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

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.

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

Secondary flow structures due to interaction between a finite-span synthetic jet and a 3-D cross flow

2011 ◽  
Vol 23 (9) ◽  
pp. 094104 ◽  
Author(s):  
Yossef Elimelech ◽  
Joseph Vasile ◽  
Michael Amitay
Keyword(s):  
Secondary Flow ◽  
Cross Flow ◽  
Synthetic Jet ◽  
Flow Structures ◽  
Finite Span

Vortex ring bifurcation and secondary structures in a finite-span synthetic jet

2020 ◽  
Vol 903 ◽  
Author(s):  
Joseph C. Straccia ◽  
John A. N. Farnsworth
Keyword(s):  
Vortex Ring ◽  
Secondary Structures ◽  
Synthetic Jet ◽  
Finite Span

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