Influence of endplate on aerodynamic characteristics of low-aspect-ratio wing in ground effect

Park, Kyoungwoo; Lee, Ju Hee

doi:10.1007/s12206-008-0805-y

Cited by 44 publications

(27 citation statements)

References 5 publications

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“…A larger pitch angle results in a higher increase in lift coefficient. This result, greater lift at lower height, agrees well with those of other research[5,17,24,25]. It is also shown inFig.…”

supporting

confidence: 93%

“…For representing the exact flight conditions, the moving wall boundary condition with a flight velocity is applied at the ground. The solutions are treated as converged ones when the sum of normalized residual is less than 5 1 10 − × . A fan performance curve for the propeller was not available.…”

Section: Computational Modelsmentioning

confidence: 99%

“…Due to the air cushion at low heights, there is a considerable increase in lift with a decrease in drag, and therefore enhancement of the lift-drag ratio [1][2][3][4][5]. The enhancement of the liftdrag ratio makes the WIG effect vehicle a potential means of transportation.…”

Section: Introductionmentioning

confidence: 99%

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Three-dimensional flow characteristics of propeller-propulsion WIG effect vehicle with direct underside pressurization

Kim

Park

2011

J Mech Sci Technol

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Numerical investigations for a 3-dimensional WIG effect vehicle with DUP (direct underside pressurization) have been performed. The purpose of this study is to analyze the aerodynamic characteristics and static height stability of DUP using computational fluid dynamics (CFD). When a WIG effect vehicle accelerates to take off on water, increased pressure under the fuselage by DUP (propeller and air chamber) can considerably reduce the take-off speed and thus minimize the effect of the hump drag which is one of the technical difficulties of a WIG effect vehicle. The accelerated air by the propeller enters the air chamber through a channel in the middle of the fuselage resulting in an augmentation of the lift by changing the air pressure from dynamic to static. However, the DUP is not favorable for both stability and aerodynamic performance of the WIG effect vehicle because the accelerated air produces an excessive drag, negative pitching moment and 3-dimensional effects (that is, yawing and rolling moments). The result shows that the effect of yawing and rolling moments is not serious.

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confidence: 93%

Section: Computational Modelsmentioning

confidence: 99%

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Three-dimensional flow characteristics of propeller-propulsion WIG effect vehicle with direct underside pressurization

Kim

Park

2011

J Mech Sci Technol

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“…Smith (2007) and Smith et al (2008) have performed the computational analysis of airfoils in ground effect. The influence of endplate on aerodynamic characteristics for low-aspect-ratio wing in ground effect is performed by Park and Lee (2008). Moon et al (2005) have examined three-dimensional wings in ground effect for aero-levitation electric vehicle.…”

Section: Introductionmentioning

confidence: 99%

Application of smart flap for race car wings

Djavareshkian

Esmaeli

2012

IJAD

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Abstract:A pressure-based implicit procedure is due to solve Navier-Stokes equations. A non-orthogonal mesh with collocated finite volume formulation is used to simulate flow around the smart and conventional flaps of airfoil under the ground effect. Cantilever beam with uniformly varying load with roller support at the free end is considered for smart flaps. The boundedness criteria for this procedure are determined by a normalised variable diagram (NVD) scheme. The procedure incorporates the k -ε eddy-viscosity turbulence model. The method is first validated against experimental data. Then, the SIMPLE algorithm is applied for turbulent aerodynamic flows around airfoil with smart and conventional flaps for different attack angle, flap angle and ground clearance where the results of two flaps are compared. It is found that the pressure coefficient distribution in a smart flap is smoother than a conventional one. The comparisons show that the quality of the solution is considerable.

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“…Recently, Park and Lee [9] carried out a numerical investigation into the effect of an endplate at various angles of attack and ground clearances. They found that the endplate prevented the high-pressure air from escaping out of the lower wing surface, reduced the influence of the wing-tip vortex, and augmented the lift and lift-drag ratio further.…”

Section: Introductionmentioning

confidence: 99%

Influence of Wing Configurations on Aerodynamic Characteristics of Wings in Ground Effect

Han

Bae

2010

Journal of Aircraft

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A numerical analysis is performed to investigate the aerodynamic characteristics and the static height stability of the endplate and the anhedral angle on an aspect-ratio-one wing-in-ground effect. The analysis shows that the ground effect increases the lift by the high pressure on the lower surface, reduces the drag, increases the suction on the upper surface, and considerably enhances the lift-drag ratio. The endplate, which prevents the high-pressure air from escaping out of the lower surface and reduces the influence of the wing-tip vortex, further augments the lift and the lift-drag ratio. Irodov's criteria are also numerically evaluated in order to investigate the static height stability. The comparison of Irodov's criteria shows that the endplate is not favorable for the static height stability. However, the anhedral angle improves the lift as well as Irodov's criteria at various angles of attack and heights. Interestingly, the stagnation point for the anhedral angle moves forward with decreasing height at the low angles of attack and leads an increase in the pressure drag at the leading edge. This increase nullifies the advantages of the induced drag and the pressure drag. Thus, the lift-drag ratio of a wing is not improved as much with an anhedral angle as it is with an endplate.

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Influence of endplate on aerodynamic characteristics of low-aspect-ratio wing in ground effect

Cited by 44 publications

References 5 publications

Three-dimensional flow characteristics of propeller-propulsion WIG effect vehicle with direct underside pressurization

Three-dimensional flow characteristics of propeller-propulsion WIG effect vehicle with direct underside pressurization

Application of smart flap for race car wings

Influence of Wing Configurations on Aerodynamic Characteristics of Wings in Ground Effect

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