Forschung für den Mittelstand - Die IGF-Projektdatenbank

Experimentelle und numerische Untersuchung zum Einfluss von aerodynamischer Belastung und Staffelung auf die aeroelatische Stabilität kombinierter Biege-Torsions-Eigenformen von Verdichterschaufeln

The pursuit of lighter, more efficient gas turbine engines has led to compressors with thinner, more aerodynamically loaded blades with reduced mechanical damping, promoting the occurrence of aeroelastic phenomena such as flutter.

Flutter can lead to harmful blade vibration and eventually cause high-cycle fatigue within a short time. This puts the structural integrity of the machine at risk and must be avoided. Unexpected flutter during engine design, testing and operation indicate the need for improved design methodologies. Current design processes rely heavily on aeroelastic parameters because aeroelastic simulations are extremely cost and time consuming. To ensure the suitability of these design parameters for the next generation of aero engines, they must be improved and experimentally validated.

It is known from numerical and analytical work that the flutter boundaries can be shifted by controlling the ratio of torsion to flap component in a combined fundamental mode shape. Systematic investigation of this mode shape design parameter in the ongoing forerunner project has shown that considering the mode decomposition alone is not enough to predict flutter stability, instead it indicates a strong interaction with steady flow parameters.

The objective of this project is to extend the experimental and numerical set-ups to investigate additional parameters, namely steady aerodynamic loading and cascade geometry. A sensitivity study will be conducted with CFD to analyze the interaction of design parameters and derive a reduced order model for flutter. This reduces the need for time-consuming computations and design iterations, and will contribute to a deeper physical understanding of flutter.

The developed methods and parameters will be summarized in a handbook and will enable the SMEs to be competitive in the aeroelastic design process. SMEs providing aeroelastic CFD simulation services or code development can utilize the measurement data set for validation.