The impact of the ground on flow structure and aerodynamic characteristics of a double delta wing

Mehmet Oguz Tasci; Sergen Tumse; Besir Sahin

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The impact of the ground on flow structure and aerodynamic characteristics of a double delta wing

机译：The impact of the ground on flow structure and aerodynamic characteristics of a double delta wing

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The ground effect (GE) on the formation of the vortical flow over a double delta wing having sweep angles of A = 70°/40° was examined using the Particle Image Velocimetry (P1V) and dye flow visualization methods in this study. Qualitatively and quantitatively measured results were demonstrated for angles of attack, α = 15° and 25° cases in the side and cross-flow planes to reveal the detail of the flow structures. The distance, h between surfaces of the ground and the delta wing normalized with the chord length of the double delta wing, c, was selected as h/c = 0.1, 0.25 0.55, and the ground-free case (GFC). The results demonstrated that the magnitudes of the strake and wing vortices at α = 15° and the coiled-up vortex at α = 25° progressively diminish when the delta wing moves from the free-stream region into the boundary layer region close to the ground surface, h/c = 0.1. Also, the rate of the inboard movement of leading edge vortices towards the wing central axis increases on the pressure surface of the wing as the altitude of the double delta wing is gradually lowered towards the ground surface. The lift coefficient, C_L of the delta wing enhances due to the development of air stagnation and ram pressure between wing and ground surfaces by lowering the level of the double delta wing from the free-stream region into the boundary layer flow region which is strongly influenced by the presence of the ground surface. Also, the drag coefficient, C_D increases more than the lift coefficient, C_L resulting in a deterioration of the lift to drag ratio, C_L/C_D under the ground effect (GE). Finally, an increment in C_L/C_D is much more prominent at lower angles of attack, α regardless of ground effect.

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来源
《Aerospace science and technology》 |2022年第11期|107943.1-107943.17|共17页
作者
Mehmet Oguz Tasci; Sergen Tumse; Besir Sahin;
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作者单位

Dept. of Mechanical Engineering, Cukurova University, 07330, Saricam, Adana, Turkiye;

Dept of Aerospace Engineering, Istanbul Aydin University, Kucukcekmece, Istanbul, Turkiye;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
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关键词
Aerodynamic coefficients; Double delta wing; Dynamic air cushion; Ground effect; Particle image velocimetry;

The impact of the ground on flow structure and aerodynamic characteristics of a double delta wing

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