## Abstract

Aerodynamic characteristics of a thin airfoil flying over and in proximity to a wavy-wall surface such as uneven ground or water surface were analyzed two-dimensionally by lifting surface theory in the simplest fundamental case only. The theoretical equation was simplified assuming that flow is inviscid and incompressible, all disturbances are sufficiently small, the wall surface is sinusoidal and rigid, and the wall moves in the same direction as free stream but with a constant velocity different from that of the stream. The equation was verified in the case where an airfoil with a constant angle-of-attack flies over a flat ground surface, and calculations were made with a set of important parameters such as mean airfoil height from the wall, wave length of the wall surface and the wall velocity. The whole effect of wavy wall proximity was divided into the first and second-order ground effects. The first one was just Kemp{prime}s upwash problem, and the second one was revealed through the present study which becomes significant for lower airfoil heights. 18 refs., 5 figs.

Ando, S;

^{[1] }Ichikawa, M^{[2] }- Nagoya University, Nagoya (Japan)
- Government Industrial Research Institute, Nagoya, Nagoya (Japan)

## Citation Formats

Ando, S, and Ichikawa, M.
Aerodynamics of a thin airfoil flying over and in proximity to a wavy-wall surface. ; Lifting surface theory.
Japan: N. p.,
1991.
Web.

Ando, S, & Ichikawa, M.
Aerodynamics of a thin airfoil flying over and in proximity to a wavy-wall surface. ; Lifting surface theory.
Japan.

Ando, S, and Ichikawa, M.
1991.
"Aerodynamics of a thin airfoil flying over and in proximity to a wavy-wall surface. ; Lifting surface theory."
Japan.

@misc{etde_5116010,

title = {Aerodynamics of a thin airfoil flying over and in proximity to a wavy-wall surface. ; Lifting surface theory}

author = {Ando, S, and Ichikawa, M}

abstractNote = {Aerodynamic characteristics of a thin airfoil flying over and in proximity to a wavy-wall surface such as uneven ground or water surface were analyzed two-dimensionally by lifting surface theory in the simplest fundamental case only. The theoretical equation was simplified assuming that flow is inviscid and incompressible, all disturbances are sufficiently small, the wall surface is sinusoidal and rigid, and the wall moves in the same direction as free stream but with a constant velocity different from that of the stream. The equation was verified in the case where an airfoil with a constant angle-of-attack flies over a flat ground surface, and calculations were made with a set of important parameters such as mean airfoil height from the wall, wave length of the wall surface and the wall velocity. The whole effect of wavy wall proximity was divided into the first and second-order ground effects. The first one was just Kemp{prime}s upwash problem, and the second one was revealed through the present study which becomes significant for lower airfoil heights. 18 refs., 5 figs.}

journal = {Transactions of the Japan Society for Aeronautical and Space Sciences; (Japan)}

volume = {34:103}

journal type = {AC}

place = {Japan}

year = {1991}

month = {May}

}

title = {Aerodynamics of a thin airfoil flying over and in proximity to a wavy-wall surface. ; Lifting surface theory}

author = {Ando, S, and Ichikawa, M}

abstractNote = {Aerodynamic characteristics of a thin airfoil flying over and in proximity to a wavy-wall surface such as uneven ground or water surface were analyzed two-dimensionally by lifting surface theory in the simplest fundamental case only. The theoretical equation was simplified assuming that flow is inviscid and incompressible, all disturbances are sufficiently small, the wall surface is sinusoidal and rigid, and the wall moves in the same direction as free stream but with a constant velocity different from that of the stream. The equation was verified in the case where an airfoil with a constant angle-of-attack flies over a flat ground surface, and calculations were made with a set of important parameters such as mean airfoil height from the wall, wave length of the wall surface and the wall velocity. The whole effect of wavy wall proximity was divided into the first and second-order ground effects. The first one was just Kemp{prime}s upwash problem, and the second one was revealed through the present study which becomes significant for lower airfoil heights. 18 refs., 5 figs.}

journal = {Transactions of the Japan Society for Aeronautical and Space Sciences; (Japan)}

volume = {34:103}

journal type = {AC}

place = {Japan}

year = {1991}

month = {May}

}