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Validation of the actuator disc approach using small-scale model wind turbines
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
2017 (English)In: Wind Energy Science, ISSN 2213-3968, E-ISSN 2366-7443, Vol. 2, p. 587-601Article in journal (Refereed) Published
Abstract [en]

The aim of the present study is the validation of the implementation of an actuator disc (ACD) model in the computational fluid dynamics (CFD) code PHOENICS. The flow behaviour for three wind turbine cases is investigated numerically and compared to wind tunnel measurements: (A) the flow around a single model wind turbine, (B) the wake interaction between two in-line model wind turbines for a uniform inflow of low turbulence intensity and (C) the wake interaction between two in-line model wind turbines at different separation distances in a uniform or sheared inflow of high turbulence intensity. This is carried out using Reynolds-averaged Navier–Stokes (RANS) simulations and an ACD technique in the CFD code PHOENICS. The computations are conducted for the design condition of the rotors using four different turbulence closure models and five different thrust distributions. The computed axial velocity field as well as the turbulence kinetic energy are compared with hot-wire anemometry (HWA) measurements. For the cases with two in-line wind turbines, the thrust coefficient is also computed and compared with measurements. The results show that for different inflow conditions and wind turbine spacings the proposed method is able to predict the overall behaviour of the flow with low computational effort. When using the k-ε and Kato–Launder k-ε turbulence models the results are generally in closer agreement with the measurements.

Place, publisher, year, edition, pages
2017. Vol. 2, p. 587-601
National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:uu:diva-338124DOI: 10.5194/wes-2-587-2017ISI: 000416160500001OAI: oai:DiVA.org:uu-338124DiVA, id: diva2:1171445
Available from: 2018-01-08 Created: 2018-01-08 Last updated: 2018-05-03Bibliographically approved
In thesis
1. Wind power wake modelling: Development and application of an actuator disc method for industrial utilization.
Open this publication in new window or tab >>Wind power wake modelling: Development and application of an actuator disc method for industrial utilization.
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

As a wind turbine extracts energy from the wind it creates a region downstream where the wind velocity is decreased and the urbulence intensity is increased, this region is commonly called the wake region. Today’s wind farms include a large number of wind turbines position in tight layouts. These tight layouts result in increased power losses due to wakes, rendering accurate wind turbine wake modelling crucial in developing cost effective projects.

The primary aim of this study is to create a method capable of conducting full-scale wind farm wake computations accurately in a time efficient manner by taking into account the computational resources and data availability of a typical industrial user. As a first step of this study, an actuator disc (ACD) method (old ACD) used within WindSim, is evaluated against power production data from the Lillgrund offshore wind. This study is followed by the development of a new ACD method. The new ACD method differs from the previous ACD method in terms of how the thrust distribution and the power production is calculated. A series of validation studies are performed on this newly introduced ACD method. These consist of validating the method against two cases with known analytical solutions, the research code EllipSys3D which uses Large Eddy Simulation (LES) based computations with an ACD approach and three differentwind tunnel set–ups. Lastly, a comparative analysis of the two ACD methods (old and new) and two analytical wake models is done using wind turbine power production data from Lillgrund.

Results from the validation studies show that this new ACD method is able to predict the overall behaviour of the flow with low computational effort while also taking into account the availability of data for a typical industrial user. One may say that the new ACD method in RANS, which has much lower computational requirements than the ACD method in LES at the cost of lower accuracy, represents a good compromise. Lastly, the results from the new ACD method show a clear improvement in the estimated power production for the Lillgrund wind farm in comparison to the old ACD method.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 50
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1680
Keywords
Wind power, Offshore wind farm, Wakes, Actuator Disc Method (ACD), Computational Fluid Dynamics (CFD), Reynolds Average Navier–Stokes (RANS), WindSim, PHOENICS
National Category
Earth and Related Environmental Sciences
Identifiers
urn:nbn:se:uu:diva-350028 (URN)978-91-513-0357-4 (ISBN)
Public defence
2018-09-12, E22, Campus Gotland, Cramérgatan 3, Visby, 10:15 (English)
Opponent
Supervisors
Available from: 2018-06-13 Created: 2018-05-03 Last updated: 2018-09-27

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