方腔斜进风对流换热分叉现象的数值研究

数值模拟了二维方腔两顶角狭缝集中斜进风、两底角狭缝集中出风通风方式下的流动与换热。研究表明 :即使是具有对称结构的开口系统 ,其稳定的流型也可能是不对称的 ;斜进风通风方式在进风角度小于一定值时流动存在静态分叉 ,即随计算初场的不同会得到不同的解 ;这种不对称的流动仍具有较好的流场、温度场分布均匀性以及较高的换热能力 ;在工程上对斜进风进行研究时 ,必须用全场分析的方法 ;数值计算结果与可视化实验的结果得到了较好吻合。该研究为空间站舱内的通风换热系统的设计与选择及其工程应用提供一定的依据

Numerical study of bifurcation of convective heat transfer in a square cavity with oblique inlets

The air flow and heat transfer in a 2 D square cavity with oblique slot inlets in the top corners and horizontal slot outlets in the bottom corners are analyzed numerically. The emphasis is placed on the bifurcation phenomenon of the airflow and the related heat transfer. The results show that the flow pattern is asymmetric for this structurally symmetrical system when the inlet angle is less than a critical value. This results are validated by flow visualization. The heat transfer capacity of this kind of ventilation system is acceptable. It is suggested that the system should be studied in its integrity instead of using half of its structure for a meaningful engineering application.