Numerical Testing of the Wing-in-Ground Effect on Aerodynamic Characteristics

This paper presents the numerical evaluation of ground (proximity) effects on the basic aerodynamic characteristics of a specifically designed airplane model. The ground effects were investigated in relation to the angle of attack and flight altitude. The results were referenced to the characteristics of an object in motion unaffected by ground effects.

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The Influence of Wing Span and Angle of Attack on Racing Car Wing/Wheel Interaction Aerodynamics

Journal of Fluids Engineering ◽

10.1115/1.4035877 ◽

2017 ◽

Vol 139 (6) ◽

Cited By ~ 1

Author(s):

Sammy Diasinos ◽

Tracie J. Barber ◽

Graham Doig

Keyword(s):

Angle Of Attack ◽

Ground Effect ◽

Navier Stokes ◽

Flow Structures ◽

Wing Span ◽

Complex Interactions ◽

Lift And Drag ◽

Two Bodies ◽

Wing In Ground Effect

A numerical-based (Reynolds-averaged Navier–Stokes (RANS)) investigation into the role of span and wing angle in determining the performance of an inverted wing in ground effect located forward of a wheel is described, using a generic simplified wheel and NACA 4412 geometry. The complex interactions between the wing and wheel flow structures are investigated to explain either increases or decreases for the downforce and drag produced by the wing and wheel when compared to the equivalent body in isolation. Geometries that allowed the strongest primary wing vortex to pass along the inner face of the wheel resulted in the most significant reductions in lift and drag for the wheel. As a result, the wing span and angle combination that would produce the most downforce, or least drag, in the presence of the wheel does not coincide with what would be assumed if the two bodies were considered only in isolation demonstrating the significance of optimizing these two bodies in unison.

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Experimental Aerodynamic Characteristics of a Compound Wing in Ground Effect

Journal of Fluids Engineering ◽

10.1115/1.4026618 ◽

2014 ◽

Vol 136 (5) ◽

Cited By ~ 2

Author(s):

Saeed Jamei ◽

Adi Maimun Abdul Malek ◽

Shuhaimi Mansor ◽

Nor Azwadi Che Sidik ◽

Agoes Priyanto

Keyword(s):

Reynolds Number ◽

Drag Coefficient ◽

Center Of Pressure ◽

Lift Coefficient ◽

Angle Of Attack ◽

Leading Edge ◽

Ground Effect ◽

Reynolds Numbers ◽

Aerodynamic Characteristics ◽

Ground Clearance

Wing configuration is a parameter that affects the performance of wing-in-ground effect (WIG) craft. In this study, the aerodynamic characteristics of a new compound wing were investigated during ground effect. The compound wing was divided into three parts with a rectangular wing in the middle and two reverse taper wings with anhedral angle at the sides. The sectional profile of the wing model is NACA6409. The experiments on the compound wing and the rectangular wing were carried to examine different ground clearances, angles of attack, and Reynolds numbers. The aerodynamic coefficients of the compound wing were compared with those of the rectangular wing, which had an acceptable increase in its lift coefficient at small ground clearances, and its drag coefficient decreased compared to rectangular wing at a wide range of ground clearances, angles of attack, and Reynolds numbers. Furthermore, the lift to drag ratio of the compound wing improved considerably at small ground clearances. However, this improvement decreased at higher ground clearance. The drag polar of the compound wing showed the increment of lift coefficient versus drag coefficient was higher especially at small ground clearances. The Reynolds number had a gradual effect on lift and drag coefficients and also lift to drag of both wings. Generally, the nose down pitching moment of the compound wing was found smaller, but it was greater at high angle of attack and Reynolds number for all ground clearance. The center of pressure was closer to the leading edge of the wing in contrast to the rectangular wing. However, the center of pressure of the compound wing was later to the leading edge at high ground clearance, angle of attack, and Reynolds number.

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Оценка аэродинамических и летно-технических характеристик экраноплана с учетом поддува струи от воздушного винта

ВЕСТНИК ИНЖЕНЕРНОЙ ШКОЛЫ ДВФУ ◽

10.24866/2227-6858/2021-1-2 ◽

2021 ◽

Vol 46 (1) ◽

Author(s):

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Computational Experiment ◽

Ground Effect ◽

Aerodynamic Characteristics ◽

Flight Performance ◽

Analysis Program ◽

Kinematic Parameters ◽

Element Analysis ◽

Wing In Ground Effect

Аннотация: Представлены основные результаты исследования (с использованием CFD-технологий и упрощенной авторской методики) аэродинамических характеристик экраноплана схемы «тандем» с учетом поддува и влияния струи от движителя – воздушного винта. Вычислительный эксперимент производился в программе ANSYS. Его условия предусматривали изменение кинематических параметров полета и положения экраноплана относительно экрана, скорости и угла выдува струи, углов отклонения рулевых поверхностей и элементов механизации. Анализ результатов позволяет сделать выводы об эффективности применения поддува к данной компоновочной схеме экраноплана, а также выявить основные особенности изменения ее аэродинамических характеристик при различных параметрах струи, конфигурации и положения экраноплана относительно экрана. Также рассмотрены некоторые особенности летно-технических характеристик экраноплана с учетом влияния струй от воздушного винта. Результаты работы могут быть использованы при проектировании экранопланов. Ключевые слова: экраноплан, аэродинамика экраноплана, аэродинамический поддув, динамическая воздушная подушка This paper presents the primary results of the study of the aerodynamic characteristics of a WIG, with due consideration of the blow and the influence of jets from the propeller, using CFD technologies. WIG of the Tandem scheme is considered as the object of this research. The paper presents a simplified technique for modeling a jet from a propeller. The computational experiment for the study of aerodynamic characteristics was carried out in the ANSYS finite element analysis program. The conditions of the computational experiment provided for changing the kinematic parameters (position of the WIG against the screen), speed of the jet, the angle of the jet blow, and use of wing mechanization (flaps). Analysis of the results leads to conclusions on effectiveness of the blowing application to this layout of the WIG. It also allows to reveal major effects from changing its aerodynamic characteristics with various jet parameters, configuration and position of the WIG against the ground. The paper also considers some of the features of WIG flight performance taking into account the effect of jets from the propeller. Keywords: PAR (Power-augmented Ram), GEV (ground-effect vehicle), WIG (wing-in-ground-effect)

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