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Deflector effect on flow behavior and drag of an Ahmed body under crosswind conditions

The Hung Faculty of Aerospace Engineering, Le Quy Don Technical University, 236 Hoang Quoc Viet, Bac Tu Liem, Hanoi, Viet Nam|
Keigo (57201636493) | Takuji (57898694000); Shimizu | Takanori (36839769000); Nakashima Technical Research Center, Mazda Motor Corporation, 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima, 730-8670, Japan| Masayuki (16238287200); Uchida Graduate School of Advanced Sciences and Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima, 739-8527, Japan| Masato (57982278200); Anyoji Reseach Institute for Applied Mechanics (RIAM), Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka, 816-8580, Japan| Tran (57983922800); Hijikuro Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga-Koen, Kasuga, Fukuoka, 816-8580, Japan|

Journal of Wind Engineering and Industrial Aerodynamics Số , năm 2022 (Tập 231, trang -)

ISSN: 1676105

ISSN: 1676105

DOI: 10.1016/j.jweia.2022.105238

Tài liệu thuộc danh mục:



Từ khóa: Aerodynamic drag; Flow structure; Reynolds number; Vortex flow; Ahmed body; Ahmed models; Condition; Flow behaviours; Flow drag; Longitudinal vortices; On flow; Separation bubble; Surface flow; Yaw angles; Pressure distribution
Tóm tắt tiếng anh
This study investigates the effect of a deflector on Ahmed model drag and the flow on the slant during steady crosswind conditions by experimental methods at a based-height Reynolds number of 2.45 � 105. The length deflector is 0.09 times the length of the slant. The deflector was fixed at the leading edge of the slant with an upward angle of 5� to the horizontal axis. Force, pressure, and global skin-friction measurements were conducted to understand the relation between drag, pressure distribution, and flow fields on the slant surface. The results showed that the deflector reduces aerodynamic drag at low yaw angles. This result is due to the breakdown structure of longitudinal vortexes and the separation bubble, which leads to fully separated flow on the leading edge of the slant. However, at yaw angles above 8�, a large reversed flow region forms on the slant and the drag of the model increases. A similar flow structure on the slant is observed for yaw angles of 12� and 15�. Conversely, the model lift is reduced with the deflector at all yaw angles tested. Detailed pressure distribution and complex flow structure on the slant provide insight in this study. � 2022 Elsevier Ltd

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