作者： 
X. Zhang, G. G. Wang, M. J. Zhang, W. Li

作者单位： 
^{1}Tianjin Polytechnic University ^{2}State Key Laboratory of Building Safety and Built Environment ^{3}Tianjin Chengjian University

刊名： 
Journal of Engineering Thermophysics, 2017, Vol.26 (4), pp.514531 
来源数据库： 
Springer Journal 
DOI： 
10.1134/S1810232817040075 
英文摘要： 
In this paper, the aerodynamic performance of the S series of wind turbine airfoils with different relative cambers and their modifications is numerically studied to facilitate a greater understanding of the effects of relative camber on the aerodynamic performance improvement of asymmetrical blunt trailingedge modification. The mathematical expression of the blunt trailingedge modification profile is established using the cubic spline function, and S812, S816 and S830 airfoils are modified to be asymmetrical blunt trailingedge airfoils with different thicknesses. The prediction capabilities of two turbulence models, the k  ω SST model and the SA model, are assessed. It is observed that the k  ω SST model predicts the lift and drag coefficients of S812 airfoil more accurately... through comparison with experimental data. The best trailingedge thickness and thickness distribution ratio are obtained by comparing the aerodynamic performance of the modifications with different trailingedge thicknesses and distribution ratios. It is, furthermore, investigated that the aerodynamic performance of original airfoils and their modifications with the best thickness of 2% c and distribution ratio being 0:4 so as to analyze the increments of lift and drag coefficients and lift–drag ratio. Results indicate that with the increase of relative camber, there are relatively small differences in the lift coefficient increments of airfoils whose relative cambers are less than 1.81%, and the lift coefficient increment of airfoil with the relative camber more than 1.81% obviously decreases for the angle of attack less than 6.3°. The drag coefficient increment of S830 airfoil is higher than that of S816 airfoil, and those of these two airfoils mainly decrease with the angle of attack. The average lift–drag ratio increment of S816 airfoil with the relative camber of 1.81% at different angles of attack ranging from 0.1° to 20.2° is the largest, closely followed by S812 airfoil. The lift–drag ratio increment of S830 airfoil is negative as the angle of attack exceeds 0.1°. Thus, the airfoil with medium camber is more suited to the asymmetrical blunt trailingedge modification.

原始语种摘要： 
In this paper, the aerodynamic performance of the S series of wind turbine airfoils with different relative cambers and their modifications is numerically studied to facilitate a greater understanding of the effects of relative camber on the aerodynamic performance improvement of asymmetrical blunt trailingedge modification. The mathematical expression of the blunt trailingedge modification profile is established using the cubic spline function, and S812, S816 and S830 airfoils are modified to be asymmetrical blunt trailingedge airfoils with different thicknesses. The prediction capabilities of two turbulence models, the k  ω SST model and the SA model, are assessed. It is observed that the k  ω SST model predicts the lift and drag coefficients of S812 airfoil more accurately... through comparison with experimental data. The best trailingedge thickness and thickness distribution ratio are obtained by comparing the aerodynamic performance of the modifications with different trailingedge thicknesses and distribution ratios. It is, furthermore, investigated that the aerodynamic performance of original airfoils and their modifications with the best thickness of 2% c and distribution ratio being 0:4 so as to analyze the increments of lift and drag coefficients and lift–drag ratio. Results indicate that with the increase of relative camber, there are relatively small differences in the lift coefficient increments of airfoils whose relative cambers are less than 1.81%, and the lift coefficient increment of airfoil with the relative camber more than 1.81% obviously decreases for the angle of attack less than 6.3°. The drag coefficient increment of S830 airfoil is higher than that of S816 airfoil, and those of these two airfoils mainly decrease with the angle of attack. The average lift–drag ratio increment of S816 airfoil with the relative camber of 1.81% at different angles of attack ranging from 0.1° to 20.2° is the largest, closely followed by S812 airfoil. The lift–drag ratio increment of S830 airfoil is negative as the angle of attack exceeds 0.1°. Thus, the airfoil with medium camber is more suited to the asymmetrical blunt trailingedge modification.
