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Experimental Study of Head Loss over Laser Scanned Rock Tunnel
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0001-9426-2375
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-4916-9566
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0002-8360-9051
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.
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Number of Authors: 52016 (English)In: Experimental Study of Head Loss over Laser Scanned Rock Tunnel: Hydraulic Structures and Water System Management, ISHS 2016, Portland, United States, 27 - 30 June 2016, Portland: Utah State University , 2016, p. 22-29Conference paper, Published paper (Refereed)
Abstract [en]

Flow in hydropower tunnels is characterized by a high Reynolds number and often very rough rock walls. Due to the roughness of the walls, the flow in the tunnel is highly disturbed, resulting in large fluctuations of velocity and pressure in both time and space. Erosion problems and even partial collapse of tunnel walls are in some cases believed to be caused by hydraulic jacking from large flow induced pressure fluctuations. The objective of this work is to investigate the effects of the rough walls on the pressure variations in time and space over the rock surfaces. Pressure measurement experiments were performed in a 10 m long Plexiglas tunnel where one of the smooth walls was replaced with a rough surface. The rough surface was created from a down-scaled (1:10) laser scanned wall of a hydraulic tunnel. The differential pressure was measured at the smooth surface between points placed at the start and end of the first four 2 m sections of the channel. 10 gauge pressure sensors where flush mounted on the rough surface; these sensors measure the magnitude and the fluctuations of the pressure on the rough surface. The measurements showed significant spatial variation of the pressure on the surface. For example, sensors placed on protruding roughness elements showed low gauge pressure but high fluctuations. The differential pressure indicated a head loss through the tunnel that was almost four times higher than a theoretical smooth channel.

Place, publisher, year, edition, pages
Portland: Utah State University , 2016. p. 22-29
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-40310DOI: 10.15142/T360628160853Scopus ID: 2-s2.0-84988981565Local ID: f63f31d3-d2db-4351-8149-87a65d10ced0ISBN: 978-1-884575-75-4 (electronic)OAI: oai:DiVA.org:ltu-40310DiVA, id: diva2:1013832
Conference
International Symposium on Hydraulic Structures : 27/06/2016 - 30/06/2016
Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2023-09-05Bibliographically approved
In thesis
1. Modelling flow over rough surfaces in hydropower waterways
Open this publication in new window or tab >>Modelling flow over rough surfaces in hydropower waterways
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Luleå: Luleå University of Technology, 2018
Series
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
urn:nbn:se:ltu:diva-71104 (URN)978-91-7790-224-9 (ISBN)978-91-7790-225-6 (ISBN)
Public defence
2018-11-23, E632, Luleå tekniska universitet, Luleå, 10:00 (English)
Opponent
Supervisors
Available from: 2018-10-08 Created: 2018-10-04 Last updated: 2018-11-21Bibliographically approved

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Andersson, RobinLarsson, SofiaHellström, GunnarAndreasson, PatrikAndersson, Anders

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