Open AccessNovel techniques for the analysis of dynamic pressure in penstocks
Author(s) -
Fabien Chevillotte,
Goran Pavić,
Guillaume Dubois,
Gilles Proulx,
Martin Gag
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 - 10.1088/1755-1315/774/1/012042
Subject(s) - penstock , strain gauge , pressure measurement , dynamic pressure , line (geometry) , pressure sensor , hydropower , electrical conduit , vibrating wire , acoustics , power (physics) , engineering , structural engineering , electrical engineering , mechanical engineering , mechanics , physics , mathematics , geometry , quantum mechanics
This paper focuses on the analysis of dynamic pressure fluctuations in hydro-electric power plants. Pressure fluctuations are usually measured with remote sensors and the dynamic behaviour of the remote tubing line modifies the readings of dynamic pressure and thus introduces a bias. A method to characterize the remote tubing line and to correct the actual pressure is proposed. The corrected measurements are compared with those obtained using intrusive flush-mounted sensors as well as non-intrusive sensors (PVDF wires and strain gauges). Then, the technique to separate the forward and backward components of the obtained pressure pulsations is outlined. It is further shown how the pulsations and the hoop stresses can be reconstructed along the penstock. Finally, measurements carried out in a hydropower plant are presented to demonstrate the proposed techniques applicability for the analysis of dynamic pressure in a penstock. The results show that a pressure profile can be mapped along the penstock length which allows a comparison with the direct pressure sensor measurements.