Rotor-stator interactions have been widely studied for thirty years especially concerning part load operating points. Transient phenomena are mainly the focus of these experimental or numerical studies. Depending on type of centrifugal pumps, an unstable characteristic (saddle-type characteristic) can appear at part load; the consequence is an unstable local head drop of the performance curve and this singularity exhibits a positive slope in the decreasing performance curve. An experimental work is proposed to identify this instability and the investigations led on a high specific speed centrifugal pump have allowed to study the interaction with the upstream circuit and the cavitation, the translation on other speed of rotation and the effect on the vibrations level.

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