Author
Glowienko, R., Derlien, H., Ertunç, Özgür, Delgado, A.
Publication Date
2019-04
Publication Place
-
IOP Publishing
Subject
Synthetic jets, CFD, Turbulence
Type
Periodical
Language
English
Digital
Yes
Manuscript
No
Library
Özyeğin University
Library Asset ID
0169-5983
Record ID
8ddda428-837b-4011-8fae-d7df8b8a7843
Library Location
Mechanical Engineering
Date
2019-04
Sample Text
In this paper, flow characteristics and the transition of synthetic jets are investigated numerically and experimentally. The investigated synthetic jets have a dimensionsless stroke length L-0/d of 146 and 167, an U-0 of 7.3 and 8.35 m s(-1) and a jet Reynolds number Re-U0 of 471 and 539. Novelty of this paper is the extensive analysis and explanation of why synthetic jets with L-0/d > 70 result to transition and turbulent flow: it is shown that the jets exhibit swirl which originates from the cavity. The rotation results in more rapid divergence and deceleration of the free jets. Both processes initially cause disruptions of the primary vortex and the secondary vortices, also vortex breakdown, and ultimately result in jet turbulence. Extension of the laminar region spatially and temporally is possible by increasing the height of the cavity.
DOI
10.1088/1873-7005/aaf498
Cilt
51
