Flow and turbulence in the discharge of radial pumping turbines: Influenceof the turbine type

Velocity measurements were made in the impeller discharge of 6SRGT- and Rus hton-type impellers in a 0.6 m(3) tank using, constant temperature anemomet ry with a direction sensitive split-film probe. The reproducibility error o f the measurement system was found to be greater than 5 % for all measured properties. The main flow and turbulent parameters measured at three agitat ion rates in the impeller discharge are compared for the two turbines with respect to both agitation rate and the measured power input. For comparison of the flow properties in the centerline of the two turbines having differ ent diameter and blade height, a uniform representation was used treating t he impeller stream as a special kind of free jet. Using this representation , we obtained similar results for both turbines on all measured parameters. The profile measurements showed a similar main flow field for both turbine s, but significant differences were found in the axial distribution of turb ulent kinetic energy and the energy dissipation rate.