期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 100, 期 -, 页码 349-359出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2018.09.015
关键词
Cavitation; Hydraulic turbines; Precessing vortex core; Pressure surge; Swirling flow; Vortex ring
资金
- Russian Science Foundation [16-19-00138]
- Russian Science Foundation [16-19-00138] Funding Source: Russian Science Foundation
An experimental investigation of the cavitating turbulent flow in a simplified hydraulic turbine was carried out to examine flow features in a wide range of speed and discharge conditions. A swirling device that allows reproducing the speed distribution behind the runner of a real turbine was manufactured using a rapid 3D prototyping technology. Laser Doppler velocimetry was used to measure both axial and tangential velocity components at the runner outlet for 96 operating regimes. The limitations of the swirl number used for swirling flow characterization through swirl free speed and discharge conditions were investigated. Particular attention was paid to the instability of the precessing vortex rope in the transition regime at a low swirl number. The boundaries of the regime with an aperiodic pressure surge in terms of the swirl number were defined, contributing to insight into the stability of swirling flow in hydraulic turbines.
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