轴流式压气机特性线外推方法

针对现有轴流式压气机特性线雷诺相似外推方法的不足，提出划分虚拟微元级分段计算压气机特性的方法，将工质压缩过程分解成若干微元压缩段的叠加，使工况变化时微元压缩段进出口相似条件能够得到保证。在雷诺相似的基础上，将每一个微元压缩段外推，得到各微元压缩段特性图，并重构出压气机整机特性图。实例分析表明，新方法可以明显减小现有雷诺外推方法产生的误差，由于虚拟微元级概念的引入，拓宽了压气机特性线获取的途径，提高了获取特性线的可靠性。

EXTRAPOLATION METHOD OF CHARACTERISTIC MAPS OF AXIAL FLOW COMPRESSORS

A new method is proposed for extrapolating characteristic maps of multistage axial flow compressors based on an introduction of infinitesimal stage. With comparison from conventional Reynolds extrapolation method, the proposed method divides air-polytropic process into infinitesimal stage. Consequently, the condition required by Reynolds analogy (RA) is satisfied perfectly for the infinitesimal stage's approximation to RA premises. With this idea the entire characteristic map of compressor can be reconstructed by the combination of infinite-stage characteristic maps. Validation efforts show the discussed method has higher precision and fewer errors to simulate compressor operating process. This work contributes to the improvement of calculation characteristic maps of axial flow compressors.