Open AccessStereo-PIV study of unsteady flow in a laboratory air hydro turbine model over a wide range of operating regimes
Author(s) -
Ivan V. Litvinov,
D. K. Sharaborin,
Evgeny Gorelikov,
Daniil Suslov,
С. И. Шторк
Publication year - 2021
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/774/1/012044
Subject(s) - draft tube , aerodynamics , turbine , vortex , mechanics , range (aeronautics) , flow (mathematics) , acoustics , tube (container) , materials science , physics , thermodynamics , composite material
Swirl flow with the formation of a precessing vortex core (PVC) in a hydro turbine draft tube model was studied using Stereo-PIV and four acoustic sensors. Experiments were performed on an aerodynamic setup in a wide range of operating conditions of the hydro turbine. Using a spatial Fourier decomposition of pressure pulsation data obtained from four acoustic sensors, a PVC was observed for part-load operating regimes (0.3-0.7 Q c ). Mean flow features were shown for the range of operating regimes from a deep part-load regime (0.3 Q c ) to an overload regime (1.5 Q c ). Based on phase-averaged velocity distributions, the PVC spatial structure was identified for maximum pressure pulsations on the cone walls of the draft tube.