层板冷却结构传热优化数值模拟研究  

Numerical Investigation on Optimizing Heat Transfer in Lamilloy

作　　者：全栋梁[1] 刘松龄[1] 李江海[1] 

机构地区：[1]西北工业大学动力与能源学院,陕西西安710072

出　　处：《西北工业大学学报》2004年第6期816-820,共5页Journal of Northwestern Polytechnical University

基　　金：西北工业大学博士论文创新基金 (CX2 0 0 315 );国家"973"基金 (JC2 0 0 0 0 5 0 5 0 0 5 0 1)资助

摘　　要：为研究层板强化换热机理 ,提高其内部换热效率以优化层板传热设计 ,在相同的两侧换热条件和冷气密流下 ,对孔径、通道高度和开孔率相同 ,但内部绕流形式不同的 5种层板结构和 1种双层壁结构进行了流固耦合传热计算 ,得到了其综合冷却效率 ,结果表明层板结构的综合冷却效率明显高于双层壁 ;冷气沿程吸热焓增带走了大部分从燃气侧进入层板的热 ,并且冷气与层板内表面的换热主要发生在出气板上 ;绕流柱的存在增加了换热面积 ,一定程度上增强了换热 ;Lamilloy turbine blades, efficient for air cooling, have appeared already in experimental advanced aeroengines. Lamilloy research attracts increasingly the attention of aeronautical power plant engineers at home and abroad. Since 1998, we have engaged in experimental and numerical simulation research on Lamilloy to improve its cooling effectiveness. In this paper, in order to learn how the internal flow patterns affect the overall cooling effectiveness of Lamilloy, conjugate numerical simulation was carried out for a double wall without pin fin and five Lamilloy cooling configurations; conjugate numerical simulation was carried out by using a commercial software, FLUENT 6.1. The calculated Lamilloy configurations have the same hole diameters, spacings and pin fin heights. RNG-kandepsi; turbulence model and enhanced near-wall treatment were used in simulation. The numerical results show that Lamilloy has higher cooling effectiveness than the double wall cooling. Most of the heat, transferred from hot gas to the Lamilloy, was taken off by the coolant through the walls, and the heat transfer on internal surface of outlet plate was the major mechanism for removing the heat. Our finding that Lamilloy has higher cooling effectiveness than the double wall cooling without pin fin may be explained by the reasoning that the existence of pin fin increases heat transfer area and the amount of heat transfer in Lamilloy. Thus the uniformity of temperature in Lamilloy can be improved by proper design of pin fin.

关 键 词：层板 冷却效率 数值模拟 

分 类 号：V233.5[航空宇航科学与技术—航空宇航推进理论与工程]