动态温度畸变下压缩系统稳定性模型研究

THE MODEL FOR PREDICTING AERODYNAMIC STABILITY IN THE AXIAL COMPRESSION SYSTEMS WITH INLET DYNAMIC TEMPERATURE DISTORTIONS

关键词:  轴流式压缩机  系统稳定性  温度影响  稳定性预计

Key words:  Axial flow compressor  System stability  Temperature effect  Stability prediction

摘要:

推导并建立了动态温度畸变下多级轴流压缩系统稳定性分析的理论模型，并给出了基于特征线和ＭａｃＣｏｒｍａｃｋ二步差分法的数值分析方法。基于级特性，模型对一三级实验压气机进行了数值分析，给出了进口动态温度畸变与稳定裕度损失及与不稳定发生时间之间的定量关联关系。本模型还确定了压气机失稳的首发级。

Abstract:

theoretical model is established for predicting the aerodynamic stabilities in muilti-stage axial compressor systems, with inlet dynamic temperature distortion. The numerical method is given based on a method of characteristics and MacCormack’s finite difference scheme. By using this model, the predictions for a three-stage experimental axial compressor are given based on a set of stage-by-stage characteristics. The quantitive relationships between the inlet total temperature distortions and the surge margin losses or the time to surge are obtained. The first stage in which the flow instabilities occur is found using this method.