| Issue |
Volume 7, 2015
Progress in Flight Physics – Volume 7
|
|
|---|---|---|
| Page(s) | 147 - 168 | |
| Section | Flow control | |
| DOI | https://doi.org/10.1051/eucass/201507147 | |
| Published online | 08 June 2015 | |
The effects of actuation frequency on the separation control over an airfoil using a synthetic jet
1
University of Tokyo Sagamihara,
Kanagawa
252-5210,
Japan
2
Ryoyu Systems Co. Ltd Nagoya,
Aichi
455-0024,
Japan
3
Institute of Space and Astronautical Science, JAXA
Sagamihara, Kanagawa
252-5210,
Japan
The simulation of separation control using a synthetic jet (SJ) is conducted around an NACA (National Advisory Committee for Aeronautics) 0015 airfoil by large-eddy simulation (LES) with a compact difference scheme. The synthetic jet is installed at the leading edge of the airfoil and the effects of an actuation frequency F+ (normalized by chord length and velocity of freestream) are observed. The lift-drag coefficient is recovered the most for F+ = 6. The relationship between momentum addition by turbulent mixing and large vortex structures is investigated using a phase-averaging procedure based on F+. The Reynolds shear stress is decomposed into periodic and turbulent components where the turbulent components are found to be dominant on the airfoil. The strong turbulent components appear near the large vortex structures that are observed in phase- and span-averaged flow fields.
© Owned by the authors, published by EDP Sciences, 2015