Abstract
The cavitation flow in a low specific speed centrifugal pump was measured in detail. Eighteen Pressure transducers were installed in impeller vanes and unsteady pressure distribution over pressure side and suction side were captured. Cavitation characteristic was easily photographed in axial direction through transparent inlet volute casing and front shroud. At the BEP flow rate bubble cavitaion increases along the suction side while decreasing the NPSH. When bubble cavitation reaches the throat, wedge-like cavity appears at the pressure side and the head breakdown occurs steeply. At the high flow rate, wedge like cavity appears incipiently at the pressure side of the throat and head drops gradually. Single phase CFD shows good agreement with measured results at high NPSH.
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