Abstract
The present work investigates the effects of shaft vibration on the anymmetric cavitation which is one of instability phenomena on cavitating 3-bladed inducers. Inducer tests under various unbalance conditions have been carried out to make clear the effects of shaft vibration. Consequently, the following results have been obtained. (1) The amplitude of shaft vibration has a strong effect on the occurrence of the asymmetric cavitation, then in the inducer with large vibration amplitude, the asymmetric cavitation easily occurs. (2) The phase of small tip clearance caused by shaft vibration coincides with the position of small cavity. This study shows that the decreasing shaft vibration is greatly important for avoiding harmful asymmetric cavitation.
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