ABSTRACT
In recent years, the performance of turbochargers has been improved by adopting complex blade shapes, multi entry turbines and optimized bearing systems. The combination of multi entry turbines and sophisticated blade shapes requires special focus on blade vibration behaviour. It is challenging to identify the blade vibration response mode and measure the stress using conventional measurement techniques. In this research, turbine blade vibrations under rotation at high temperature and speed are visualized with Digital Image Correlation (DIC) technology using high-speed cameras. By analyzing the resonance frequency and blade displacement, it is possible to determine the response mode and the dynamic blade loading.
