Forced Response and Surge Behaviour of IP Core-Compressors With Ice-Damaged Rotor Blades

This paper deals with performance, forced response and surge issues arising in ice-damaged IP compressor assemblies. In addition to the inherent blade-passing excitation, damaged rotor blades may cause low engine-order excitation for both upstream and downstream blade rows, the strength of which depends on the severity, location and circumferential distribution of the damage. Similarly, performance and surge stability are related to the nature of the blockage caused by the damaged blades. Several symmetric and asymmetric damage configurations were studied using a 49-bladed rotor assembly in order to quantify the consequences of ice damage and assess the maximum amount of damage that can be tolerated. Both single-row part-annulus and multi-row whole-annulus models were used in the numerical study.