pass through. A vortex existing just after this vertical branch flow at the upper side of the primary pipe greatly shrinks the flow area both for the primary flow and the branch flow, thus they are accelerated in this narrow channel. Temperature distribution has been investigated too. The temperature gradient indicates that the mixing at the upwind of the branch jet is fierce, but the mixing mainly happens at the downstream of the primary pipe.