Effect of ground on flow characteristics and aerodynamic performance of a non-slender delta wing
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Tarih
2021
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Elsevier France-Editions Scientifiques Medicales Elsevier
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
The aerodynamic performance and the structure of vortical flow on a delta wing are affected by the influence of the ground in take-off and landing stages. In this context, the effect of the ground on a delta wing having a sweep angle of 40 degrees was investigated by employing Particle Image Velocimetry (PIV), aerodynamic force measuring system and the dye flow visualization technique. Flow characteristics of delta wing were examined under two different angles of attack, alpha = 8 degrees and 11 degrees and variation of the distance between trailing edge of the wing and ground, h normalized with the root chord length, c of the wing. It was observed that the existence of the ground attenuates the magnitude of peak values of primary and secondary vortices due to incomplete development of vortices. The ground effect caused the outboard movement of the leading-edge vortex in a spanwise direction as well as an increase in the size of vortices. Furthermore, the presence of the ground induced a decrease in Strouhal number, St due to the slowing down of vortex formation. Lift and drag coefficient, C-L, and C-D of the delta wing were observed to increase with descending from unbounded flight region into ground effect region. Finally, it was found that C-L/C-D increases by reducing the distance between ground and wing, h/c, and a rise of C-L/C-D is much more effective under the lower angles of attack, alpha. (C) 2020 Elsevier Masson SAS. All rights reserved.
Açıklama
Anahtar Kelimeler
Aerodynamic coefficients, Delta wing, Ground effect, Particle Image Velocimetry (PIV), Vortical flow structure
Kaynak
Aerospace Science and Technology
WoS Q Değeri
Q1
Scopus Q Değeri
Q1
Cilt
110
