涡轮叶片转弯流道换热分析与优化设计

对涡轮叶片冷却通道换热问题进行了研究,提出了新的结构设计方案,改善了叶片性能。采用流-热耦合分析方法对典型三腔回流式冷却叶片气动及传热性能进行了分析,得到叶片压力与温度分析结果,发现叶片最高温度出现在叶尖尾缘位置。对此提出了冷却通道两种新的结构方案,在不降低叶片气动性能的前提下,分别可降低叶片的最高温度和平均温度。通过分析发现,将两种结构特征进行组合,可同时较大幅度地降低叶片最高温度和平均温度,并对新型组合冷却通道进行了优化设计,与原结构相比叶片综合性能得到了较大提高。

Thermal analysis and design optimization for cooling passage of turbine blades

Numerical studies of turbine blade cooling pasasge heat transfer were presented and new structure was proposed to improve the blade performance.Coupled aero-thermal analysis methods were used for flow and heart transfer analysis.The distribution of blade static pressure and temperature were obtained.The results demonstrate that the maximum temperature appears at the tip of blade trailing edge.So two new cooling passage designs were proposed,in which blade maximum temperature and volume-average temperature could be reduced without reducing the blade aerodynamic performance,respectively.It is proved that blade maximum temperature and volume-average temperature could be greatly reduced by the combination of this two new designs.Finally,the new combined cooling passage structure was optimized with better heat transfer performance.