Mistuning and Damping of Turbine and Compressor Impellers
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Turbocharging is known to be a well-established technology for an engine's efficiency and power output by forcing extra compressed air into the combustion chamber. The centrifugal loads, necessary flow deflections, unsteady pressure fluctuations, and structural temperature gradients put a high strain on rotating components. Additionally, those components are prone to high-cycle fatigue. The Chair of Structural Mechanics and Vehicle Vibrational Technology at the BTU Cottbus-Senftenberg investigated the impact of manufacturing tolerances on the vibrational behavior of several turbine and compressor impellers. Finally, it is shown that intentional mistuning can lead to significantly lower stresses.
Increasing requirements with respect to efficiency, performance and environmental aspects take the lead in the development of modern internal combustion engines. Thus, turbine and compressor impellers are state-of-the-art solutions in a wide range of application. Both exhaust and...
This report is the scientific result of the research project Mistuning and Damping III by the Research Association for Combustion Engines (FVV-EM Nr. 6012290). The authors gratefully acknowledge the support received from the FVV and from the expert group led by Thomas Winter.