Abstract
Two-dimensional, two component particle image velocimetry (PIV) measurements
of the guide-vane wake and vaneless space for a high head Francis model turbine are presented.
Measurements have been carried out with a fixed head and rotational speed for a set of guidevane openings representative of part load, high load and best efficiency operating points. The
measured trajectory and strength of the guide vane wake for the different operating points is
discussed in conjunction with the periodic velocity oscillations. It is hoped that the present
measurements will aid in further analysis as well as provide an additional set of data for
validation of numerical analyses.
of the guide-vane wake and vaneless space for a high head Francis model turbine are presented.
Measurements have been carried out with a fixed head and rotational speed for a set of guidevane openings representative of part load, high load and best efficiency operating points. The
measured trajectory and strength of the guide vane wake for the different operating points is
discussed in conjunction with the periodic velocity oscillations. It is hoped that the present
measurements will aid in further analysis as well as provide an additional set of data for
validation of numerical analyses.
