燃烧室新型迷宫复合冷却结构的壁温计算

Computation of Wall Temperature of a Combustor′s Maze Composite Cooling Structure

燃烧室迷宫复合冷却结构是一种集冲击、对流换热和近似发散冷却于一身,结构合理,冷却效率高,具有创新性的新型冷却结构。在对其气膜冷却结构进行换热机理分析研究的基础上,建立了计算模型,获得了其沿程参数及多层壁温的分布规律。计算结果表明,该冷却结构可节省冷却空气量25%左右,并且能大大降低壁温梯度。因此,该冷却结构能较大地提高燃烧室的冷却效率,提高发动机性能,延长燃烧室的使用寿命。

A combustor＇s maze composite cooling structure is an innovative and highly efficient cooling structure that integrates impingement, convection heat exchange and approximate perspection cooling. On the basis of the analysis of heat exchange mechanisms of its film cooling structure, a computation model was established, and the parameters along the wall and the mutil-layer wall temperature distribution law were obtained. The computation results show that the cooling structure can save about a quarter of cooling air volume, thus gready lowering down the wall temperature gradient, enhancing the cooling efficiency of the combustor and the performance of an engine and extending the life-span of the combustor.