2434 Casing Treatment for Suppression of Cavitation Surge : 1st report : Observation of Inducer Internal Flow with Stroboscope

Abstract

Casing treatment with an aim for the suppression of cavitation surge was experimented. For the investigation of internal flow, the observations of cavitation phenomena with stroboscope were conducted. FFT analysis showed that weak cavitation surge appeared at low cavitation numbers. However, the peak of the cavitation surge became lower level using the casing treatment. In addition, suction performance did not gradually increase, i.e., dynamic gain was almost flat.