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Inlet Blockage Effects in a Free Surface Channel With Artificially Generated Rough Walls
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics. (Strömningslära)ORCID iD: 0000-0001-9426-2375
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Fluid and Experimental Mechanics.ORCID iD: 0000-0003-3408-9237
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. Vattenfall Research and Development, Älvkarleby.
2018 (English)In: Proceedings of the 7th IAHR International Symposium on Hydraulic Structures / [ed] Daniel Bung ; Blake Tullis, 2018, p. 723-732Conference paper, Published paper (Refereed)
Abstract [en]

When considering free surface flow in channels, it is essential to have in-depth knowledge about the inlet flow conditions and the effect of surface roughness on the overall flow field. Hence, we hereby investigate flow inside an 18m long channel by using Particle Tracking Velocimetry (PTV) and Acoustic Doppler Velocimetry (ADV). The roughness of the channel walls is generated using a diamond-square fractal algorithm and is designed to resemble the actual geometry of hydropower tunnels. Four different water levels ranging from 20 to 50cm are investigated. For each depth, the inlet is blocked by 25 and 50% at three positions each, at the centre, to the right and to the left in the flow-direction. The flow is altered for each depth to keep the flow velocity even throughout the measurements. PTV is applied to measure the velocity of the free water surface; four cameras are placed above the setup to capture the entirety of the channel. The results show a clear correlation between roughness-height and velocity distribution at depths 20-30 cm. The surface roughness proved effective in dispersing the subsequent perturbations following the inlet blockage. At 50cm, perturbations from the 50% blockage could be observed throughout the channel. However, at 20cm, most perturbations had subsided by a third of the channel length. The ADV was used to capture the velocity in a total of 375 points throughout the channel, at a depth of 50 cm with no inlet perturbations.

Place, publisher, year, edition, pages
2018. p. 723-732
Keywords [en]
Hydraulic roughness, PTV, diamond-square algorithm, free-surface flows
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-71096DOI: 10.15142/T3P644Scopus ID: 2-s2.0-85054178430ISBN: 9780692132777 (print)OAI: oai:DiVA.org:ltu-71096DiVA, id: diva2:1253276
Conference
7th International Symposium on Hydraulic Structures, Aachen, Germany, 15-18 May 2018
Available from: 2018-10-04 Created: 2018-10-04 Last updated: 2023-09-04Bibliographically 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, RobinBurman, AntonHellström, J. Gunnar I.Andreasson, Patrik

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