- document
-
Savenije, L.B. (author), Ashuri, T. (author), Van Bussel, G.J.W. (author), Staerdahl, J.W. (author)The installation of floating wind farms in deeper water is encouraged by the stronger and steadier wind, the lower visibility and noise impact, the absence of road restrictions, but also the absence or shortage of shallow water. In the summer of 2009, the first large-scale floating wind turbine ”Hywind” was installed. Hywind is a spar-buoy...conference paper 2010
- document
-
Micallef, D. (author), Simao Ferreira, C.J. (author), Sant, T. (author), Van Bussel, G.J.W. (author)The main motivation behind this work is to create a purely analytical engineering model for wind turbine wake upward deflection due to shear flow, by developing a closed form solution of the velocity field due to an oblique vortex ring. The effectiveness of the model is evaluated by comparing the results with those of a free-wake model. The...conference paper 2010
- document
-
Ashuri, T. (author), Van Bussel, G.J.W. (author), Zaayer, M.B. (author), Van Kuik, G.A.M. (author)The purpose of this paper is to integrate the controller design of wind turbines with structure and aerodynamic analysis and use the final product in the design optimization process (DOP) of wind turbines. To do that, the controller design is automated and integrated with an aeroelastic simulation tool. This integrated tool is linked with an...conference paper 2010
- document
-
Akay, B. (author), Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author), Tescione, G. (author)A detailed quantitative description of the aerodynamics of a horizontal axis wind turbine (HAWT) is difficult due to complexity of the flow field. Several methods from experimental to analytical are used to investigate the aerodynamics of a HAWT. In the present study, a wind tunnel experiment and computational fluid dynamics (CFD) simulations...conference paper 2010
- document
-
Ashuri, T. (author), Van Bussel, G.J.W. (author), Zaayer, M.B. (author), Van Kuik, G.A.M. (author)A wind turbine blade has a complex shape and consists of different elements with dissimilar material properties. To do any aeroelastic simulation, the structural properties of the blade such as stiffnesses and mass per unit length should be known in advance, and extracting these properties is a difficult task. This paper presents an analytical...conference paper 2010
- document
-
Micallef, D. (author), Akay, B. (author), Sant, T. (author), Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author)The scope of this work was to investigate radial flow component for a Horizontal Axis Wind Turbine in axial flow conditions and to assess its impact on the turbine operation. This was done by means of Particle Image Velocimetry and numerical simulation with a 3D unsteady potential-flow panel model. A direct comparison between the numerical and...conference paper 2011
- document
-
Castillo Capponi, P. (author), Van Bussel, G.J.W. (author), Ashuri, T. (author), Kallesoe, B. (author)The linear scaling laws for upscaling wind turbine blades show a linear increase of stresses due to the weight. However, the stresses should remain the same for a suitable design. Application of linear scaling laws may lead to an upscaled blade that may not be any more a feasible design. In this paper a non-linear upscaling approach is presented...conference paper 2011
- document
-
Hofemann, C. (author), Van Bussel, G.J.W. (author), Veldkamp, H. (author)If at least one reference wind turbine is available, which provides sufficient information about the wind turbine loads, the loads acting on the neighbouring wind turbines can be predicted via an artificial neural network (ANN). This research explores the possibilities to apply such a network not only within a wind park but on turbines located...conference paper 2011
- document
-
Akay, B. (author), Micallef, D. (author), Ferreira, C.S. (author), Van Bussel, G.J.W. (author)This paper sets out to describe the measurements and computations to construct three components of velocity field around the blade. The primary aim of the measurements was to gain insight into the physics of the flow field produced by a horizontal axis wind turbine-HAWT blade. Stereo Particle Image Velocimetry experiments were performed on a two...conference paper 2011
- document
-
Akay, B. (author), Ferreira, C.S. (author), Van Bussel, G.J.W. (author), Herraez, I. (author)This paper explores the evolution of radial flow in a Horizontal Axis Wind Turbine (HAWT) blade root region. The radial flow is analyzed in the potential flow and viscous flow regions. An experiment carried out by means of stereo Particle Image Velocimetry to measure the velocity field produced by a HAWT blade. While the radial flow in the...conference paper 2012
- document
-
Van der Meulen, M.B. (author), Ashuri, T. (author), Van Bussel, G.J.W. (author), Molenaar, D.P. (author)In order to make offshore wind power a cost effective solution that can compete with the traditional fossil energy sources, cost reductions on the expensive offshore support structures are required. One way to achieve this, is to reduce the uncertainty in wave load calculations by using a more advanced model for wave kinematics. As offshore wind...conference paper 2012
- document
-
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
- document
- Baldacchino, D. (author), Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author) conference paper 2014
- document
- Giyanani, A.H. (author), Bierbooms, W.A.A.M. (author), Van Bussel, G.J.W. (author) conference paper 2014
- document
-
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
- document
-
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
- document
-
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
- document
- Van Heemst, J.W. (author), Baldacchino, D. (author), Mehta, D. (author), Van Bussel, G.J.W. (author) journal article 2014
- document
-
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
- document
-
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