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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Title of host publication45th AIAA Fluid Dynamics Conference
PublisherAmerican Institute of Aeronautics and Astronautics Inc, AIAA
Pages1-16
Number of pages16
ISBN (Print)9781624103629
DOIs
Publication statusPublished - 2015
Externally publishedYes
Event45th AIAA Fluid Dynamics Conference, 2015 - Dallas, United States
Duration: 2015 Jun 222015 Jun 26

Publication series

Name45th AIAA Fluid Dynamics Conference

Other

Other45th AIAA Fluid Dynamics Conference, 2015
CountryUnited States
CityDallas
Period15/6/2215/6/26

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Aerospace Engineering

Fingerprint Dive into the research topics of 'Contribution of large-scale vortex and fine-scale turbulent structure in separated flow control using DBD plasma actuator'. Together they form a unique fingerprint.

Cite this