Interaction of a single synthetic jet with a finite aspect ratio circular cylinder

Edward Paisley DeMauro, Chia Min Leong, Michael Amitay

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

3 Citations (Scopus)

Abstract

The interaction of a finite-span synthetic jet with a finite span low aspect ratio cylinder is explored experimentally using Stereoscopic Particle Image Velocimetry (SPIV) measurements in the near wake and along the surface of the cylinder in order to understand how local small changes to the near surface flow field result in large alterations to the wake structure. A single synthetic jet located at mid-span and azimuthally at θ = 90 ° with respect to the freestream velocity was oriented such that the long dimension of its orifice was parallel to the freestream direction. Without flow control, downwash from the free end dominates the near wake of the cylinder, resulting in suppression of the von-Kármán vortex street and the creation of a symmetrically-shedding arch-type vortex. Once the synthetic jet is actuated, the interaction between the synthetic jet and the local near-surface flow induces large-scale global changes to the flow field, altering the circulation and a narrowed wake, while also creating a vortex dislocation along one leg of the arch-type vortex outboard of the synthetic jet orifice. Above the jet orifice, a pair of counter-rotating streamwise vortices are formed, which entrain flow from the separated region inboard of the jet orifice and delay separation outboard of the jet orifice, creating the narrowed wake and vortex dislocation seen in the near wake measurements.

Original languageEnglish (US)
Title of host publication6th AIAA Flow Control Conference 2012
StatePublished - Dec 1 2012
Externally publishedYes
Event6th AIAA Flow Control Conference 2012 - New Orleans, LA, United States
Duration: Jun 25 2012Jun 28 2012

Publication series

Name6th AIAA Flow Control Conference 2012

Other

Other6th AIAA Flow Control Conference 2012
CountryUnited States
CityNew Orleans, LA
Period6/25/126/28/12

Fingerprint

circular cylinders
aspect ratio
orifices
near wakes
vortices
interactions
wakes
arches
flow distribution
downwash
vortex streets
low aspect ratio
particle image velocimetry
counters
retarding

All Science Journal Classification (ASJC) codes

  • Aerospace Engineering
  • Fluid Flow and Transfer Processes
  • Control and Systems Engineering

Cite this

DeMauro, E. P., Leong, C. M., & Amitay, M. (2012). Interaction of a single synthetic jet with a finite aspect ratio circular cylinder. In 6th AIAA Flow Control Conference 2012 (6th AIAA Flow Control Conference 2012).
DeMauro, Edward Paisley ; Leong, Chia Min ; Amitay, Michael. / Interaction of a single synthetic jet with a finite aspect ratio circular cylinder. 6th AIAA Flow Control Conference 2012. 2012. (6th AIAA Flow Control Conference 2012).
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DeMauro, EP, Leong, CM & Amitay, M 2012, Interaction of a single synthetic jet with a finite aspect ratio circular cylinder. in 6th AIAA Flow Control Conference 2012. 6th AIAA Flow Control Conference 2012, 6th AIAA Flow Control Conference 2012, New Orleans, LA, United States, 6/25/12.

Interaction of a single synthetic jet with a finite aspect ratio circular cylinder. / DeMauro, Edward Paisley; Leong, Chia Min; Amitay, Michael.

6th AIAA Flow Control Conference 2012. 2012. (6th AIAA Flow Control Conference 2012).

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

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DeMauro EP, Leong CM, Amitay M. Interaction of a single synthetic jet with a finite aspect ratio circular cylinder. In 6th AIAA Flow Control Conference 2012. 2012. (6th AIAA Flow Control Conference 2012).