By changing the profile hydrodynamic shape, two different profiles were studied for circumferential fluid kinematics and the occurrence of cavitation in order to reduce cavitation phenomena on Kaplan turbine runner blades and consequently improve energy performance. For the analysis of the results, a large amount of data were obtained by means of measurements of integral quantities and visually with the help of computer-aided visualization on profiles in the cavitation tunnel and Kaplan runner blades on the test rig for model tests. The experiment results indicate a proper in a good correlation between the shape of profile and cavitation phenomena. Confirmation of the correct shape correction on profiles was made by testing two different runner blade shapes.
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