Assessment of cavitation regime in divergent vortex flows

[摘要] The analysis of a cavitating swirling flow in a configuration similar to the flow at the entrance of a hydraulic turbine draft tube, except the rotational component, is proposed. This flow behaviour is essential for the hydraulic turbine operation in extended range and its understanding is essential for the turbine design improvement. Advanced 2D measurements of the velocity field using PIV techniques and unsteady pressure measurements are used to determine the σ number and velocity field for various stages of cavitation development.

[发布机构] National Institute for RandD in Electric Engineering ICPE-CA, 313 Splaiul Unirii, Bucharest; 030138, Romania^1;Laboratoire de Machines Hydrauliques, Universite de Laval, Loc.1341 Pav. Adrien-Pouliot, Quebec; QC; G1V 0A6, Canada^2

[关键词] 2-D measurements;Extended range;Flow behaviours;Hydraulic turbine draft tube;Rotational component;Turbine designs;Unsteady pressure measurements;Velocity field