Open AccessExperimental research on pressure fluctuation characteristics of high-head Francis turbine under part load conditions
Author(s) -
Minjia Chen,
Guojun Zhu,
Zirui Wang,
Yunzhe Li
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/510/2/022009
Subject(s) - draft tube , francis turbine , turbine , cavitation , rotor (electric) , head (geology) , mechanics , stator , power (physics) , amplitude , vibration , vortex , physics , materials science , engineering , mechanical engineering , geology , thermodynamics , acoustics , optics , geomorphology
Pressure fluctuation at partial load operation is an obvious and harmful phenomena in Francis turbines. It could be induced by rotor stator interaction and cavitation vortex rope in draft tube and must be minimized during the design of Francis turbine. To reduce the pressure fluctuation at partial load operation, accurate assessment of the cause of this phenomena is crucial. In this paper, a reduced-scale physical model of a high head Francis turbine is used as the research object, and the test technique is applied to investigate the excitation source of the pressure fluctuation at two partial load operation conditions. Based on experimental data, it can be concluded that the amplitude of pressure fluctuation in the draft tube significant is increased with the decrease of the power of turbine, which is indicated that the stability of turbine deteriorated sharply with the power reduced. But the dominant frequency of the pressure fluctuation is almost the same. And the strong pressure fluctuation in the draft tube can be transmitted to the upstream components, which are affected the pressure fluctuation caused by rotor stator interaction.