Journal
CHINESE JOURNAL OF AERONAUTICS
Volume 33, Issue 12, Pages 3125-3137Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.cja.2020.05.015
Keywords
Drag reduction; Large Eddy simulation; Relaminarization; Riblet; Sweep angle
Categories
Funding
- National Natural Science Foundation of China [91852108, 11872230]
- Open Fund of Key Laboratory of Icing and Anti/De-icing of China [IADL20190201]
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This paper studies the riblet drag reduction effect for an infinite swept wing under a low Reynolds number using a large-eddy simulation. The results show that the drag reduction ratio is not linear under different sweep angles. The maximum drag reduction ratio in this study is 9.5% for a wing with a 45 degrees sweep angle. The local surface streamline angle and turbulence quantities are calculated to analyze the drag reduction mechanism. The results demonstrate that the riblets considerably suppress the Reynolds stresses above the wing upper surface, while the turbulence kinetic energy in the near wake is increased. A possible relaminarization phenomenon is observed at the middle part of the wing. Quasi-two-dimensional flow structures are observed near the wall, and a peak frequency is considered as the dominant frequency of the region. (c) 2020 Chinese Society of Aeronautics and Astronautics. Production and hosting by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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