Axial flow compressor modelling for engine health monitoring studies

The Canadian Patrol Frigate propulsion system includes two General Electric LM2500 gas turbines, a modern high pressure ratio engine which employs multiple stages of compressor variable geometry. Since significant variations in overall engine performance can result from the tolerances allowed on variable geometry setup or from a malfunction of the variable geometry system in service, a means of estimating the influence of changes in compressor variable geometry on LM2500 performance is required.;The new compressor performance modelling technique is based on a meanline stage-stacking analysis, relies only on the limited performance data typically made available by engine manufacturers and represents a considerable advance over previous methods used for Engine Health Monitoring studies. (Abstract shortened with permission of author.).;A general method for predicting the thermodynamic performance of variable geometry axial compressors has been developed. The method has been successfully applied. The variation in overall engine performance due to changes in compressor variable geometry setting has been estimated.