压气机加级设计的匹配问题

对一台下游加级的三级压气机级间匹配问题进行了分析研究。加级后压气机前、后段间的流量不匹配主要是由压气机的放型设计、叶片弹性变形和低展弦比叶片的非定常效应三个因素造成的。用压气机切顶试验进行了验证 ,流量匹配性改善后压气机的喘振裕度提高 5.8个百分点

MISMATCH ANALYSIS BETWEEN COMPRESSOR STAGES

A new three-stage compressor has been made by scaling up a two-stage transonic compressor and adding a third stage in order to enhance its mass flow and pressure ratio.Its tests show that serious flow mismatch exists between second stage and third stage.Factors for the flow mismatch are found out as effect of scaling up coefficient on flow block factor,variation of its rotor blade airfoil section stagger angles due to centrifugal force and the unsteady effect for supersonic blading with low aspect ratio.Owing to above mentioned three factors,the flow capaility of third stage is increased by 6 3%.Tip-cut of the third stage demonstrates that the flow-path-area of the third stage is reduced to 93 7% and modified three-stage compressor has good flow match between the second stage and third stage, as a result its surge margin is enhanced by 5 8%.