Effect of winglets induced tip vortex structure on the performance of subsonic wings

Narayan, G.; John, Bibin

doi:10.1016/j.ast.2016.08.031

Cited by 56 publications

(33 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in the figure, the increase in the AR values generally leads to a rise in the C L /C D ratio between AoA=0 0 and AoA=30 0 . As can be seen that the results are compatible with literature studies [16,17]. C L values versus C D values obtained from experiments at different aspect ratios are given in Figure 5(b).…”

Section: Resultssupporting

confidence: 91%

The impact of aspect ratio on aerodynamic performance and flow separation behavior of a model wing composed from different profiles

Aşkan

Tangöz

2018

Journal of Energy Systems

View full text Add to dashboard Cite

In this study the impact of aspect ratio on the aerodynamic performances and flow separation behavior were investigated on a model wing made up four different profiles used to the wing of the Boeing 737-Classic aircrafts. The experiments were carried out in a wind tunnel with low speed at different angles of attack ranging from -4° to 40° and at the 2x10 5 Reynolds number on wing models having different aspect ratios (0.7-1.3). It was observed from the experiments and numerical studies that the changing of the aspect ratio affected the drag and lift and flow separation. The highest lift/drag ratio has been measured from the wing having aspect ratio of 1.3 at angle of attack of 7 0 . Moreover, the airflow was flowed as laminar in the areas near the middle of the wing until angle of attack of 24 0 . But, the flow was disturbed at wing tip due to vortex. The separation bubbles have been seen at 24°-32 0 for all aspect ratios. In addition, the increase of angle of attack caused the bubbles form clearly for 1.1 and 1.3 aspect ratios. Finally, the increases in aspect ratio and in angle of attack have been triggered flow separation. Cite this paper as:Aşkan, A., Tangöz, S., The impact of aspect ratio on aerodynamic performance and flow separation behavior of a model wing composed from different profiles.

show abstract

Section: Resultssupporting

confidence: 91%

The impact of aspect ratio on aerodynamic performance and flow separation behavior of a model wing composed from different profiles

Aşkan

Tangöz

2018

Journal of Energy Systems

View full text Add to dashboard Cite

show abstract

“…Reducing the drag force on wind turbines can be done by using winglets. The winglets reduce vortex that occurs on the tip of the blade [2]- [5]. The addition of the device on HAWT, that is adding winglets on the tip of the blade is able to increase the performance by splitting the flow on the tip as well as to give positive effect towards the vortex reduction [6]- [9].…”

Section: Introductionmentioning

confidence: 99%

“…The winglet type selection on the blade turbine affect the produced performance, thus winglets type adaptation towards the geometry of the blades are needed, hence there is no significant change in the ratio aspect on the blade geometry towards the addition of winglets, which affects the increase of drag profile and losing the energy in the system [7]. The paper referred in [5] giving the result in the form of winglets addition on the part of the blade gives a better performance on the rotor than the blade without winglets, because the addition of winglets on the blade in this study is able to stimulate the lift force resulted from the vortex which is able to be generated. According to these studies from [10]- [12], they explain that the addition of pitch angle variations on HAWT aims at serving as torque starting, that is the angle used for rotating the turbine initially because of the on the low wind speed, it results from high torque.…”

Section: Introductionmentioning

confidence: 99%

The Experimental investigation and Numerical Analysis on Horizontal Axis Wind Turbine with Winglet and Pitch Variations

Satwika¹,

Hantoro²,

Sarwono³

et al. 2019

View full text Add to dashboard Cite

HAWT with three blades often used because it has the highest coefficient of performance among other turbines. The airfoil used is Clark-Y type because it has a high glide ratio (coefficient lift/coefficient drag) in the application of subsonic flow. The main purpose of this study is to increase the power coefficient value obtained by the increase of lift force on each airfoil of blade compiler and to fix the wind turbine performance. One of the variations added is the addition of winglets on the tip of the blade. The method employed is a laboratory scaled experiment by using wind tunnel. Theoretically, this study also applied blade element momentum (BEM) as the calculation of each segment on the airfoil, and the simulation was carried out with computational fluid dynamics (CFD), in order to find out the characteristics of flow passing by the rotor. The advantage of using winglets is, fostering the condition of starting wind turbine rotor on low tip speed ratio (TSR) condition by varying the pitch angle on the blade. The addition of pitch variation gives an advantage that it can maximize the wind speed towards the angle of attack to the airfoil; hence, it increases the aerodynamic effect on the rotor.

show abstract

“…For example, Elham A and Van Tooren MJL [8] optimized the aerodynamic and structural characteristics of wing to balance between the minimum drag and minimum weight of wing. Narayan G and John B [9] studied the tip vortex structure induced by the winglet of the subsonic wings ,and the results show that the winglet is more suitable for the lower aspect ratio wings.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation the Effect of the Different Tip Vanes on the Loading of an H-VAWT

Wang

Yang

et al. 2018

E3S Web Conf.

View full text Add to dashboard Cite

In this paper, the effect of the three typical tip vanes on the loading of an H-VAWT is investigated by employing the three-dimensional unsteady numerical simulation method. The results show that the both transient tangential force coefficient (CT) and normal force coefficient (Cn) have obvious change when the winglet and the V type vane is used at the blade's tip, respectively. However, in three tip vanes, the CT average value is the lowest and the CT fluctuation characteristic is the highest when the winglet is used. Although the winglet and V type vane contribute to change the transient CT and Cn, the normal force is increased too, it results in increasing fatigue loading and decreasing lifetime for H-VAWT. By comparison, the effect of the plate vane on the loading is weaker. Additionally, the winglet is advantage to improve power coefficient in the low tip speed ratio.

show abstract

Effect of winglets induced tip vortex structure on the performance of subsonic wings

Cited by 56 publications

References 9 publications

The impact of aspect ratio on aerodynamic performance and flow separation behavior of a model wing composed from different profiles

The impact of aspect ratio on aerodynamic performance and flow separation behavior of a model wing composed from different profiles

The Experimental investigation and Numerical Analysis on Horizontal Axis Wind Turbine with Winglet and Pitch Variations

Numerical Investigation the Effect of the Different Tip Vanes on the Loading of an H-VAWT

Contact Info

Product

Resources

About