宽广攻角范围内不同加载形式涡轮气动性能研究

Research of Aerodynamic Performance of Turbine Blade with Different Loading Distribution at Wind Range Incidence

攻角和负荷分布形式的变化必然会导致涡轮叶片边界层结构的改变,从而影响涡轮的损失特性。本文通过设计负荷能力相同而负荷分布形式不同的3种叶型分析在宽广的攻角范围内,负荷分布对涡轮叶型边界层发展的影响规律。研究结果表明:前加载和均匀加载叶型在宽广的攻角范围内表现较低的损失特性,尤其是在负攻角范围内;后加载叶型的设计使得边界层提前转捩,气动损失较大。

The boundary layer structure would be changed because of varies of incidence and loading distribution, so the loss property will be varied. The effect law of loading distribution on boundary layer development at wide range incidence was studied through design three turbine blades with different load distribution but same load level. The research indicates that： the aerodynamic loss is at low level for front and middle loaded turbine blade at wind range incidence especially for negative incidence, while the aerodynamic loss of aft loaded blade is high because of the advanced boundary laver transition.