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- Title
Hydraulics of backflushing for efficiently cleaning hydropower trash racks.
- Authors
Nøvik, Hanne; Lia, Leif; Rettedal, Bjørnar; Nielsen, Lars Eid
- Abstract
Backflushing is an efficient alternative for cleaning trash racks at small hydropower plants. The actual debris to trash rack adhesion is measured in situ for the first time by an innovative, custom-made measuring device. Despite large measurement variations caused by unevenness in debris distribution, the adhesion to trash rack for most types of debris and for most sites is relatively modest. There is also a trend where a higher maximum head loss through the trash rack increases the debris adhesion to the trash rack. The hydraulics around the trash rack during a backflushing process is assessed by monitoring the velocity development and the pressure difference through the trash rack in a physical model. As expected, when debris adhesion to the trash rack is high, releasing the attached debris requires a higher pressure difference through the trash rack and a higher approach velocity.
- Subjects
HYDROELECTRIC power plants; REVERSIBLE flow trashracks; MARINE debris; ADHESION; MAINTENANCE costs; HYDRODYNAMICS; PRESSURE sensors; FOURIER transforms
- Publication
Canadian Journal of Civil Engineering, 2014, Vol 41, Issue 3, p263
- ISSN
0315-1468
- Publication type
Article
- DOI
10.1139/cjce-2013-0291