Simulation of aerodynamic performance affected by vortex generators on blunt trailing-edge airfoils

2010 ◽  
Vol 53 (1) ◽  
pp. 1-7 ◽  
Author(s):  
Ke Yang ◽  
Lei Zhang ◽  
JianZhong Xu
Keyword(s):  
Aerodynamic Performance ◽  
Vortex Generators ◽  
Trailing Edge ◽  
Blunt Trailing Edge

scholarly journals The Effect of Gurney Flap and Trailing-edge Wedge on the Aerodynamic Behavior of an Axial Turbine Blade

2021 ◽  
Vol 2 (4) ◽  
pp. 293-305
Author(s):  
Mohammad Mahdi Mahzoon ◽  
Masoud Kharati-Koopaee
Keyword(s):  
Angle Of Attack ◽  
Vortex Generator ◽  
Aerodynamic Performance ◽  
Trailing Edge ◽  
Blunt Trailing Edge ◽  
Gurney Flap ◽  
Maximum Increment ◽  
Lift And Drag ◽  
Lift And Drag Coefficient

In this research, the effect of Gurney flap and trailing-edge wedge on the aerodynamic behavior of blunt trailing-edge airfoil Du97-W-300 which is equipped with vortex generator is studied. To do this, the role of Gurney flap and trailing-edge wedge on the lift and drag coefficient and also aerodynamic performance of the airfoil is studied. Validation of the numerical model is performed by comparison of the obtained results with those of experiment. Results show that before stall, Gurney flap leads to the increase in the aerodynamic performance in a wider range of angle of attack. Numerical findings reveal that the maximum increment for the aerodynamic performance is obtained at low angle of attack when trailing-edge wedge is employed. It is found that for the highest considered value of Gurney flap and trailing-edge wedge heights, where the highest values for the lift occur, the higher aerodynamic performance at low angle of attack is obtained when trailing-edge wedge is used and at high angle of attack, the Gurney flap results in a higher aerodynamic performance. It is also shown that when high aerodynamic performance is concerned, addition of Gurney flap to the airfoil leads to the higher value for the lift. Doi: 10.28991/HIJ-2021-02-04-03 Full Text: PDF

Aerodynamic Performance of Thick Blunt Trailing Edge Airfoils

2010 ◽  
Author(s):  
Aubryn Cooperman ◽  
Anthony McLennan ◽  
Jonathon Baker ◽  
C van Dam ◽  
Raymond Chow
Keyword(s):  
Aerodynamic Performance ◽  
Trailing Edge ◽  
Blunt Trailing Edge

Thick Airfoils With Blunt Trailing Edge for Wind Turbine Blades

2010 ◽  
Author(s):  
C. P. van Dam ◽  
A. Cooperman ◽  
A. McLennan ◽  
R. Chow ◽  
J. Baker
Keyword(s):  
Wind Turbine ◽  
Fluid Dynamic ◽  
Lift Coefficient ◽  
Turbine Blades ◽  
Aerodynamic Performance ◽  
Boundary Layer Transition ◽  
Performance Characteristics ◽  
Trailing Edge ◽  
Layer Transition ◽  
Blunt Trailing Edge

This paper addresses the primary concerns regarding the aerodynamic performance characteristics of thick airfoils with blunt trailing edges (or so-called flatback airfoils) and the utilization of these section shapes in the design of rotor blades for utility-scale wind turbines. Results from wind tunnel and computational fluid dynamic studies demonstrate the favorable impact of the blunt trailing edge on the aerodynamic performance characteristics including higher maximum lift coefficient and reduced sensitivity of lift to premature boundary layer transition. The negative effect of the blunt trailing edge on drag can be partially mitigated through simple trailing edge treatments such as splitter plates. Studies on the effect of these section shapes on wind turbine rotor performance show that at attached flow conditions this inboard blade modification does not adversely affect rotor torque output. Blade system design studies involving the collective optimization of aerodynamic performance, structural strength and weight, and manufacturing complexity demonstrate the overall favorable impact of the flatback concept.

Effects of vortex generators on a blunt trailing-edge airfoil for wind turbines

2015 ◽  
Vol 76 ◽  
pp. 303-311 ◽  
Author(s):  
Linyue Gao ◽  
Hui Zhang ◽  
Yongqian Liu ◽  
Shuang Han
Keyword(s):  
Wind Turbines ◽  
Vortex Generators ◽  
Trailing Edge ◽  
Blunt Trailing Edge

scholarly journals Aerodynamic Performance Analysis of a Modified Joukowsky Airfoil: Parametric Control of Trailing Edge Thickness

2021 ◽  
Vol 11 (18) ◽  
pp. 8395 ◽  
Author(s):  
Pan Xiong ◽  
Lin Wu ◽  
Xinyuan Chen ◽  
Yingguang Wu ◽  
Wenjun Yang
Keyword(s):  
Vortex Structure ◽  
Lift Coefficient ◽  
Angle Of Attack ◽  
Aerodynamic Performance ◽  
Vortex Generation ◽  
Trailing Edge ◽  
K Value ◽  
Blunt Trailing Edge ◽  
The Impact ◽  
Drag Ratio

In order to ensure the blade strength of large-scale wind turbine, the blunt trailing edge airfoil structure is proposed, aiming at assessing the impact of the trailing edge shape on the flow characteristics and airfoil performance. In this paper, a Joukowsky airfoil is modified by adding the tail thickness parameter K to achieve the purpose of accurately modifying the thickness of the blunt tail edge of the airfoil. Using Ansys Fluent as a tool, a large eddy simulation (LES) model was used to analyze the vortex structure of the airfoil trailing edge. The attack angles were used as variables to analyze the aerodynamic performance of airfoils with different K-values. It was found that when α = 0°, α = 4°, and α = 8°, the lift coefficient and lift–drag ratio increased with increasing K-value. With the increase in the angle of attack from 8° to 12°, the lift–drag ratio of the airfoil with the blunt tail increased from +70% to −7.3% compared with the original airfoil, which shows that the airfoil with the blunt trailing edge has a better aerodynamic performance at a small angle of attack. The aerodynamic characteristics of the airfoil are affected by the periodic shedding of the wake vortex and also have periodic characteristics. By analyzing the vortex structure at the trailing edge, it was found that the value of K can affect the size of the vortex and the position of vortex generation/shedding. When α = 0°, α = 4°, and α = 8°, the blunt trailing edge could improve the aerodynamic performance of the airfoil; when α = 12°, the position of vortex generation changed, which reduced the aerodynamic performance of the airfoil. Therefore, when designing the trailing edge of an airfoil, the thickness of the trailing edge can be designed according to the specific working conditions. It can provide valuable information for the design and optimization of blunt trailing edge airfoil.

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