Flow control on wind turbine airfoil affected by the surface roughness using leading-edge protuberance

2019 ◽  
Vol 11 (6) ◽  
pp. 063304 ◽  
Author(s):  
Yinan Zhang ◽  
Mingming Zhang ◽  
Chang Cai
Keyword(s):  
Surface Roughness ◽  
Flow Control ◽  
Wind Turbine ◽  
Leading Edge ◽  
Wind Turbine Airfoil

Aerodynamic Analysis of an Airfoil With Leading Edge Pitting Erosion

2017 ◽  
Vol 139 (6) ◽  
Author(s):  
Yan Wang ◽  
Ruifeng Hu ◽  
Xiaojing Zheng
Keyword(s):  
Wind Turbine ◽  
Indirect Effects ◽  
Leading Edge ◽  
Aerodynamic Performance ◽  
Navier Stokes ◽  
Distribution Area ◽  
Navier Stokes Equation ◽  
Turbine Performance ◽  
Wind Turbine Airfoil ◽  
Cfd Method

Leading edge erosion is a considerable threat to wind turbine performance and blade maintenance, and it is very imperative to accurately predict the influence of various degrees of erosion on wind turbine performance. In the present study, an attempt to investigate the effects of leading edge erosion on the aerodynamics of wind turbine airfoil is undertaken by using computational fluid dynamics (CFD) method. A new pitting erosion model is proposed and semicircle cavities were used to represent the erosion pits in the simulation. Two-dimensional incompressible Reynolds-averaged Navier–Stokes equation and shear stress transport (SST) k–ω turbulence model are adopted to compute the aerodynamics of a S809 airfoil with leading edge pitting erosions, where the influences of pits depth, densities, distribution area, and locations are considered. The results indicate that pitting erosion has remarkably undesirable influences on the aerodynamic performance of the airfoil, and the critical pits depth, density, and distribution area degrade the airfoil aerodynamic performance mostly were obtained. In addition, the dominant parameters are determined by the correlation coefficient path analysis method, results showed that all parameters have non-negligible effects on the aerodynamics of S809 airfoil, and the Reynolds number is of the most important, followed by pits density, pits depth, and pits distribution area. Meanwhile, the direct and indirect effects of these factors are analyzed, and it is found that the indirect effects are very small and the parameters can be considered to be independent with each other.

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

2019 ◽  
Vol 234 (1) ◽  
pp. 3-18 ◽  
Author(s):  
Xingxing Li ◽  
Ke Yang
Keyword(s):  
Regression Model ◽  
Wind Turbine ◽  
Multiple Regression ◽  
Design Space ◽  
Leading Edge ◽  
Multiple Regression Model ◽  
Highly Nonlinear ◽  
Numerical Design ◽  
Wind Turbine Airfoil ◽  
The Cost

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.

scholarly journals Flow Control on Wind Turbine Airfoil with a Vortex Cell

2012 ◽  
Vol 40 (5) ◽  
pp. 405-412
Author(s):  
Seung-Hee Kang ◽  
Hye-Ung Kim ◽  
Ki-Wahn Ryu ◽  
Jun-Shin Lee
Keyword(s):  
Flow Control ◽  
Wind Turbine ◽  
Vortex Cell ◽  
Wind Turbine Airfoil

Flow Control for NREL S822 Wind Turbine Airfoil

AIAA Journal ◽  
2012 ◽  
Vol 50 (12) ◽  
pp. 2779-2790 ◽  
Author(s):  
A. Gross ◽  
H. F. Fasel
Keyword(s):  
Flow Control ◽  
Wind Turbine ◽  
Wind Turbine Airfoil

Flow Control for Wind Turbine Airfoil

2011 ◽  
Author(s):  
Andreas Gross ◽  
Hermann F. Fasel
Keyword(s):  
Flow Control ◽  
Wind Turbine ◽  
Active Flow Control ◽  
Turbine Blades ◽  
Vortex Generator ◽  
Suction Side ◽  
Boundary Layer Separation ◽  
Plasma Actuators ◽  
Flip Flop ◽  
Wind Turbine Airfoil

The flow over a NREL S822 wind turbine airfoil was simulated for a chord Reynolds number of 100,000 and an angle of attack of 5deg. These conditions approximately match the blade element conditions at 80% radius of a 2m diameter turbine operating at 300rpm. A simulation of the uncontrolled flow with steady approach flow conditions shows boundary layer separation on the suction side which is consistent with University of Illinois at Urbana-Champaign experimental data. Active flow control has the potential to locally (and on demand) reduce the unsteady loads on individual turbine blades during non-nominal operation, thereby increasing turbine life. In addition, flow control may help lower the cut-in wind speed. Unsteady flow control for reducing the suction side separation using pulsed vortex generator jets, flip-flop jets, and plasma actuators were evaluated. It was found that very low actuation amplitudes were already sufficient for eliminating the suction side separation. The high effectiveness and efficiency is traced back to hydrodynamic instabilities that lead to a downstream growth of the forced disturbances. Too high actuator amplitudes resulted in early disturbance saturation which made the control inefficient.

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