稀疏型气膜出流内部冷气侧换热特性实验研究

目前航空发动机涡轮叶片的弦中区大多采用稀疏型(相对叶片前缘)气膜冷却技术。实验研究了这种复合冷却方式中带有冲击射流和没有冲击射流两种情况下的稀疏型气膜出流内部冷气侧换热特性,通过对大量的实验数据分析,得出了诸多流动及几何参数对叶片内表面换热特性的影响,并在实验参数范围内整理出了换热准则关系式。其分析结果及相应准则关系式对叶片的结构设计具有直接的指导意义。

The Interior Heat Transfer Characteristics of Gas Turbine Blade Due to Sparse Film Cooling Holes

The film cooling technique is one of the useful cooling methods.At present,the sparse film cooling technique is alaiays employed for the midchord region of gas turbine blade in aeroengine,and the impingement cooling technique is also used at the same time.So the interior heat transfer characteristics about an inner side of blade due to sparse film cooling holes have become a very complicated and interesting problem.In this paper,the heat transfer characteristics have been investigated experimentally whether there is impingement cooling fluid or not.Through lots of experimental data,the effect of flow parameters and geometric parameters on heat transfer characteristics has been studied.Besides that,the correlation equation for the interior heat transfer characteristics to the parameters is finally formulated,and the comparison shows that the correlation results are in good agreement with the experimental data.