A method to evaluate the overall performance of the CAS-W1 airfoils for wind turbines

Li, Xingxing; Yang, Ke; Bai, Jingyan; Xu, Jianzhong

doi:10.1063/1.4841056

Cited by 14 publications

(11 citation statements)

References 11 publications

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“…Then, parameterization of the desired airfoil features is necessary. The authors have previously established an evaluation method and a related indicator system for the overall aerodynamic performance of wind turbine airfoils . According to the blade requirements presented above, the parameterization of the concerned objectives is introduced in the following section.…”

Section: Design Considerations and Prediction Methodsmentioning

confidence: 99%

“…The parameter system not only helps the overall assessment of dedicated airfoils but also greatly benefits the optimization of the overall airfoil performance. The following section discusses specific aerodynamic objectives based on the performance parameterization presented in the literature High efficiency …”

Section: Design Considerations and Prediction Methodsmentioning

confidence: 99%

“…Therefore, more overall design objectives must be considered during advanced outboard airfoil design. The authors have previously established a method for evaluating the overall aerodynamic performance of wind turbine airfoils . However, an efficient method is still needed to improve the overall performance of outboard airfoils.…”

Section: Introductionmentioning

confidence: 99%

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Overall design optimization of dedicated outboard airfoils for horizontal axis wind turbine blades

Yang

Liao

et al. 2018

Wind Energy

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Designing the primary airfoils for the outboard part of wind turbine blades is a complicated problem of balancing structural, aerodynamic, and acoustic requirements. This paper presents an optimization method for the overall performance of outboard wind turbine airfoils. Based on the complex flow characteristics of the rotor blades and the varying requirements along the span of a blade, the design principles of outboard airfoils were investigated. The requirements for improving the structural performance and reducing the aerodynamic noise were combined with the following aerodynamic design considerations: high efficiency, low extreme loads, stability, and a wide operating region. Thus, this paper proposes a new mathematical model for overall airfoil optimization using the airfoil performance evaluation indicators. Then, an integrated optimization design platform is established for outboard airfoils. Through 2 design cases, new airfoils with desirable aerodynamic characteristics and improved overall performance were obtained.Comparisons between the new airfoils and reference airfoils based on numerical predictions indicate that the proposed method with the newly established mathematical model can effectively balance the complex requirements of the airfoil and improve its overall performance. More notably, the design cases also indicate that the established optimization design method can be used to address special designs of outboard airfoils for different blade requirements. KEYWORDS evaluation parameters, horizontal axis wind turbine, integrated design platform, numerical optimization method, outboard airfoils, overall performance 1 | INTRODUCTION Dedicated airfoils for horizontal axis wind turbines (HAWTs) have evolved over the past several decades and have received increasing attention in recent years because of the increasingly complex aerodynamic and structural requirements of the rotor blades. The airfoil is the profile of the blade cross section, and its performance determines the energy capture performance of the blade. Special airfoils for wind turbines were initially designed in the 1980s. 1 Later, they were intensively developed by the National Renewable Energy Laboratory (NREL), 2 TU Delft, 3 and RISØ, 4 and they have recently nearly replaced traditional aviation airfoils in blade designs. However, with the development of upscaling rotor blades and regional wind farms, the efficient design of special blades operating in different conditions requires advanced airfoils with improved overall performance.Specifically, design methods for improving the overall airfoil performance need to be developed.The early airfoils specially created for wind turbines were designed using the inverse method. 5,6 With the help of subsonic, low Re flow solvers, 7-9 researchers developed some commonly used wind turbine airfoils. However, the inverse design method cannot effectively address the multiobjective design problem. The objectives mainly focused on several aerodynamic force coefficients, such as c l,design or l/d max ...

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Section: Design Considerations and Prediction Methodsmentioning

confidence: 99%

Section: Design Considerations and Prediction Methodsmentioning

confidence: 99%

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Overall design optimization of dedicated outboard airfoils for horizontal axis wind turbine blades

Yang

Liao

et al. 2018

Wind Energy

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“…The evaluation method used in this paper could be found in Ref. 22 and will be introduced concisely as following.…”

Section: Overall Evaluationmentioning

confidence: 99%

“…More detailed introduction about the definition of M stall could be found in Ref. 22. For the Re stability, according to the Re range at which a large thickness airfoil may operate, aerodynamic parameters will be calculated at five different Re (Re ¼ 5 Â 10 6 , 4.0 Â 10 6 , 3.5 Â 10 6 , 3.0 Â 10 6 , 2.5 Â 10 6 ).…”

Section: E Evaluating Indicatorsmentioning

confidence: 99%

Large thickness airfoils with high lift in the operating range of angle of attack

Yang

Zhang

et al. 2014

Journal of Renewable and Sustainable Energy

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This paper presents the design, prediction and evaluation of a family of large thickness airfoils with blunt trailing edges. The family includes four airfoils, whose relative thickness ranges from 45% to 60% and relative thickness of trailing edge ranges from 7% to 16%. These airfoils are designed by the RFOIL solver at different design Reynolds numbers of 4.0 Â 10 6 , 3.5 Â 10 6 , 3.0 Â 10 6 , and 2.5 Â 10 6 with increasing thickness. The design Reynolds numbers are calculated by the operating characteristics of a 5 MW wind turbine. The design objectives focus on the aerodynamic performance in operating ranges of angle of attack at blade root, differing from those of the aviation airfoils and traditional wind turbine airfoils. And the main design constraint is the stability of the lift coefficients in range of large angles of attack with the variation of Reynolds number. The predictions by RFOIL show that, in the range of angle of attack (15 -30 ), the values of lift coefficient of the four new airfoils are largely in the range of (1.0-1.7) and stable with the variation of Reynolds number. These features help obtain more efficient and stable output. The evaluation results indicate that the overall performance of new airfoils is acceptable for the design of multi-MW rotor blades. V C 2014 AIP Publishing LLC.

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A new optimization approach to improve the overall performance of thick wind turbine airfoils

Yang

Bai

et al. 2016

Energy

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A method to evaluate the overall performance of the CAS-W1 airfoils for wind turbines

Cited by 14 publications

References 11 publications

Overall design optimization of dedicated outboard airfoils for horizontal axis wind turbine blades

Overall design optimization of dedicated outboard airfoils for horizontal axis wind turbine blades

Large thickness airfoils with high lift in the operating range of angle of attack

A new optimization approach to improve the overall performance of thick wind turbine airfoils

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