Numerical Study of Virtual Aerodynamic Shape Modification of an Airfoil Using a Synthetic Jet Actuator

2003 ◽  
Author(s):  
Jose Vadillo ◽  
Ramesh Agarwal ◽  
Andrew Cary ◽  
William Bower
Keyword(s):  
Numerical Study ◽  
Synthetic Jet ◽  
Shape Modification ◽  
Synthetic Jet Actuator ◽  
Aerodynamic Shape

2D numerical study of circular synthetic jets in quiescent flows

2005 ◽  
Vol 109 (1092) ◽  
pp. 89-97 ◽  
Author(s):  
H. Tang ◽  
S. Zhong
Keyword(s):  
Experimental Data ◽  
Numerical Study ◽  
Initial Study ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Neutral Position ◽  
Computational Results ◽  
Synthetic Jet Actuator ◽  
Field Velocity ◽  
Turbulent Models

Abstract2D numerical simulations of flows generated by a synthetic jet actuator with a circular orifice were conducted at two different diaphragm displacement settings, one representing a typical laminar case and the other a fully turbulent case. The flow in the cavity was included in the computation in order to provide more accurate predictions. A velocity boundary condition was applied at the neutral position of the diaphragm to account for its temporal deformation. Comparisons were made between the computational results and existing PIV and hot-wire data in terms of the time sequence of the velocity vector field, velocity variations in space and with time. It is found that computational results for the laminar case agree well with the experimental data. Four turbulent models were tested for the fully turbulent case. It was found that the predictions using the RNG κ-ε and Standard k-ε models were reasonably close to the experimental data. This initial study has produced some encouraging evidence for the capacity of FLUENT in simulating the key features of synthetic jets.

A Criterion for the Formation of Micro Synthetic Jets

2004 ◽  
Author(s):  
V. Timchenko ◽  
J. Reizes ◽  
E. Leonardi ◽  
G. de Vahl Davis
Keyword(s):  
Numerical Study ◽  
Reynolds Numbers ◽  
Synthetic Jet ◽  
Synthetic Jets ◽  
Frequency Range ◽  
Jet Formation ◽  
Synthetic Jet Actuator ◽  
Computational Data ◽  
Flow Device ◽  
New Criterion

A synthetic jet actuator is a zero net mass flow device, which under appropriate conditions generates a continuous jet always directed away from the orifice. Because of limited experimental and computational data on micro-sized jets, there is a need for a criterion to determine the onset of the sustained jet regime. A numerical study of axisymmetric micro synthetic jets for a frequency range from 250 to 50,000 Hz, orifice diameters range from 20 to 200 μm, and Reynolds numbers from 6.5 to 35 has been performed in order to identify a general jet formation criterion. The parametric study has allowed us to develop a new criterion for the onset of micro synthetic jets with Stokes numbers less than 7.

An experimental and numerical study of synthetic jet flow

2001 ◽  
Vol 105 (1043) ◽  
pp. 41-49 ◽  
Author(s):  
S. G. Mallinson ◽  
J. A. Reizes ◽  
G. Hong
Keyword(s):  
Numerical Study ◽  
Jet Flow ◽  
Synthetic Jet ◽  
Ambient Fluid ◽  
Self Similarity ◽  
Turbulent Dissipation ◽  
Synthetic Jet Actuator ◽  
Circular Orifice ◽  
Computational Predictions ◽  
Good Agreement

AbstractThe flow generated by a synthetic jet actuator with a circular orifice is investigated experimentally and computationally. The experimental data and computational predictions are in fair to good agreement with each other and with the theory for a steady turbulent jet. It is found, however, that the synthetic jet establishes itself much more rapidly than the steady jet, primarily because of turbulent dissipation. The oscillatory nature of synthetic jet flow also gives rise to a much greater entrainment of ambient fluid compared with the case of a steady jet. Finally, self-similarity seems to be established when the oscillations introduced by the actuator are reduced to negligible levels.

Numerical study of nozzle design for the hybrid synthetic jet actuator

2015 ◽  
Vol 232 ◽  
pp. 172-182 ◽  
Author(s):  
S.-S. Hsu ◽  
Y.-J. Chou ◽  
Z. Trávníček ◽  
C.-F. Lin ◽  
A.-B. Wang ◽  
...  
Keyword(s):  
Numerical Study ◽  
Synthetic Jet ◽  
Nozzle Design ◽  
Synthetic Jet Actuator

Numerical Study on Plasma-Based Control of Flow over a Square Cylinder

2011 ◽  
Vol 110-116 ◽  
pp. 4351-4357
Author(s):  
Dong Joo Kim ◽  
Jungwoo Kim
Keyword(s):  
Flow Control ◽  
Numerical Study ◽  
Synthetic Jet ◽  
Plasma Actuators ◽  
Immersed Boundary ◽  
Rear Side ◽  
Bluff Bodies ◽  
Cylinder Wake ◽  
Square Cylinder ◽  
Synthetic Jet Actuator

Over the past decade, a lot of attention has been paid to plasma actuators because they are useful tools for flow control. Previous successes with plasma actuators include drag and noise reductions from a circular cylinder, one of representative bluff bodies, mainly through separation delay. However, to the best of authors’ knowledge, no attempt has been made to examine its capability to control square cylinder wake with fixed separation points. The purpose of this study is to numerically investigate whether or not the square cylinder wake can be controlled by means of plasma actuators. In particular, a linear plasma synthetic jet actuator is adopted and attached to the rear side of the cylinder. In this study, we use an immersed boundary method combined with an empirical plasma model for plasma-based flow control. The present method is second order accurate in time and space. Results show that the wake behind the square cylinder can be controlled effectively when the plasma-induced force is strong enough. With the plasma actuator on, the mean drag is reduced and the Karman vortex shedding is alleviated because the induced jet increases the base pressure and prevents the separating shear layers from interacting with each other.

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