Contribution of large-scale vortex and fine-scale turbulent structure in separated flow control using DBD plasma actuator

Kento Asano, Kengo Asada, Hiroki Kato, Makoto Sato, Taku Nonomura, Akira Oyama, Kozo Fujii

研究成果: 書籍の章/レポート/Proceedings会議への寄与査読

1 被引用数 (Scopus)

抄録

Contribution of large-scale vortex and fine-scale turbulent structure in separated flow control by DBD plasma actuator are investigated using computational results of large-eddy simulation and two-dimensional simulation. The Reynolds number based on chord length is 63, 000 and 10, 000. The angle of attack is 14 deg. for Re=63, 000 and 10 deg. for Re=10, 000. The DBD plasma actuator is set at the 5% chord length from the leading edge of NACA0015 airfoil and operated in burst mode. At the Re=63, 000, the spanwise vortex breaks down into the turbulent small-scale vortices. However, the spanwise vortices in the two-dimensional simulation maintained their structure while they convect to the downstream. Comparing the lift-to-drag ratio, similar values are obtained in the F+ = 1 and F+ = 6 case, while the F+ = 6 case shows higher than the F+ = 1 case in the large-eddy simulation. These results indicate that the effect of the small-scale vortices are important to reduce the recirculation region of the separated flow and improve the aerodynamic performance in the F+ = 6 case. On the other hand, at the Re=10, 000, similar trend of the flow fields are obtained from the large-eddy simulation and the two-dimensional simulation. This implies that the effect of the small-scale vortices to the separation control is small at this Reynolds number.

本文言語英語
ホスト出版物のタイトル45th AIAA Fluid Dynamics Conference
出版社American Institute of Aeronautics and Astronautics Inc, AIAA
ページ1-16
ページ数16
ISBN(印刷版)9781624103629
DOI
出版ステータス出版済み - 2015
イベント45th AIAA Fluid Dynamics Conference, 2015 - Dallas, 米国
継続期間: 2015 6月 222015 6月 26

出版物シリーズ

名前45th AIAA Fluid Dynamics Conference

会議

会議45th AIAA Fluid Dynamics Conference, 2015
国/地域米国
CityDallas
Period15/6/2215/6/26

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