Transient Blade Response Due To Surge Induced Structural Loads

Axial compressor blade durability is addressed from the standpoint of a surge induced structural load. The qualitative characteristics of the aerodynamic and structural dynamic phenomena of surge loads and deflections are considered. Pertinent technology from the available literature is surveyed and extended to specific aspects of the problem. Analytical models for predicting load magnitudes and distributions as a function of time are presented along with the corresponding transient structural dynamic model. Results are presented for a isolated airfoil response. Assumptions, limitations, and parametric studies of the various components of the analytical models are discussed and areas of future work identified. Experimental programs which are required to validate the analytical model are proposed and the high response instrumentation requirements identified for rig or engine testing that will provide the detailed data for validating the analytical model.