Impeller integrated measurement of cavitation erosive aggressiveness

Abstract For the online measurement of erosive cavitation aggressiveness in hydraulic turbomachinery a system is developed, which is based on the measurement of the structure born noise. The direct coupling of the piezoelectric sensor on the exposed impeller provides a minimisation of the disturbance of the signal. A signal processing device and a transmission system have to be integrated into the rotating system too. This system may be used to detect critical cavitating operation conditions or for active control.