Aerodynamic Performance Prediction of a Profile in Ground Effect With and Without a Gurney Flap

Cravero, Carlo

doi:10.1115/1.4035137

Cited by 10 publications

(21 citation statements)

References 22 publications

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“…The mesh used has been designed to have a high quality; over 90% of cells have a quality higher than 0.5 and with an equi-angle skewness greater than 0.55 and the aspect ratio is higher than 0.6. This mesh strategy with the same local refinement on the wings has been selected after a grid dependency analysis performed in a previous work [26] on the wing in ground effect analyzed in an isolated form with and without a GF. In the previous work [26], the CFD model was validated by comparing the numerical results with detailed experimental data [38,39] at different distances from ground and with different GF heights.…”

Section: Cfd Modelmentioning

confidence: 99%

“…This mesh strategy with the same local refinement on the wings has been selected after a grid dependency analysis performed in a previous work [26] on the wing in ground effect analyzed in an isolated form with and without a GF. In the previous work [26], the CFD model was validated by comparing the numerical results with detailed experimental data [38,39] at different distances from ground and with different GF heights. The followings boundary conditions have been set: at the inlet of the domain a uniform velocity of 70 m/s and a turbulence intensity of 5% are fixed, while at the outlet of the domain there is a pressure ambient condition.…”

Section: Cfd Modelmentioning

confidence: 99%

“…Extensive aerodynamic analyses on the profile in ground effect have been performed and the simulation of the vortex shedding from the GF has been discussed [26]; a criterion to quantify the wake and the recirculation zone in the vortex shedding mechanism has been developed [27]. The accuracy in numerical prediction of unsteady flows is essential for the vortex shedding mechanisms, but also for other aerodynamic problems like tonal noise [28] or vibro-acoustic stability analysis [29,30].…”

Section: Introductionmentioning

confidence: 99%

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Aerodynamic Effect of the Gurney Flap on the Front Wing of a F1 Car and Flow Interactions with Car Components

Basso

Cravero

2021

Energies

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The design of a racing car needs several aerodynamic design steps in order to achieve high performance. Each component has an aerodynamic interaction with the others and high performance requires a good match between them. The front wing is undoubtedly one of the main components to determine car performance with a strong interaction with the downstream components. The Gurney Flap (GF) is a small appendix perpendicular to the pressure side of the front wing at the trailing edge that can dramatically improve the front wing performance. In the literature, the performance of a GF on a single profile is well documented, while in this paper the GF mounted on the front wing of a racing car has been investigated and the interactions through the 3D flow structures are discussed. The global drag and downforce performance on the main components of the vehicle have been examined by comparing the cases with and without a GF. The GF increases the downforce by about 24% compared to a limited increase in the drag force. A fluid dynamic analysis has been carried out to understand the physical mechanisms of the flow interaction induced to the other components. The GF, in fact, enhances the ground effect, by redistributing the flow that interacts differently with the other components i.e., the wheel zone.

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Section: Cfd Modelmentioning

confidence: 99%

Section: Cfd Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Aerodynamic Effect of the Gurney Flap on the Front Wing of a F1 Car and Flow Interactions with Car Components

Basso

Cravero

2021

Energies

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“…Some studies were also devoted to characterize the effect of Gurney flap on the aerodynamics of airfoils or wing in ground effect. 7,24,25 In these works, the static ground effect was concerned.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gurney flap on the aerodynamic behavior of an airfoil in mutational ground effect

Roozitalab

Kharati-Koopaee

2020

Proceedings of the Institution of Mechanical Engineers, Part G:

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In this research, the effect of Gurney flap on the aerodynamic behavior of an airfoil in mutational ground effect is investigated. To perform this, lift and drag coefficients of NACA 4412 airfoil section in the presence and absence of Gurney flap in mutational ground effect are evaluated and compared. To provide a better illustration of the effect of Gurney flap on the aerodynamic behavior of the airfoil section in the mutational ground effect, results are obtained during the takeoff and landing processes. Validation of the used numerical model is also performed by comparison of the obtained results with those of other works and reasonable agreements were seen. Results show that inclusion of Gurney flap to the airfoil leads to higher variations of lift and drag coefficients during takeoff and landing process. During the takeoff process, the flapped airfoil results in a higher lift decrement and drag increment although an increase in distance of airfoil from the ground or angle of attack causes the lift decrement of the flapped airfoil to get close to that of clean airfoil. It is shown that during takeoff process, downwash is generated around the airfoil as the airfoil leaves the step and as the airfoil gets away from the step, the generated downwash decreases. During the landing process, at each distance of airfoil form the ground and angle of attack, the lift decrement and drag increment of the flapped airfoil are significant compared to that of the clean airfoil. Results exhibit that during landing process, upwash is generated around the airfoil as the airfoil reaches the step and further airfoil move on the step leads to the decrease in the upwash. The decrement in lift coefficient and also the increment in drag coefficient during landing process are more remarkable than those in takeoff process.

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“…Gurney flaps have been widely used and studied in airfoil static/dynamic stall control [2][3][4][5], flutter control [6], flapping airfoil control [7], ground effects [8], and rotor blade load control [9][10][11][12][13]. In these applications, the increases in the lift and the drag are closely related to airfoils, flow conditions, and the flap geometry.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gurney Flap Geometry on a S809 Airfoil

Hao

Gao

2019

International Journal of Aerospace Engineering

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In this paper, the effect of Gurney flap shapes on wind turbine blade airfoil S809 has been studied by numerical simulation. First, the O-type grid is used in the numerical simulation. By comparing with experimental data, such as the lift force, the drag coefficient, and the pressure distribution, the accuracy of the simulation method is validated. Second, the research on the widths of three kinds of rectangular Gurney flaps at the trailing edge of the S809 airfoil is carried out. Rectangular Gurney flaps can considerably increase the lift in both the linear and nonlinear sections, and the maximum lift coefficient can be increased by 20.65%. In addition, the drag and the pitching moment are increased. However, the width of the rectangular Gurney flap has a small impact on the lift, the drag, and the pitching moment. Finally, the effects of rectangular and triangular Gurney flaps on the aerodynamic characteristics of the S809 airfoil are compared. The results show that the triangular flaps can obtain an increase of maximum lift coefficient by 28.42%, which is better than 16.31% of the rectangular flaps.

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Aerodynamic Performance Prediction of a Profile in Ground Effect With and Without a Gurney Flap

Cited by 10 publications

References 22 publications

Aerodynamic Effect of the Gurney Flap on the Front Wing of a F1 Car and Flow Interactions with Car Components

Aerodynamic Effect of the Gurney Flap on the Front Wing of a F1 Car and Flow Interactions with Car Components

Effect of Gurney flap on the aerodynamic behavior of an airfoil in mutational ground effect

Effect of Gurney Flap Geometry on a S809 Airfoil

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