Coupled Mode Flutter Analysis of Turbomachinery Blades Using an Adaptation of the p–k Method
| Autor: | Schuff, Matthias, Chenaux, Virginie |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Energy Engineering and Power Technology
Aerospace Engineering 02 engineering and technology 01 natural sciences fan 010305 fluids & plasmas aerodynamic coupling 0203 mechanical engineering Normal mode 0103 physical sciences Turbomachinery turbomachinery lightweight Physics damping Mechanical Engineering Aerodynamics Mechanics Mass ratio Aeroelasticity aeroelasticity 020303 mechanical engineering & transports Fuel Technology flutter Nuclear Energy and Engineering Frequency domain coupled mode compressor Flutter mass ratio vibration Transonic |
| Zdroj: | Journal of Engineering for Gas Turbines and Power. 143 |
| ISSN: | 1528-8919 0742-4795 |
| DOI: | 10.1115/1.4048986 |
| Popis: | Current trends in turbomachinery design significantly reduce the mass ratio of structure to air, making them prone to flutter by aerodynamic coupling between mode shapes, also called coupled-mode flutter. The p-k method, which solves an aeroelastic eigenvalue problem for frequency and damping respectively excitation of the aerodynamically coupled system, was adapted for turbomachinery application using aerodynamic responses computed in the frequency domain. A two-dimensional test case is validated against time-marching fluid-structure coupled simulations for subsonic and transonic conditions. A span of mass ratios is investigated showing that the adapted p-k method is able to predict the transition between aeroelastically stable and unstable cascades depending on the mass ratio. Finally, the p-k method is applied to a low mass ratio fan showing that the flutter-free operating range is significantly reduced when aerodynamic coupling effects are taken into account. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|