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

Li, Xing-xing; Yang, Ke; Zhang, Lei; Bai, Jingyan; Xu, Jianzhong

doi:10.1063/1.4878846

Cited by 17 publications

(3 citation statements)

References 15 publications

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“…The development of thick airfoils for the inner part of the blade of the wind turbine has been approached by different methodologies (blade element theory, experimental test and numerical simulations [8][9][10]). The good stall characteristics can help to keep high aerodynamic performance and prevent structural problems for the blade [11].…”

Section: Introductionmentioning

confidence: 99%

Towards an Airfoil Catalogue for Wind Turbine Blades at IDR/UPM Institute with OpenFOAM

Sorribes-Palmer¹,

Donisi²,

Pindado³

et al. 2018

J Aerosp Eng Mech

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A methodology to efficiently simulate wind tunnel tests of several airfoils with OpenFOAM has been developed in this work. This methodology bridges OpenFOAM capabilities with MATLAB post-processing in order to analyze efficiently the performance of wind turbine airfoils at any angle of attack. This technique has been developed to reduce the cost, in terms of time and resources, of wind tunnel campaigns on wind turbine blade airfoils. Different turbulence models were used to study the behavior of the airfoils near stall. Wind turbine airfoils need to be characterized for all possible angles of attack, in order to reproduce the real aerodynamic patterns during operation. Unfortunately, this situation is translated into a huge demand of wind tunnel testing resources, airfoil manufacturing and data post-processing. The high costs in terms of experimental measurements have encouraged many researches to elaborate airfoil catalogues by performing Computational Fluid Dynamics (CFD) simulations. Results are compared with a testing campaign on wind turbine airfoils aerodynamics run at AB6 wind tunnel of IDR/UPM located at the campus Universidad Politécnica de Madrid (Madrid, Spain), this tunnel being particularly suited for bi-dimensional applications. It is an open wind tunnel with a test section of 2.5 × 0.5 m, the turbulence intensity is under 3% at a Reynolds number of Re ≅ 5•10 5 .

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Section: Introductionmentioning

confidence: 99%

Towards an Airfoil Catalogue for Wind Turbine Blades at IDR/UPM Institute with OpenFOAM

Sorribes-Palmer¹,

Donisi²,

Pindado³

et al. 2018

J Aerosp Eng Mech

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“…44 Therefore, modern thick wind turbine airfoils are generally designed with blunt TEs. 43,45 Although the NACA 63-421 airfoil is designed with sharp TE, the baseline of its T tr was set as 0.005 in the study. The exploration space of the DOE for the baseline airfoil is listed in Table 3.…”

Section: Case Of Studymentioning

confidence: 99%

Parametric exploration on the airfoil design space by numerical design of experiment methodology and multiple regression model

Yang

2019

Proceedings of the Institution of Mechanical Engineers, Part A:

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Robust airfoil design is crucial to efficient, stable, and safe operation for modern wind turbines. However, even for deterministic wind turbine airfoil design, the problem is complex regarding to aerodynamic, acoustic, and structural requirements of wind turbine blades. Therefore, this study aims to assess the design variable impact, identify significant variables, and obtain the correlation with the airfoil responses, to reduce the cost of the airfoil robust optimization. In this paper, the optimal hypercube design method was applied to an airfoil designed by the National Advisory Committee for Aeronautics, NACA 63-421, which is commonly employed in the outboard modern wind turbine blade, to perform the numerical design of experiments. Then, a parametric exploration on the characteristics of airfoil design space by the multiple regression model and statistical analysis method were conducted. It was identified that in regular design space, the variations of aerodynamic and structural parameters are dominated by the airfoil camber and radius of leading edge. Meanwhile, the chord-wise position of the maximum thickness also has strong impacts on the airfoil performance. In further, the overall design spaces are explored to be highly nonlinear in aerodynamic and acoustic responses because of the nonlinear effects of the airfoil chord-wise position of the maximum camber and radius of leading edge. Strong but undesirable correlations were demonstrated between the maximum lift-to-drag ratio and the total sound pressure level. These findings could serve as a valuable guidance for wind turbine airfoil robust design to screen the stochastic design variables, simplify the design space, and reduce the cost.

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“…Besides the inverse design method, The Institute of Engineering ThermoPhysicss (IET) produced a model based on the RFOIL algorithm [14] and a new 45% root airfoil family with competitive lift performance at high angles of attack when compared to the DU 00-W2-401 (40% relative thickness) [15].…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic Characteristics Evaluation of S-Series Airfoils

Jaffar,

Al-Sadawi,

Khudair

et al. 2023

ETJ

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Ansys-Fluent predicts flow around thick airfoils wall at low/mid angles. High angles: lift, drag, near-wake • The airfoil shape significantly shapes the airfoil and wake region flow • S818, S811 airfoils performed best in crossflow while S809, S814 showed poor aerodynamics, especially at high anglesThe present study utilizes the commercial software ANSYS-Fluent to explore the influence of the geometry of thick S-S-series airfoil on the near-wake region. Four different S-series airfoils, namely S809, S811, S814, and S818, were investigated at a wide range of angles of attack, which were varied from 0 degrees to 20 degrees with an increment of 2 degrees and at a Reynolds number based on chord length Re = 1x10 6 . Analysis of the resultant data revealed that the aerodynamic performance of the S811 and S818 airfoils superseded that of the S809 and S814 airfoils. To illustrate, at the critical angle of attack, S811 and S818 were observed to possess the maximum lift and minimum drag coefficients. Furthermore, in the range of attack angles between 10 and 16 degrees, these airfoils consistently demonstrated lower drag than the others tested, enhancing overall aerodynamic performance. These findings underscore the significant role played by airfoil geometry in influencing aerodynamic performance and provide insights into optimal design parameters for wind turbine blades, particularly highlighting the advantages of the S811 and S818 airfoil shapes. In addition, the effect of the unsteady structures in the near-wake zone behind the trailing was also evaluated through turbulence kinetic energy contours. The results revealed a decrease in turbulence kinetic energy when the S811 and S818 airfoils were placed in a crossflow compared to the S809 and S814 airfoils. This indicates that the strength of the vortex shedding of these airfoils is lower than that of the S809 and S8014 airfoils.

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

Cited by 17 publications

References 15 publications

Towards an Airfoil Catalogue for Wind Turbine Blades at IDR/UPM Institute with OpenFOAM

Towards an Airfoil Catalogue for Wind Turbine Blades at IDR/UPM Institute with OpenFOAM

Parametric exploration on the airfoil design space by numerical design of experiment methodology and multiple regression model

Aerodynamic Characteristics Evaluation of S-Series Airfoils

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