基于局部拟合的压气机叶片加工坐标生成方法

Method of Generating Compressor Airfoil Manufacturing Coordinates Based on Local Fitting

关键词:  推进系统  轴流压气机  有限元分析  局部拟合  加工坐标

Key words:  Propulsion system  Axial compressor  Finite element analysis  Local fitting  Manufacturing coordinate

摘要:

为提高轴流压气机叶片加工坐标的生成效率，提出了一种基于前缘局部拟合技术的加工坐标生成方法，包括网格插值、造型逼近、局部拟合和叶型光顺等步骤。以多级高效率高负荷轴流压气机第2级转子为例，通过几何分析与计算流体动力学分析检验了该方法。结果表明，本文方法所生成的叶片加工坐标几何准确性满足工程需求，且相比现有技术可使叶片热转冷有限元分析环节的计算时间节省75%以上。

Abstract:

In order to improve the efficiency of generating airfoil manufacturing coordinates for axial compressor， a generating method was proposed based on leading edge local fitting technique. The method includes mesh interpolation， model approaching， local fitting， and profile smoothing. It was verified on the second rotor of a high efficiency and highly loaded multistage axial compressor， through geometry analysis and computational fluid dynamics analysis. The results validated the geometry precision of the generated airfoil manufacturing coordinates， while the computation time for blade hot-to-cold transform finite element analysis was reduced over 75% compared with the current technique.