燃气轮机透平叶片旋转内部冷却通道研究现状与发展趋势

Research Status and Development Trend of Rotating Internal Cooling Channel in Gas Turbine Blade

【目的】透平叶片高效内部冷却技术对提高燃气轮机热效率至关重要,高温透平动叶作为燃气轮机的重要部件,对其冷却性能的把握显得尤为重要。由于科里奥利力(科氏力)、浮升力和通道结构对高温透平动叶内部通道冷却性能影响显著,因此,基于这些影响,总结归纳高温透平动叶内部冷却通道的研究现状与发展趋势。【方法】介绍了旋转内部冷却通道的新型结构设计,提出了一种适用于双层壁叶片构型的新型旋转内部冷却通道结构。【结论】双侧强化U形通道可以利用科氏力的强化换热作用,导致其冷却性能优于传统旋转U形通道,燃机透平动叶内部冷却有着广阔的提升空间。

[Objectives]The high-efficiency internal cooling technology of turbine blade is crucial for improving the thermal efficiency of gas turbine.As an important component of the gas turbine,it is essential to conduct research on the cooling performance of rotor blade.Due to significant effect of Coriolis force,buoyancy force,and channel structure on the cooling performance of rotating internal channel of turbine blade,this paper summarized the research status and development trends of rotating internal cooling channel based on these effect factors.[Methods]A new structural design of rotating internal cooling channels was introduced,and a new rotating internal cooling channel structure suitable for double-walled blade configurations was proposed.[Conclusions]Double-sided enhanced U-shaped channels can utilize the enhanced heat transfer effect of Coriolis force,resulting in better cooling performance than traditional rotating U-shaped channels.There is a broad room for improvement in the internal cooling of gas turbine rotor blades.