Aeroelastic Stability Analysis in Turbomachinery Systems

Aeroelastic stability analysis in turbomachinery systems addresses the dynamic interaction between aerodynamic forces and structural deformations of rotating blades and discs. These interactions can lead to self-excited oscillations, commonly known as flutter, which if not mitigated can cause high-cycle fatigue, reduced efficiency and catastrophic failure. The analysis employs a variety of computational fluid dynamics techniques, reduced-order modelling and experimental validation to predict stability boundaries and guide design. Modal analysis yields natural frequencies and mode shapes of blades, while fluid–structure interaction methods capture the feedback between unsteady aerodynamic loads and blade deformation. Two main classes of analytical techniques exist: energy methods, which assume a one-way coupling where the fluid’s work on the structure is evaluated, and fully coupled eigenvalue approaches that account for mutual fluid–structure feedback. Recent advances have focused on enhancing fidelity and reducing computational cost through hybrid simulation strategies, model order reduction and physics-driven machine learning. These approaches support the development of thinner, more highly loaded blades in compressor and turbine stages, meeting modern demands for improved thermal efficiency and lower emissions. Practical applications span aero engines, power-generation turbines and turbochargers, where aeroelastic stability maps inform operational limits and safe design margins. Emerging research highlights the critical roles of geometric factors—such as blade thickness, tip clearance and shock interaction—as well as acoustic reflections within intake systems. Together, these efforts advance global turbomachinery performance and reliability by enabling robust predictive tools for aeroelastic phenomena.

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Aeroelastic Stability Analysis in Turbomachinery Systems publication trend

The graph below shows the total number of articles in aeroelastic stability analysis in turbomachinery systems across all publications each year (not limited to Nature Index journals).

Technical terms

Aeroelasticity: The study of interdependent aerodynamic, elastic and inertial forces acting on a body in a fluid flow.

Flutter: A self-excited, dynamic instability arising from the feedback between unsteady aerodynamic forces and structural vibrations.

Modal damping: A measure of energy dissipation per vibration cycle in a specific structural mode.

Reduced-order model: A simplified mathematical model that captures dominant dynamic behaviour of a high-fidelity system at reduced computational cost.

Fluid–structure interaction (FSI): Computational or experimental methods that capture the bidirectional coupling between fluid flow and structural deformation.

References

1. Blade thickness effects on viscous flutter in a radial turbocharger turbine. Engineering Failure Analysis (2022).
2. A Review of Computational Methods and Reduced Order Models for Flutter Prediction in Turbomachinery. Aerospace (2021).
3. Aeroelastic Stability of Combined Plunge-Pitch Mode Shapes in a Linear Compressor Cascade †. International Journal of Turbomachinery Propulsion and Power (2022).
4. Aerodynamic Analysis of Blade Stall Flutter Prediction for Transonic Compressor Using Energy Method. Aerospace (2024).
5. Influence of the Tip Clearance on the Aeroelastic Characteristics of a Last Stage Steam Turbine. Applied Sciences (2019).
6. Effect of Intake Acoustic Reflection on Blade Vibration Characteristics. Aerospace (2024).
7. Physics guided machine learning modelling of compressor stall flutter. Journal of the Global Power and Propulsion Society (2024).