Thanasis Barlas
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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: 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: International Energy Agency 22 MW Offshore Reference Wind Turbine
International Energy Agency 22 MW Offshore Reference Wind Turbine Open
The presentation will be used in a public webinar to introduce the newly developed 22 megawatt offshore reference wind turbine designed within the International Energy Agency Wind Technology Commercialization Programme Task 55 Reference Wi…
View article: Development of a machine learning model for wind turbine fatigue and ultimate loads based on static loads
Development of a machine learning model for wind turbine fatigue and ultimate loads based on static loads Open
A machine learning model is trained on HAWC2 time-domain aeroelastic load simulations in order to provide a load surrogate model from static rotor loads input to lifetime wind turbine design loads, to be utilized in fast design loads evalu…
View article: Effects of a Near Wake model on the performance of a Multi-Megawatt wind turbine with an active flap
Effects of a Near Wake model on the performance of a Multi-Megawatt wind turbine with an active flap Open
The impact of including the near wake model in the aeroelastic models of an SWT-DD-120 wind turbine equipped with an active trailing edge flap system (ATEF) is studied. The ATEF installed on this turbine was tested in full scale in a serie…
View article: Aeroelastic code comparison using the IEA 22MW reference turbine
Aeroelastic code comparison using the IEA 22MW reference turbine Open
Reference wind turbine designs and the associated aeroelastic models are widely used in both research and industry. Reference models representing future concepts are of particular interest. Current state of the art aeroelastic tools are re…
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: Definition of the IEA Wind 22-Megawatt Offshore Reference Wind Turbine
Definition of the IEA Wind 22-Megawatt Offshore Reference Wind Turbine Open
This technical report describes the design of a new 22 Megawatt reference wind turbine (RWT). The turbine model was designed collaboratively by two teams at the Denmark Technical University and at the National Renewable Energy Laboratory w…
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: 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: 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: 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: The Hydrogen Wind Turbine: Design of a wind turbine optimised for hydrogen production
The Hydrogen Wind Turbine: Design of a wind turbine optimised for hydrogen production Open
“Green” hydrogen produced using electrolysis and zero-carbon electricity may be a path for the EU to reduce its dependence on natural gas imports and support the green transition. The EU uses 10 Mt of natural gas yearly for hydrogen produc…
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: Open-Source Integrated Wind Farm Control Framework
Open-Source Integrated Wind Farm Control Framework Open
View article: Comparison of aerodynamic models for horizontal axis wind turbine blades accounting for curved tip shapes
Comparison of aerodynamic models for horizontal axis wind turbine blades accounting for curved tip shapes Open
Curved tip extensions are among the rotor innovation concepts that can contribute to the higher performance and lower cost of horizontal axis wind turbines. One of the key drivers to exploit their advantages is the use of accurate and effi…
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: Influence of the installation of a trailing edge flap on the vortex induced vibrations of a wind turbine blade
Influence of the installation of a trailing edge flap on the vortex induced vibrations of a wind turbine blade Open
This work explores the use of a trailing edge flap for the mitigation of the Vortex Induced Vibrations (VIV) of a wind turbine blade in standstill. Fluid structure interaction simulations are performed, coupling a computational fluid dynam…
View article: Comment on wes-2022-35
Comment on wes-2022-35 Open
Abstract. 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…
View article: CFD-based curved tip shape design for wind turbine blades
CFD-based curved tip shape design for wind turbine blades Open
This work presents a high-fidelity shape optimization framework based on computational fluid dynamics (CFD). The presented work is the first comprehensive curved tip shape study of a wind turbine rotor to date using a direct CFD-based appr…
View article: Towards integrated wind farm control: Interfacing farm flow and power plant controls
Towards integrated wind farm control: Interfacing farm flow and power plant controls Open
Concepts for control of wind farms (WFs) can be clustered into two distinct concepts, namely, wind power plant control (WPPC) and wind farm flow control (WFFC). WPPC is concerned with the connection to the power system, compliance with gri…
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: Comparison of different fidelity aerodynamic solvers on the IEA 10 MW turbine including novel tip extension geometries
Comparison of different fidelity aerodynamic solvers on the IEA 10 MW turbine including novel tip extension geometries Open
Lifting-line based solvers could supersede the blade element momentum (BEM) method as the industry standard in the near future as rotor sizes of modern wind turbines and computational resources continue to increase. A comparison study betw…
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: Vibrations of wind turbine blades in standstill: Mapping the influence of the inflow angles
Vibrations of wind turbine blades in standstill: Mapping the influence of the inflow angles Open
The present investigation used numerical simulations to study the vibrations of a wind turbine blade in standstill. Such vibrations are presumed to affect horizontal axis wind turbine designs and can jeopardize the structural integrity of …
View article: Aeroelastic model validation of an Active Trailing Edge Flap System tested on a 4.3 MW wind turbine
Aeroelastic model validation of an Active Trailing Edge Flap System tested on a 4.3 MW wind turbine Open
Active Trailing Edge Flap Systems (ATEFS) have shown promising results on reducing Wind Turbine fatigue and ultimate loads and increasing the Annual Energy Production. However, the current lack of field validation creates uncertainty in th…
View article: Inflow and pressure measurements on a full scale turbine with a pressure belt and a five hole pitot tube
Inflow and pressure measurements on a full scale turbine with a pressure belt and a five hole pitot tube Open
We present an autonomous add-on measurement system for detailed aerodynamic measurements on full scale turbines. From the measured data we can derive the local aerodynamic coefficients for the blade section and e.g. compare with wind tunne…
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 transitioning…