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Improving farm efficiency of interacting vertical‐axis wind turbines through wake deflection using pitched struts
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Elektricitetslära.ORCID-id: 0000-0001-5006-9231
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Elektricitetslära.
2019 (Engelska)Ingår i: Wind Energy, ISSN 1095-4244, E-ISSN 1099-1824, Vol. 22, nr 4, s. 538-546Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

This work presents a numerical study of the obtained performance and the resulting flow field between two interacting large scale vertical-axis wind turbines (VAWTs), under the influence of a deflected wake through the struts pitching of the upwind turbine. The configuration consists of two VAWTs aligned in the direction of the incoming flow in which a wide range of fixed struts pitching angles in the upwind turbine have been investigated. The main goal is to evaluate the influence of the wake deflection on the turbines performance while they are operating at their optimal tip speed ratio (TSR), and to reproduce the most relevant phenomena involved in the flow pattern of the interacting wake. Arrangements with cross-stream offsets have also been tested for quantifying the contribution of this modification into the overall performance. For this purpose, an actuator line model (ALM) has been implemented using the open-source CFD library OpenFOAM in order to solve the governing equations and to calculate the resulting flow. The Large eddy simulation (LES) approach is considered to reproduce the turbulence flow effects. A preliminary study to identify the optimal TSR of the interacting downwind turbine has been investigated.

Ort, förlag, år, upplaga, sidor
2019. Vol. 22, nr 4, s. 538-546
Nyckelord [en]
actuator line model (ALM), dynamic stall model (DSM), large eddy simulation (LES), vertical axis wind turbines (VAWTs), wake deflection
Nationell ämneskategori
Energiteknik Strömningsmekanik och akustik
Identifikatorer
URN: urn:nbn:se:uu:diva-348692DOI: 10.1002/we.2305ISI: 000461904600008OAI: oai:DiVA.org:uu-348692DiVA, id: diva2:1198218
Forskningsfinansiär
StandUp for WindTillgänglig från: 2018-04-17 Skapad: 2018-04-17 Senast uppdaterad: 2019-05-07Bibliografiskt granskad
Ingår i avhandling
1. Aerodynamic Studies of Vertical Axis Wind Turbines using the Actuator Line Model
Öppna denna publikation i ny flik eller fönster >>Aerodynamic Studies of Vertical Axis Wind Turbines using the Actuator Line Model
2018 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis addresses the unsteady aerodynamics involved in the operation of vertical axis wind turbines (VAWTs). The main focus is to represent and understand the most relevant phenomena within the resulting flow pattern as the wake structure, loads on the different turbine components and the performance of the rotor. An actuator line model has been used for this purpose.

This model has been validated against experimental measurements from diverse cases with different operating conditions in both confined wind tunnels and open site locations. Numerical works were carried out considering a wide range of tip speed ratios (TSRs), and therefore covering from the no stall to the deep stall regime. The latter requires the implementation of a dynamic stall model for the proper representation of the unsteady forces on the blades. Also, different inlet conditions such as a uniform flow, a logarithmic wind shear and an atmospheric boundary layer (ABL) have been tested. The so-called recycling method technique was used to produce the fully developed ABL flow. Additionally, the resulting wake and performance of interacting turbines has been studied.

Once the model was validated, two numerical study cases for large scale turbines were carried out. First, the performance and resulting flow field from both a horizontal axis wind turbine (HAWT) and VAWT were investigated when the turbines were operating at their optimal TSR and within the same ABL inflow boundary conditions. The influence of the variation on the atmospheric turbulence levels was also studied, as well as the differences and similarities on the obtained results for both type of turbines. Later, the performance improvement of two interacting VAWTs was investigated through the deflected wake produced by the pitched struts of the upstream turbine. This is presented as a novel mechanism to mitigate losses on interacting turbine arrangements (i.e. wind farms).

In general, there is a reasonable good agreement between numerical results and experimental measurements, and therefore, the applied ALM can be considered as a potential tool for VAWTs simulations, characterized by relatively low computational cost showing accuracy and numerical stability.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2018. s. 85
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1671
Nyckelord
wind power, vertical axis wind turbines (VAWTs), actuator line model (ALM), dynamic stall model (DSM), atmospheric boundary layer (ABL), wake deflection, atmospheric boundary layer (ABL)
Nationell ämneskategori
Teknik och teknologier
Forskningsämne
Teknisk fysik med inriktning mot elektricitetslära
Identifikatorer
urn:nbn:se:uu:diva-348346 (URN)978-91-513-0338-3 (ISBN)
Disputation
2018-06-05, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 09:00 (Engelska)
Opponent
Handledare
Forskningsfinansiär
StandUp for Wind
Tillgänglig från: 2018-05-15 Skapad: 2018-04-11 Senast uppdaterad: 2018-10-08

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Mendoza, VictorGoude, Anders

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