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- Echavarria, E. (author), Tomiyama, T. (author), Van Bussel, G.J.W. (author) journal article 2007
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- Van Bussel, G.J.W. (author) journal article 2007
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- Simao Ferreira, C.J. (author), van Kuik, G.A.M. (author), van Bussel, G.J.W. (author), Scarano, F. (author) journal article 2008
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- Sant, A. (author), Van Kuik, G.A.M. (author), Van Bussel, G.J.W. (author) journal article 2008
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Holtslag, M.C. (author), Bierbooms, W.A.A.M. (author), Van Bussel, G.J.W. (author)In this paper the dependence of wind turbine fatigue loads on atmospheric stability is assessed. It is shown that fatigue loads depend strongly on stability, and highest loads occur for very unstable conditions. For a given hub height wind speed one can dene an equivalent atmospheric stability that corresponds to the same cumulative loads as if...journal article 2014
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Holtslag, M.C. (author), Bierbooms, W.A.A.M. (author), Van Bussel, G.J.W. (author)Atmospheric stability strongly influences wind shear and thus has to be considered when performing load calculations for wind turbine design. Numerous methods exist however for obtaining stability in terms of the Obukhov length L as well as for correcting the logarithmic wind profile. It is therefore questioned to what extend the choice of...journal article 2014
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Akay, B. (author), Micallef, D. (author), Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author)In this study, the effect of the parameters playing a role in the root flow behavior of HAWT are only partly understood. To better reveal the root flow properties, this study presents the progression of HAWT blade root flow at two different blade geometries and at two different tip speed ratios. The effects of the geometry and the tip speed...journal article 2014
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Pereira, R. (author), Van Bussel, G.J.W. (author), Timmer, W.A. (author)The increasing size of Horizontal Axis Wind Turbines and the trend to install wind farms further offshore demand more robust design options. If the pitch system could be eliminated, the availability of Horizontal Axis Wind Turbines should increase. This research investigates the use of active stall control to regulate power production in...journal article 2014
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- Van Heemst, J.W. (author), Baldacchino, D. (author), Mehta, D. (author), Van Bussel, G.J.W. (author) journal article 2014
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Baldacchino, D. (author), Van Bussel, G.J.W. (author)In the present study, a simple inviscid vortex ring (VR) modelling approach is used to represent the developing rotor wake. This allows a straightforward investigation and comparison of the impact of uniform, yawed and sheared flow conditions on the development of the rotor wake, with the additional possibility of including ground effect. The...journal article 2014
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Micallef, D. (author), Akay, B. (author), Simao Ferreira, C.J. (author), Sant, T. (author), Van Bussel, G.J.W. (author)The tip vortex of a wind turbine rotor blade originates as a result of a complex distribution of vorticity along the blade tip thickness. While the tip vortex evolution was extensively studied previously in other work, the mechanism of the initiation of the tip vorticity in a 3D rotating environment is still somewhat obscured due to lack of...journal article 2014
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Giyanani, A.H. (author), Bierbooms, W.A.A.M. (author), Van Bussel, G.J.W. (author)Remote sensing of the atmospheric variables with the use of Lidar is a relatively new technology field for wind resource assessment in wind energy. A review of the draft version of an international guideline (CD IEC 61400-12-1 Ed.2) used for wind energy purposes is performed and some extra atmospheric variables are taken into account for proper...journal article 2015
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Dighe, V.V. (author), Avallone, F. (author), van Bussel, G.J.W. (author)In this paper, a computational approach, based on the solution of Reynolds-averaged-Navier–Stokes (RANS) equations, to describe the flow within and around a diffuser augmented wind turbine (DAWT) is reported. In order to reduce the computational cost, the turbine is modeled as an actuator disc (AD) that imposes a resistance to the passage of the...journal article 2016
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Baldacchino, D. (author), Ferreira, Carlos (author), Ragni, D. (author), van Bussel, G.J.W. (author)In this work, we present a simple inviscid point vortex model to study the dynamics of asymmetric vortex rows, as might appear behind misaligned vortex generator vanes. Starting from the existing solution of the in_nite vortex cascade, a numerical model of four base-vortices is chosen to represent two primary counter-rotating vortex pairs and...journal article 2016
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Giyanani, A.H. (author), Bierbooms, W.A.A.M. (author), van Bussel, G.J.W. (author)Lidars have become increasingly useful for providing accurate wind speed measurements in front of the wind turbine. The wind field measured at distant meteorological masts changes its structure or was too distorted before it reaches the turbine. Thus, one cannot simply apply Taylor's frozen turbulence for representing this distant flow field at...journal article 2016
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De Oliveira Andrade, G.L. (author), Balbino dos Santos Pereira, R. (author), Ragni, D. (author), Avallone, F. (author), van Bussel, G.J.W. (author)The article seeks to unify the treatment of conservative force interactions between axi-symmetric bodies and actuators in inviscid ow. Applications include the study of hub interference, di_user augmented wind turbines and boundary layer ingestion propeller con_gurations. The conservation equations are integrated over in_nitesimal streamtubes to...journal article 2016
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Tang, J. (author), Avallone, F. (author), van Bussel, G.J.W. (author)This study presents an experimental investigation on a diffuser augmented wind turbine (DAWT). A screen mesh is used to simulate the energy extraction mechanisms of a wind turbine in experiment. Different screen porosities corresponding to different turbine loading coefficients are tested. Measurements of the axial force and of the velocity...journal article 2016
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Lignarolo, L. (author), Ragni, D. (author), Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author)The actuator disc (AD) model is commonly used to simplify the simulation of horizontal-axis wind-turbine aerodynamics. The limitations of this approach in reproducing the wake losses in wind farm simulations have been proven by a previous research. The present study is aimed at providing an experimental analysis of the near-wake turbulent flow...journal article 2016
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Zhang, Y. (author), Gillebaart, T. (author), van Zuijlen, A.H. (author), van Bussel, G.J.W. (author), Bijl, H. (author)This paper presents the experimental and numerical study on MEXICO wind turbine blades. Previous work by other researchers shows that large deviations exist in the loads comparison between numerical predictions and experimental data for the rotating MEXICO wind turbine. To reduce complexities and uncertainties, a non-rotating experimental...journal article 2017
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Zhang, Y. (author), van Zuijlen, A.H. (author), van Bussel, G.J.W. (author)This paper aims to provide an explanation for the overprediction of aerodynamic loads by CFD compared to experiments for the MEXICO wind turbine rotor and improve the CFD prediction by considering laminar-turbulent transition modeling. Large deviations between CFD results and experimental measurements are observed in terms of sectional normal...journal article 2017