The paper presents a numerical analysis of flow in a 6-jet Pelton turbine for
1-nozzle operation. Flow in the manifold with injectors was analysed in order to get inlet
conditions for runner analysis, which was at first performed without cavitation.
Numerically obtained efficiency value was compared to the measured value from the test
rig. The simulation was repeated with cavitation included. Small vapour cavity at the
inner side and a larger one at the back side of the buckets were observed. Detailed
analysis of results showed that the conditions for cavitation pitting were not fulfilled.
Additionally, with cavitation modelling the accuracy of efficiency prediction improved.
