Gas Turbine Rotor/Case Structural Response to Rotating Stall: Experimental Documentation and Analytical Approach,
GENERAL MOTORS CORP INDIANAPOLIS IN DETROIT DIESEL ALLISON DIV
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This work presents experimental data describing the forcing functions and structural responses characterizing gas turbine rotorcase system vibration due to rotating stall in an axial-flow compressor. Two data sets with fundamentally different response characteristics are presented one is supersynchronous and the other subsynchronous. Conventional beam-element rotor dynamics analysis is shown to be severely limited in its ability to predict these responses. A new analytical approach, which significantly increases structural response predictive capability for these phenomena, is briefly discussed.