压气机二维叶型的低速模拟分析

Analysis of the Low-Speed Similarity Design Principle for a Compressor Airfoil

针对二维基元的低速模拟做了一些理论分析探讨,初步理清了二维基元低速模拟过程中的关键因素,并总结必要的设计准则。然后,利用理论分析结果进行一个高速压气机叶型的低速模拟设计。研究结果表明采用叶表无量纲速度分布相似的低速模拟设计准则可以获得较好的低速模拟设计结果,低速模拟设计的叶型从设计点到近失速点之间的气流角损失特性与高速原型具有较好的一致性。

Some theoretical analyses have been done for the high-to-low blade airfoil similarity designs.The critical factors for the high-to-low transformations were clarified,and some design rules were also proposed.Based on the theoretical analyses,a high-to-low design case of a typical high subsonic compressor airfoil used in a rear stage of a high pressure compressor was carried out.The results showed that,by using the similar normalized blade surface velocity distribution to that in the high speed case to design the low speed airfoil,the low speed blade can achievethe similar blade characteristics to that of the high speed blade.Particularly,the characteristics curves of the inlet-flow-angle/total-pressure-loss for the low and high speed cases are nearly the same from the design condition to the near stall condition,the inflow angle-total pressure loss.