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Turbulence influence on optimum tip speed ratio for a 200 kW vertical axis wind turbine
Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Energiteknik. Uppsala University, Uppsala, Sweden.ORCID-id: 0000-0001-9982-5317
Uppsala University, Uppsala, Sweden.
Uppsala University, Uppsala, Sweden.
Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Energiteknik.
Visa övriga samt affilieringar
2016 (Engelska)Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

The influence of turbulence intensity (TI) on the tip speed ratio for maximum power coefficient, here called λCp-max, is studied for a 200 kW VAWT H-rotor using logged data from a 14 month period with the H-rotor operating in wind speeds up to 9 m/s. The TI - λCp-max relation is examined by dividing 10 min mean values in different turbulence intensity ranges and producing multiple CP(λ) curves. A clear positive relation between TI and λCp-max is shown and is further strengthened as possible secondary effects are examined and deemed non-essential. The established relation makes it possible to tune the control strategy to enhance the total efficiency of the turbine.

Ort, förlag, år, upplaga, sidor
Bristol: Institute of Physics Publishing (IOPP), 2016. Vol. 753, artikel-id 032048
Serie
Journal of Physics Conference Series, ISSN 1742-6588 ; 753
Nationell ämneskategori
Energiteknik
Identifikatorer
URN: urn:nbn:se:hh:diva-32175DOI: 10.1088/1742-6596/753/3/032048Scopus ID: 2-s2.0-84995467631OAI: oai:DiVA.org:hh-32175DiVA, id: diva2:1033749
Konferens
6th Science of Making Torque from Wind Conference, Technical University of Munich, Munich, Germany, Oct. 5-7, 2016
Forskningsfinansiär
StandUpTillgänglig från: 2016-10-09 Skapad: 2016-10-09 Senast uppdaterad: 2018-03-23Bibliografiskt granskad
Ingår i avhandling
1. Noise, eigenfrequencies and turbulence behavior of a 200 kW H-rotor vertical axis wind turbine
Öppna denna publikation i ny flik eller fönster >>Noise, eigenfrequencies and turbulence behavior of a 200 kW H-rotor vertical axis wind turbine
2017 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Vertical-axis wind turbines (VAWTs) have with time been outrivaled by the today more common and economically feasible horizontal-axis wind turbines (HAWTs). However, VAWTs have several advantages which still make them interesting, for example, the VAWTs can have the drive train at ground level and it has been argued that they have lower noise emission. Other proposed advantages are suitability for both up-scaling and floating offshore platforms.

The work within this thesis is made in collaboration between Halmstad University and Uppsala University. A 200-kW semi-guy-wired VAWT H-rotor, owned by Uppsala University but situated in Falkenberg close to Halmstad, has been the main subject of the research although most results can be generalized to suit a typical H-rotor.

This thesis has three main topics regarding VAWTs: (1) how the wind energy extraction is influenced by turbulence, (2) aerodynamical noise generation and (3) eigenfrequencies of the semi-guy-wired tower.

The influence from turbulence on the wind energy extraction is studied by evaluating logged operational data and examining how the power curve and the tip-speed ratio for maximum Cp is impacted by turbulence. The work has showed that the T1-turbine has a good ability to extract wind energy at turbulent conditions, indicating an advantage in energy extraction at turbulent sites for VAWTs compared to HAWTs.The noise characteristics are studied experimentally, and models of the two most likely aerodynamic noise mechanisms are applied. Here, inflow-turbulence noise is deemed as the prevailing noise source rather than turbulent-boundary-layer trailing-edge noise (TBL-TE) which is the most important noise mechanism for HAWTs. The overall noise emission has also been measured and proven low compared to similar sized HAWTs.

The eigenfrequencies of a semi-guy-wired tower are also studied. Analytical expressions describing the first-mode eigenfrequency of both tower and guy wire has been derived and verified by experiments and simulations.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2017. s. 89
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1485
Nyckelord
VAWT, H-rotor, eigenfrequency, semi-guy-wired tower, noise emission, sound power level, microphone array, turbulence intensity, power curve
Nationell ämneskategori
Energiteknik
Identifikatorer
urn:nbn:se:hh:diva-33834 (URN)978-91-554-9834-4 (ISBN)
Disputation
2017-04-28, Häggsalen, Lägerhyddsvägen 1, Uppsala, 13:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
StandUp
Tillgänglig från: 2017-05-11 Skapad: 2017-05-10 Senast uppdaterad: 2018-03-23Bibliografiskt granskad

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