【作者】 谢浩；

【导师】 张靖周；

【作者基本信息】 南京航空航天大学 ， 热能工程， 2005， 硕士

【摘要】 运用数值计算的方法分别对阵列射流冲击冷却、多斜孔气膜冷却以及冲击-发散复合冷却方式的流动与传热特性进行了三维数值研究。总结了主要的结构参数和状态参数对流动与传热特性的影响规律。首先通过对射流冲击冷却方式的研究,分析了相邻孔间距、冲击间距以及射流入口雷诺数对冲击靶面换热系数的影响情况,然后对多斜孔冷却方式进行了数值模拟,重点探讨了吹风比和相邻孔间距对绝热温比与壁面换热系数的影响规律,最后,针对冲击-发散复合冷却流场的计算物理模型,研究吹风比、相邻孔间距的变化对冲击-发散复合冷却流动与传热特性的影响。计算结果为模型结构优化提供了理论依据。本文旨在对冲击-发散复合冷却技术开展机理和基础性研究,研究成果可应用于更高推重比级发动机预研。更多还原

【Abstract】 A numerical study is reported to investigate the flow and temperature fields for jet array impingement cooling, inclined multi-hole film cooling and impingement/effusion film cooling. The effects of the flow and the geometric parameters on the flow and heat transfer characteristic are analyzed extensively.Firstly, for jet array impingement cooling, the effects of the distance of adjacent holes, the impinging distance and jet Reynolds number on heat transfer characteristic at the target wall are summarized under staggered holes arrangement and the same hole diameter. And then, the numerical simulation of inclined multi-hole film cooling has been studied. The influence factors examined in this case include blowing ratio and the distance of adjacent holes. Finally, the paper gives the numerical simulation of impingement/effusion film cooling. The numerical simulations are conducted for different blowing ratios and different distances of adjacent holes. The cooling configuration is optimized on the basis of the results.The purpose of this paper is to make extensive study on the essence of impingement/ effusion film cooling, and the research results will be applied in futural study on the higher performance aeroengine.更多还原