Concept

Winglet

Publications associées (57)

Model based power optimisation of wind farms

We present a framework for maximising the power output of a wind farm considering wake effects. A parameter representing the total power coefficient of a wind farm is introduced, which quantifies the wind speed deficit due to wake. For any given wake model ...

IEEE2014

Gust Load Alleviation Based on Model Predictive Control

Timm Faulwasser, Michael Köpf

Weight reduction is a typical design goal for modern aircraft. If gust encoun- ters (as required by Certification Specification 25) are sizing conditions of parts of the airframe, this can be achieved (for example) by an active gust load alleviation system ...

2013

Wind-Turbine Wakes in a Convective Boundary Layer: A Wind-Tunnel Study

Fernando Porté Agel, Wei Zhang, Corey Dean Markfort

Thermal stability changes the properties of the turbulent atmospheric boundary layer, and in turn affects the behaviour of wind-turbine wakes. To better understand the effects of thermal stability on the wind-turbine wake structure, wind-tunnel experiments ...

Springer Netherlands2013

Model Predictive Control for Gust Load Alleviation

Timm Faulwasser, Michael Köpf

For economical and ecological reasons aircraft are required to become more efficient by reducing fuel consumption and CO

_2

emissions. One way to achieve these objectives is to decrease the weight of the aircraft structure. The reduction is, however, limi ...

2012

Characterisation of blade tip vortices by simultaneous time-resolved velocity and density field measurements

Karen Ann J Mulleners

The flow field around a helicopter is dominated by strong coherent vortices originating from the blade tip as a result of the pressure difference between suction and pressure side and a high radial velocity at the tip (Leishman, 2001; Green and Acosta, 199 ...

2012

Atmospheric Turbulence Effects on Wind-Turbine Wakes: An LES Study

Fernando Porté Agel, Yu-Ting Wu

A numerical study of atmospheric turbulence effects on wind-turbine wakes is presented. Large-eddy simulations of neutrally-stratified atmospheric boundary layer flows through stand-alone wind turbines were performed over homogeneous flat surfaces with fou ...

Mdpi Ag2012

Numerical capture of wing tip vortex improved by mesh adaptation

François Avellan, Olivier Braun, Eric Joubarne

This paper presents a mesh adaptation procedure linked to a finite volume solver, the goal of which is to increase the precision of the numerical simulation of a wing tip vortex flow. The adaptation scheme is applied to hexahedron meshes and hybrid meshes ...

2011

Aperiodicity in the near field of full-scale rotor blade tip vortices

Karen Ann J Mulleners, Kolja Kindler

Blade tip vortices are the dominant vortical structures of the helicopter flow field. The inherent complexity of the vortex dynamics has led to an increasing interest in full-scale in situ experiments, where the near field, closely behind the blade, is of ...

2011

Turbulent Flow Inside and Above aWind Farm: A Wind-Tunnel Study

Fernando Porté Agel

Wind-tunnel experiments were carried out to better understand boundary layer effects on the flow pattern inside and above a model wind farm under thermally neutral conditions. Cross-wire anemometry was used to characterize the turbulent flow structure at d ...

2011

Large-Eddy Simulation of Wind-Turbine Wakes: Evaluation of Turbine Parametrisations

Fernando Porté Agel, Yu-Ting Wu

Large-eddy simulation (LES), coupled with a wind-turbine model, is used to investigate the characteristics of a wind-turbine wake in a neutral turbulent boundary-layer flow. The tuning-free Lagrangian scale-dependent dynamic subgrid-scale (SGS) model is us ...

Springer Netherlands2011

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Model Predictive Control for Gust Load Alleviation

Timm Faulwasser, Michael Köpf

For economical and ecological reasons aircraft are required to become more efficient by reducing fuel consumption and CO

_2

emissions. One way to achieve these objectives is to decrease the weight of the aircraft structure. The reduction is, however, limi ...

2012