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Turbulence influence on wind energy extraction for a medium size 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
Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, Bio- och miljösystemforskning (BLESS), Energiteknik.
Uppsala University, Uppsala, Sweden.
Uppsala University, Uppsala, Sweden.
Vise andre og tillknytning
2016 (engelsk)Inngår i: Wind Energy, ISSN 1095-4244, E-ISSN 1099-1824, Vol. 19, nr 11, s. 1963-1973Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The relation between power performance and turbulence intensity for a VAWT H-rotor is studied using logged data from a 14 month (discontinuous) period with the H-rotor operating in wind speeds up to 9 m/s. The turbine, designed originally for a nominal power of 200 kW, operated during this period mostly in a restricted mode due to mechanical concerns, reaching power levels up to about 80 kW. Two different approaches are used for presenting results, one that can be compared to power curves consistent with the International Electrotechnical Commission (IEC) standard and one that allows isolating the effect of turbulence from the cubic variation of power with wind speed. Accounting for this effect, the turbine still shows slightly higher efficiency at higher turbulence, proposing that the H-rotor is well suited for wind sites with turbulent winds. The operational data are also used to create a Cp(λ) curve, showing slightly lower Cp compared with a curve simulated by a double multiple streamtube model. Copyright © 2016 John Wiley & Sons, Ltd.

sted, utgiver, år, opplag, sider
Chichester: John Wiley & Sons, 2016. Vol. 19, nr 11, s. 1963-1973
Emneord [en]
VAWT, H-rotor, turbulence intensity, power coefficient curve
HSV kategori
Identifikatorer
URN: urn:nbn:se:hh:diva-30366DOI: 10.1002/we.1962ISI: 000386149700001Scopus ID: 2-s2.0-84990178448OAI: oai:DiVA.org:hh-30366DiVA, id: diva2:904635
Forskningsfinansiär
StandUpTilgjengelig fra: 2016-02-19 Laget: 2016-02-19 Sist oppdatert: 2018-03-22bibliografisk kontrollert
Inngår i avhandling
1. Noise, eigenfrequencies and turbulence behavior of a 200 kW H-rotor vertical axis wind turbine
Åpne denne publikasjonen i ny fane eller vindu >>Noise, eigenfrequencies and turbulence behavior of a 200 kW H-rotor vertical axis wind turbine
2017 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
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
Emneord
VAWT, H-rotor, eigenfrequency, semi-guy-wired tower, noise emission, sound power level, microphone array, turbulence intensity, power curve
HSV kategori
Identifikatorer
urn:nbn:se:hh:diva-33834 (URN)978-91-554-9834-4 (ISBN)
Disputas
2017-04-28, Häggsalen, Lägerhyddsvägen 1, Uppsala, 13:00 (engelsk)
Opponent
Veileder
Forskningsfinansiär
StandUp
Tilgjengelig fra: 2017-05-11 Laget: 2017-05-10 Sist oppdatert: 2018-03-23bibliografisk kontrollert

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