IAHR, founded in 1935, is a worldwide independent member-based organisation of engineers and water specialists working in fields related to the hydro-environmental sciences and their practical application. Activities range from river and maritime hydraulics to water resources development and eco-hydraulics, through to ice engineering, hydroinformatics, and hydraulic machinery.
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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 4: Responding to Shifting Water Resources : Experimental study of back flushing of trash racks
Experimental study of back flushing of trash racks
Author : H. Nøvik1, O.Jørstad1 and L. Lia1
Back flushing of trash racks at intakes for hydro power plants is a hydraulic based alternative to manual or mechanical removal of debris causing loss of total pressure and reduction of clean energy production. Higher frequency of floods in a river can increase already existing problems with trash and floating debris. Characteristics of a flow associated with effective back flushing are investigated in a laboratory flume provided with a section of a full scale, reversible, trash rack and in a prototype, Eidsdal Power Plant. Key parameters studied are the relative flushing velocity, the flushing duration and the initial head loss over the trash rack before back flushing. Clogged debris is efficiently removed by a back flushing process and the efficiency tends to increase with decreasing initial head loss. Most of the debris is loosened with the first minute of back flushing.
File Size : 535,255 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 4: Responding to Shifting Water Resources
Date Published : 01/07/2011
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