对多段翼型流动结构的深入刻画和理解对于多段翼型的外形设计来说十分重要.在数值模拟的基础上,运用本征正交分解(proper orthogonal decomposition,POD)方法对多段翼型的数值结果进行重构和分析,对迎角变化情况下流动中的主要模态进行提取,并得到权函数随迎角变化的规律.针对嵌套网格的数值模拟流场的特点,通过对参与快照技术处理的数据进行筛选和还原,来避免无效数值对分析结果的影响.研究发现,流动中脉动流场所占的总能量比例相对较小,其整体POD能量谱收敛呈先快后慢的格局,大尺度的流动结构与流场中绝大部分的能量分布直接相关,且都包含在低阶模态中,而高阶模态则代表了复杂的脉动结构。 The deep characterization and understanding of multi-section airfoil flow structure is very important for the profile design of multi-section airfoils.Based on the numerical simulation, the proper orthogonal decomposition (POD) And the results are reconstructed and analyzed to extract the main modal flow in the case of changing angle of attack and get the law of weight function with angle of attack change.According to the numerical simulation of the flow field of the nested grid, Technology to process the data screening and reduction, to avoid the effect of invalid values ​​on the results of the study found that the flow of pulsatile flow field accounted for a relatively small proportion of the total energy, the overall POD energy spectrum was the first fast and then slow pattern The large-scale flow structure is directly related to most of the energy distribution in the flow field, and both are contained in the low-order modes, while the high-order modes represent the complex pulsation structure.