A reduced order model for coupled mode cascade flutter analysis |
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Institution: | 1. School of Power and Energy, Northwestern Polytechnical University, Xi’an 710072, China;2. Yangtze River Delta Research Institute of Northwestern Polytechnical University, Taicang 215400, China;3. Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China |
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Abstract: | A Reduced Order Model (ROM) based analysis method for turbomachinery cascade coupled mode flutter is presented in this paper. The unsteady aerodynamic model is established by a system identification technique combined with a set of Aerodynamic Influence Coefficients (AIC). Subsequently, the aerodynamic model is encoded into the state space and then coupled with the structural dynamic equations, resulting in a ROM of the cascade aeroelasticity. The cascade flutter can be determined by solving the eigenvalues of the ROM. Bending-torsional coupled mode flutter analysis for the Standard Configuration Eleven (SC11) cascade is used to validate the proposed method. |
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Keywords: | Aerodynamic influence coefficients Chirp signal Coupled mode flutter Eigenvalue problem Reduced order model |
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