Helge Aagaard Madsen
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View article: Blade surface pressure and drag measurement of a blade section on a 4.3 MW turbine with trailing-edge flaps
Blade surface pressure and drag measurement of a blade section on a 4.3 MW turbine with trailing-edge flaps Open
In this paper we present the measurements of local aerodynamic sectional characteristics on a full-scale rotor blade with a novel add-on instrumentation comprising a wake rake, a pressure belt, and a five-hole Pitot tube. The general objec…
View article: Detailed experimental investigation of the aerodynamics and blade/tower interaction of a 1.5 MW wind turbine in a downwind configuration
Detailed experimental investigation of the aerodynamics and blade/tower interaction of a 1.5 MW wind turbine in a downwind configuration Open
We present a detailed experimental investigation of the flow details of the blade/tower interaction on a 1.5 MW wind turbine operated in a downwind configuration. The study aims to address claims of shortcomings in the downwind turbine con…
View article: Comparison of three DWM-based wake models at below-rated wind speeds
Comparison of three DWM-based wake models at below-rated wind speeds Open
Wind turbine wake models are essential tools for predicting power losses and structural loads in wind farms. Among them, the dynamic wake meandering (DWM) model, included as a recommended approach in the International Electrotechnical Comm…
View article: Reply on RC1
Reply on RC1 Open
View article: Reply on RC2
Reply on RC2 Open
View article: Reply on RC3
Reply on RC3 Open
View article: Blade surface pressure and drag measurement of a blade section on a 4.3 MW turbine with trailing edge flaps
Blade surface pressure and drag measurement of a blade section on a 4.3 MW turbine with trailing edge flaps Open
In this paper we present the measurements of local aerodynamic sectional characteristics on a full-scale rotor blade with a novel add-on instrumentation comprising a wake rake, a pressure belt, and a five hole Pitot tube. The general objec…
View article: Exploration of an analytical, linear two-dimensional actuator disc model as basis for a general rotor induction model
Exploration of an analytical, linear two-dimensional actuator disc model as basis for a general rotor induction model Open
The state of the art BEM based aerodynamic and aeroelastic modelling is challenged by effects rising from the upscaling of wind turbine rotors such as non-planar rotor shapes due to increased blade bending and large instantaneous load vari…
View article: Challenges in Rotor Aerodynamic Modeling for Non-Uniform Inflow Conditions
Challenges in Rotor Aerodynamic Modeling for Non-Uniform Inflow Conditions Open
Within an international collaboration framework, the accuracy of rotor aerodynamic models used for design load calculations of wind turbines is being assessed. Where the use of high-fidelity computation fluid dynamics (CFD) and mid-fidelit…
View article: Validation of aeroelastic dynamic model of active trailing edge flap system tested on a 4.3 MW wind turbine
Validation of aeroelastic dynamic model of active trailing edge flap system tested on a 4.3 MW wind turbine Open
Active trailing edge flap (ATEF) is a promising technology for controlling wind turbine loads and enhancing energy production. The integration of this technology in the design of commercial wind turbines requires dedicated flap aeroelastic…
View article: Incorporating Electricity Prices in Wind Turbine Design: Introducing the AEV Metric
Incorporating Electricity Prices in Wind Turbine Design: Introducing the AEV Metric Open
This paper addresses the challenge of incorporating electricity prices into wind turbine design methods and shows how price volatility drives wind turbines towards larger rotors and lower specific power. Since wind speed and electricity pr…
View article: An analytical linear two-dimensional actuator disc model and comparisons with computational fluid dynamics (CFD) simulations
An analytical linear two-dimensional actuator disc model and comparisons with computational fluid dynamics (CFD) simulations Open
The continuous up-scaling of wind turbines enabled by more lightweight and flexible blades in combination with coning has challenged the assumptions of a plane disc in the commonly used blade element momentum (BEM)-type aerodynamic codes f…
View article: Comment on wes-2023-63
Comment on wes-2023-63 Open
Abstract. Active Trailing Edge Flap (ATEF) is a promising technology for Wind Turbine load reduction and AEP improvement. However, this technology still needs extensive field validations to prove the reliability of the ATE…
View article: Reply on RC2
Reply on RC2 Open
Abstract. We present an analytical, linear solution for a two dimensional (2-D) actuator disc (AD) flow with one equation for the axial velocity and for the lateral velocity, respectively. Although it is a 2-D model we sho…
View article: Reply on RC1
Reply on RC1 Open
Abstract. We present an analytical, linear solution for a two dimensional (2-D) actuator disc (AD) flow with one equation for the axial velocity and for the lateral velocity, respectively. Although it is a 2-D model we sho…
View article: Validation of aeroelastic dynamic model of Active Trailing Edge Flap system tested on a 4.3 MW wind turbine
Validation of aeroelastic dynamic model of Active Trailing Edge Flap system tested on a 4.3 MW wind turbine Open
Active Trailing Edge Flap (ATEF) is a promising technology for Wind Turbine load reduction and AEP improvement. However, this technology still needs extensive field validations to prove the reliability of the ATEF aeroelastic modeling code…
View article: An analytical linear two-dimensional Actuator Disc Model and comparisons with CFD simulations
An analytical linear two-dimensional Actuator Disc Model and comparisons with CFD simulations Open
We present an analytical, linear solution for a two dimensional (2-D) actuator disc (AD) flow with one equation for the axial velocity and for the lateral velocity, respectively. Although it is a 2-D model we show in the paper that there i…
View article: Grand challenges in the design, manufacture, and operation of future wind turbine systems
Grand challenges in the design, manufacture, and operation of future wind turbine systems Open
Wind energy is foundational for achieving 100 % renewable electricity production, and significant innovation is required as the grid expands and accommodates hybrid plant systems, energy-intensive products such as fuels, and a transitionin…
View article: Comparison of three DWM-based wake models at above-rated wind speeds
Comparison of three DWM-based wake models at above-rated wind speeds Open
In this study we investigate three mid-fidelity wind turbine wake models based on the dynamic wake meandering (DWM) model principle, and compare their performance with a reference dataset, produced with large-eddy simulations using the act…
View article: On the laminar–turbulent transition mechanism on megawatt wind turbine blades operating in atmospheric flow
On the laminar–turbulent transition mechanism on megawatt wind turbine blades operating in atmospheric flow Open
Among a few field experiments on wind turbines for analyzing laminar–turbulent boundary layer transition, the results obtained from the DAN-AERO and aerodynamic glove projects provide significant findings. The effect of inflow turbulence o…
View article: Progress in the validation of rotor aerodynamic codes using field data
Progress in the validation of rotor aerodynamic codes using field data Open
Within the framework of the fourth phase of the International Energy Agency (IEA) Wind Task 29, a large comparison exercise between measurements and aeroelastic simulations has been carried out featuring three simulation cases in axial, sh…
View article: OPERATIONAL EXPERIENCE DURING A FOUR YEAR TEST PROGRAM OF ACTIVE FLAPS ON A WIND TURBINE BLADE
OPERATIONAL EXPERIENCE DURING A FOUR YEAR TEST PROGRAM OF ACTIVE FLAPS ON A WIND TURBINE BLADE Open
A prototype of a pneumatically controlled active flap system (AFS) for wind turbine blades was designed and manufactured as a part of the collaboration projects Induflap2 and VIAs between the partners Siemens Gamesa Renewable Energy, DTU W…
View article: Comment on wes-2022-32
Comment on wes-2022-32 Open
Abstract. Wind energy is foundational for achieving 100 % renewable electricity production and significant innovation is required as the grid expands and accommodates hybrid plant systems, energy-intensive products such as…
View article: Atmospheric rotating rig testing of a swept blade tip and comparison with multi-fidelity aeroelastic simulations
Atmospheric rotating rig testing of a swept blade tip and comparison with multi-fidelity aeroelastic simulations Open
One promising design solution for increasing the energy production of modern horizontal axis wind turbines is the installation of curved tip extensions. However, since the aeroelastic response of such geometrical add-ons has not been chara…
View article: Progress in validation of rotor aerodynamic codes using field data
Progress in validation of rotor aerodynamic codes using field data Open
Within the framework of the fourth phase of International Energy Agency IEA Wind Task 29, a large comparison exercise between measurements and aero-elastic simulations has been carried out featuring three simulation cases in axial, sheared…
View article: Comment on wes-2022-13
Comment on wes-2022-13 Open
Abstract. Accurate modeling of the dynamic stall remains a challenge for the design and construction of turbine blades and helicopter rotors. At the same time, wind turbines, for instance, are becoming steadily larger, fur…
View article: On the laminar-turbulent transition mechanism on Multi-Megawatt wind turbine blades operating in atmospheric flow
On the laminar-turbulent transition mechanism on Multi-Megawatt wind turbine blades operating in atmospheric flow Open
Among a few field experiments on wind turbines for analyzing laminar-turbulent boundary layer transition, the results obtained from the DAN-AERO and aerodynamic Glove projects provide significant findings. The effect of inflow turbulence o…
View article: Atmospheric rotating rig testing of a swept blade tip and comparison with multi-fidelity aeroelastic simulations
Atmospheric rotating rig testing of a swept blade tip and comparison with multi-fidelity aeroelastic simulations Open
One promising design solution for increasing the energy production of modern horizontal axis wind turbines is the installation of curved tip extensions. However, since the aeroelastic response of such geometrical add-ons has not been chara…
View article: Test of an active flap system on a 4.3 MW wind turbine
Test of an active flap system on a 4.3 MW wind turbine Open
This article describes a field test performed on a 4.3 MW wind turbine with one blade equipped with an active flap system. The results presented focus primarily on the steady state and periodic characterization of the active flap system in…
View article: Characterization of a Fast Response Probe for Inflow Turbulence Measurements on Wind Turbine Blades
Characterization of a Fast Response Probe for Inflow Turbulence Measurements on Wind Turbine Blades Open
The performance of a wind turbine, its aerodynamic and acoustic predictions, and expected power output are affected by atmospheric turbulence. Previous studies showed that the installation of high-frequency measurement devices on blades is…