Comparison of aerodynamic models for horizontal axis wind turbine blades accounting for curved tip shapes
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 efficient computational aerodynamic models during the design stag...
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| Veröffentlicht in: | Wind energy (Chichester, England) Jg. 26; H. 1; S. 5 - 22 |
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| Format: | Journal Article |
| Sprache: | Englisch |
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Bognor Regis
John Wiley & Sons, Inc
01.01.2023
Wiley |
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| ISSN: | 1095-4244, 1099-1824 |
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| Abstract | 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 efficient computational aerodynamic models during the design stage. The present work gives an overview of the performance of different state‐of‐the‐art models. The following tools were employed, in descending order of complexity: (i) a blade‐resolved Navier Stokes solver, (ii) a lifting line model, (iii) a vortex‐based method coupling a near‐wake model with a far‐wake model, and (iv) two implementations of the widely used blade element momentum method (BEM), with and without radial induction. The predictions of the codes were compared when simulating the baseline geometry of a reference wind turbine and different tip extension designs with relatively large sweep angle and/or dihedral angle. Four load cases were selected for this comparison, to cover several aspects of the aerodynamic modeling: steady power curve, pitch step, extreme operating gust impact, and standstill in deep stall. The present study highlighted the limitations of the BEM‐based formulations to capture the trends attributed to the introduction of curvature at the tip. This was true even when using the radial induction submodel. The rest of the computational methods showed relatively good agreement in most of the studied load cases. An exception to this was the standstill configuration, as the blade‐resolved Navier‐Stokes solver was the only code able to capture the highly unsteady effects of deep stall. |
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| AbstractList | 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 efficient computational aerodynamic models during the design stage. The present work gives an overview of the performance of different state‐of‐the‐art models. The following tools were employed, in descending order of complexity: (i) a blade‐resolved Navier Stokes solver, (ii) a lifting line model, (iii) a vortex‐based method coupling a near‐wake model with a far‐wake model, and (iv) two implementations of the widely used blade element momentum method (BEM), with and without radial induction. The predictions of the codes were compared when simulating the baseline geometry of a reference wind turbine and different tip extension designs with relatively large sweep angle and/or dihedral angle. Four load cases were selected for this comparison, to cover several aspects of the aerodynamic modeling: steady power curve, pitch step, extreme operating gust impact, and standstill in deep stall. The present study highlighted the limitations of the BEM‐based formulations to capture the trends attributed to the introduction of curvature at the tip. This was true even when using the radial induction submodel. The rest of the computational methods showed relatively good agreement in most of the studied load cases. An exception to this was the standstill configuration, as the blade‐resolved Navier‐Stokes solver was the only code able to capture the highly unsteady effects of deep stall. Abstract 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 efficient computational aerodynamic models during the design stage. The present work gives an overview of the performance of different state‐of‐the‐art models. The following tools were employed, in descending order of complexity: (i) a blade‐resolved Navier Stokes solver, (ii) a lifting line model, (iii) a vortex‐based method coupling a near‐wake model with a far‐wake model, and (iv) two implementations of the widely used blade element momentum method (BEM), with and without radial induction. The predictions of the codes were compared when simulating the baseline geometry of a reference wind turbine and different tip extension designs with relatively large sweep angle and/or dihedral angle. Four load cases were selected for this comparison, to cover several aspects of the aerodynamic modeling: steady power curve, pitch step, extreme operating gust impact, and standstill in deep stall. The present study highlighted the limitations of the BEM‐based formulations to capture the trends attributed to the introduction of curvature at the tip. This was true even when using the radial induction submodel. The rest of the computational methods showed relatively good agreement in most of the studied load cases. An exception to this was the standstill configuration, as the blade‐resolved Navier‐Stokes solver was the only code able to capture the highly unsteady effects of deep stall. |
| Author | Barlas, Thanasis Li, Ang Pirrung, Georg Horcas, Sergio González Ramos‐García, Néstor |
| Author_xml | – sequence: 1 givenname: Sergio González orcidid: 0000-0002-4034-3118 surname: Horcas fullname: Horcas, Sergio González email: sgonzalez@cimne.upc.edu organization: Technical University of Denmark (DTU) – sequence: 2 givenname: Néstor orcidid: 0000-0002-8326-2174 surname: Ramos‐García fullname: Ramos‐García, Néstor email: nerga@dtu.dk organization: Technical University of Denmark (DTU) – sequence: 3 givenname: Ang orcidid: 0000-0001-7313-8308 surname: Li fullname: Li, Ang email: angl@dtu.dk organization: Technical University of Denmark (DTU) – sequence: 4 givenname: Georg orcidid: 0000-0001-9260-1791 surname: Pirrung fullname: Pirrung, Georg email: gepir@dtu.dk organization: Technical University of Denmark (DTU) – sequence: 5 givenname: Thanasis orcidid: 0000-0003-4415-926X surname: Barlas fullname: Barlas, Thanasis email: tkba@dtu.dk organization: Technical University of Denmark (DTU) |
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| Snippet | Curved tip extensions are among the rotor innovation concepts that can contribute to the higher performance and lower cost of horizontal axis wind turbines.... Abstract Curved tip extensions are among the rotor innovation concepts that can contribute to the higher performance and lower cost of horizontal axis wind... |
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| SubjectTerms | Aerodynamics Blade Element Momentum Computational aerodynamics Computational aeroelasticity Computational Fluid Dynamics Computer applications Design optimization Dihedral angle Fluid flow Geometry Horizontal Axis Wind Turbines IEA 10 MW RWT Lifting Line Load Near wake Numerical analysis Proprietary Simulation Solvers Stalling Sweep angle Turbine blades Turbines Wind power |
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| Title | Comparison of aerodynamic models for horizontal axis wind turbine blades accounting for curved tip shapes |
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