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Berdowski, T.J. (author), Ferreira, Carlos (author), van Zuijlen, A.H. (author), van Bussel, G.J.W. (author)A PhD project is being carried out on the topic of far-wake aerodynamics of Horizontal Axis Wind Turbines (HAWTs) in yawed conditions, which has a large relevance for wind farm design and optimization. Characteristic for a turbine in yaw are the inherent unsteady and non-uniform rotor loading, and the typical wake deflection and strong three...abstract 2017
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De Oliveira Andrade, G.L. (author), Balbino dos Santos Pereira, R. (author), van Bussel, G.J.W. (author), Avallone, F. (author), Ragni, D. (author)Flow augmentation consists in modifying mass flow across the actuation plane of a rotor to enhance energy extraction or propulsive efficiency. The talk sketches the distinction between passive and active rotor augmentation strategies. Power coefficient trends are compared analytically while numerical results illustrate differences in flow...abstract 2017
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Dighe, V.V. (author), De Oliveira Andrade, G.L. (author), van Bussel, G.J.W. (author)The practice of ducting wind turbines has shown a beneficial effect on the overall performance, when compared to an open turbine of the same rotor diameter1. However, an optimization study specifically for ducted wind turbines (DWT’s) is missing or incomplete. This work focuses on a numerical optimization of the duct orientation and the ideal...abstract 2017
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Tang, J. (author), van Bussel, G.J.W. (author)A new high-lift aerofoil modification for the duct has been developed and will be experimentally tested in a small wind tunnel. Aerofoils for such wind tunnel ducts typically operate in the low Reynolds number range from 2 × 105 to 6 × 105. The effect of a duct and of rotor on power and pressure drop were considered separately in previous...abstract 2017
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Lignarolo, L. (author), Ragni, D. (author), Simao Ferreira, C.J. (author), van Bussel, G.J.W. (author)The present paper is the summary of 3 years of research on the wake aerodynamics of horizontal axis wind turbine at Delft University of Technology, the Netherlands. In particular, the main results and the conclusions of two experimental campaigns are collected. The underlying research question is: how do the near-wake turbulent flow structures...conference paper 2015
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Dighe, V.V. (author), Suri, Dhruv (author), Avallone, F. (author), van Bussel, G.J.W. (author)Ducted Wind Turbines (DWTs) are used for energy harvesting in urban areas where the flow is non-uniform in comparison to the free-field because of the presence of buildings or other surface discontinuities. For this reason, the aerodynamic performance and far-field noise of DWTs in yawed inflow conditions must be characterized. Both the...conference paper 2020
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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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Dighe, V.V. (author), Suri, Dhruv (author), Avallone, F. (author), van Bussel, G.J.W. (author)Ducted wind turbines (DWTs) can be used for energy harvesting in urban areas where non-uniform flows are caused by the presence of buildings or other surface discontinuities. For this reason, the aerodynamic performance of DWTs in yawed-flow conditions must be characterized depending upon their geometric parameters and operating conditions. A...journal article 2021
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Chrysochoidis-Antsos, N. (author), van Bussel, G.J.W. (author), Bozelie, Jan (author), Mertens, Sander M. (author), van Wijk, A.J.M. (author)Micro wind turbines can be structurally integrated on top of the solid base of noise barriers near highways. A number of performance factors were assessed with holistic experiments in wind tunnel and in the field. The wind turbines underperformed when exposed in yawed flow conditions. The theoretical cosθ theories for yaw misalignment did not...journal article 2021
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Dong, J. (author), Viré, A.C. (author), Ferreira, Carlos (author), Li, Zhangrui (author), van Bussel, G.J.W. (author)A modified free-wake vortex ring model is proposed to compute the dynamics of a floating horizontal-axis wind turbine, which is divided into two parts. The near wake model uses a blade bound vortex model and trailed vortex model, which is developed based on vortex filament method with straight lifting lines assumption. By contrast, the far wake...journal article 2019
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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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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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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
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Baldacchino, D. (author), Ferreira, Carlos (author), De Tavernier, D. (author), Timmer, W.A. (author), van Bussel, G.J.W. (author)Passive vane-type vortex generators (VGs) are commonly used on wind turbine blades to mitigate the effects of flow separation. However, significant uncertainty surrounds VG design guidelines. Understanding the influence of VG parameters on airfoil performance requires a systematic approach targeting wind energy-specific airfoils. Thus, the 30...journal article 2018
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Tang, J. (author), Avallone, F. (author), Bontempo, R. (author), van Bussel, G.J.W. (author), Manna, M. (author)This paper reports an experimental investigation on the effect of the duct geometry on the aerodynamic performance of an aerofoil shaped ducted wind turbine (DWT). The tested two-dimensional model is composed of an aerofoil equipped with pressure taps and a uniform porous screen. The experimental setup is based on the assumption that the duct...journal article 2018
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Dighe, V.V. (author), De Oliveira Andrade, G.L. (author), Avallone, F. (author), van Bussel, G.J.W. (author)This paper aims to study the aerodynamic performance of ducted wind turbines (DWT) using inviscid and viscous flow calculations by accounting for the mutual interaction between the duct and the rotor. Two generalized duct cross section geometries are considered while the rotor is modelled as an actuator disc with constant thrust coefficient....journal article 2018
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