Vortex Formation of a Finite Span Synthetic Jet

2012 ◽  
Author(s):  
Tyler Van Buren ◽  
Michael Amitay ◽  
Edward Whalen
Keyword(s):  
Vortex Formation ◽  
Synthetic Jet ◽  
Finite Span

Vortex formation of a finite-span synthetic jet: High Reynolds numbers

2014 ◽  
Vol 26 (1) ◽  
pp. 014101 ◽  
Author(s):  
Tyler Van Buren ◽  
Edward Whalen ◽  
Michael Amitay
Keyword(s):  
Vortex Formation ◽  
Reynolds Numbers ◽  
Synthetic Jet ◽  
Finite Span ◽  
High Reynolds Numbers ◽  
High Reynolds

Vortex formation of a finite-span synthetic jet: effect of rectangular orifice geometry

2014 ◽  
Vol 745 ◽  
pp. 180-207 ◽  
Author(s):  
Tyler Van Buren ◽  
Edward Whalen ◽  
Michael Amitay
Keyword(s):  
Aspect Ratio ◽  
Near Field ◽  
Vortex Formation ◽  
Synthetic Jet ◽  
Stereoscopic Particle Image Velocimetry ◽  
Flow Structures ◽  
Geometrical Parameters ◽  
Neck Length ◽  
Finite Span ◽  
Aspect Ratios

AbstractThe formation and evolution of flow structures of a finite-span synthetic jet issuing into a quiescent flow were investigated experimentally using stereoscopic particle image velocimetry (SPIV). The effect of two geometrical parameters, the orifice aspect ratio and the neck length, were explored at a Strouhal number of 0.115 and a Reynolds number of 615. Normalized orifice neck lengths of 2, 4 and 6 and aspect ratios of 6, 12, and 18 were examined. It was found that the effect of the aspect ratio is much larger than the effect of the neck length, and as the aspect ratio increases the size of the edge vortices decreases and the presence of secondary structures is more evident. Moreover, axis switching was observed and its streamwise location increases as the aspect ratio increases. The effect of the neck length on the flow structures and the evolution of the synthetic jet was found to be secondary, where the effect was only in the very near field (i.e. close to the jet’s orifice).

Interaction of a finite-span synthetic jet near the tip of a sweptback wing

2015 ◽  
Vol 27 (6) ◽  
pp. 067102 ◽  
Author(s):  
Joseph D. Vasile ◽  
Michael Amitay
Keyword(s):  
Synthetic Jet ◽  
Finite Span

VORTEX FORMATION IN A LOW ASPECT RATIO SYNTHETIC JET

2020 ◽  
Vol 27 (2) ◽  
pp. 117-141
Author(s):  
Jyoti Gupta ◽  
S. S. G. Satish ◽  
Arun K. Saha
Keyword(s):  
Aspect Ratio ◽  
Vortex Formation ◽  
Synthetic Jet ◽  
Low Aspect Ratio

Three-dimensional interactions between a finite-span synthetic jet and a crossflow

2011 ◽  
Vol 671 ◽  
pp. 254-287 ◽  
Author(s):  
ONKAR SAHNI ◽  
JOSHUA WOOD ◽  
KENNETH E. JANSEN ◽  
MICHAEL AMITAY
Keyword(s):  
Three Dimensional ◽  
Particle Image Velocimetry Data ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Physical Parameters ◽  
Mean Flow ◽  
Cross Sectional ◽  
Finite Span ◽  
Blowing Ratio ◽  
Ratio Range

A complementary experimental and numerical investigation was performed to study the three-dimensional flow structures and interactions of a finite-span synthetic jet in a crossflow at a chord-based Reynolds number of 100,000 and a 0° angle of attack. Six blowing ratios in the range of 0.2–1.2 were considered. Experiments were conducted on a finite wing with a cross-sectional profile of NACA 4421, where particle-image velocimetry data were collected at the centre jet. To complement the experiments, three-dimensional numerical simulations were performed, where the numerical set-up matched not only the physical parameters (e.g. free stream) but also the physical dimensions (e.g. orientation and location of the jet. For the low blowing ratio cases, spatial non-uniformities developed, due to the finite span of the slit, which led to the formation of small and organized secondary structures or a streak-like pattern in the mean flow. On the other hand, for the high blowing ratio range, turbulent vortical structures were dominant, leading to larger spanwise structures, with a larger spanwise wavelength. Moreover, the phase-locked flow fields exhibited a train of counter-rotating coherent vortices that lifted off the surface as they advected downstream. In the mid-blowing ratio range, combined features of the low range (near the slit) and high range (in downstream locations) were found, where a pair of counter-rotating vortices issued in the same jet cycle collided with each other. In all cases, the spanwise extent of the secondary coherent structures reduced with downstream distance with a larger decrease at higher blowing ratios. Similar observations were made in earlier studies on finite-span synthetic jets in quiescent conditions.

352 Vortex Formation of Synthetic Jet

2008 ◽  
Vol 2008 (0) ◽  
pp. 79-80
Author(s):  
Kiyoshi Otani ◽  
Tatsuya Hayashi
Keyword(s):  
Vortex Formation ◽  
Synthetic Jet
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