Compact, high-power synthetic jet actuators for flow separation control

Gilarranz, J. L.; Rediniotis, Othon K.

doi:10.2514/6.2001-737

Cited by 73 publications

(40 citation statements)

References 16 publications

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“…However, it is important to state that initially, due to the difficulty of making walls to separate the flow within the jet exit, only the plenum for each individual piston was separated from each other (see figures 2.18 and 2.19). Preliminary results with this configuration showed that there were still strong interactions between the jets generated by each piston, which were detrimental for the performance of the actuator (Gilarranz and Rediniotis, 2001b). This required the separating walls included in the plenum of the actuator to be extended up to the slot exit, as shown in figures 2.19 and 2.20.…”

Section: Second Generation High-power Synthetic Jet Arravmentioning

confidence: 99%

Synthetic Jet Actuation - Modeling, Actuator Development and Application to Separation Control

Rediniotis¹

2004

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the tir gathering and maintaining the data needed, and completing and reviewing the collection of information. Send commenjs regi of information, including suggestions for reducing the burden, PERFORMING ORGANIZATION NAME(S) AND ADDRESS(ES)Texas Engineering Experiment Station Texas A&M University CoUege Station Texas 77843-3141 This work presents an investigation of synthetic jet actuation for separation control over wings/airfoils, in steady and unsteady flows, the development of hi^-power, compact synthetic jet actuators (SJA) for flow separation control, the modelmg and control of such actuators and the modeling and control of the resulting SJA-controUed aerodynamics and wing/airfoil, respectively. The developed actuator is compact enough to fit in the interior of a NACA0015 profiled wing with a chord of 0.375 m. Test bench experiments showed that the multi-piston actuator array was capable of producing exit velocities of up to 90 m/s for an actuator frequency of 130 Hz. The actuator was placed in a NACA 0015 wmg and tested m a wmd tunnel. An experimental investigation into the effects of a synthetic jet actuator on the performance of the wing, in steady flow, is described. Emphasis is placed on the capabilities of the actoator to control the separation of the flow over the wing at high angles of attack. The investigation included the use of force balance measurements, on -surface flow visualization with oil and tufts, off-surface flow vBualizations with smoke, surface pressure distribution measurements and wake surveys. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)USAF

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Section: Second Generation High-power Synthetic Jet Arravmentioning

confidence: 99%

Synthetic Jet Actuation - Modeling, Actuator Development and Application to Separation Control

Rediniotis¹

2004

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“…Synthetic jet actuators (SJA) provide a novel means of applying flow control and their potential application for the effective delay of boundary layer separation on aircraft has been the focus of intense research in recent years (Smith and Glezer, 1998;Crook and Wood, 2001;Gilarranz and Rediniotis, 2001;Glezer and Amitay, 2002). One of the reasons for this is due to their unique ability to impart additional momentum on a fluid region from which it was originally synthesised without a net mass addition, therefore requiring no bleed air supply and complex piping.…”

Section: Introductionmentioning

confidence: 99%

The near wall effect of synthetic jets in a boundary layer

Jabbal

Zhong

2008

International Journal of Heat and Fluid Flow

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An experimental investigation to analyse the qualitative near wall effect of synthetic jets in a laminar boundary layer has been undertaken for the purpose of identifying the types of vortical structures likely to have delayed separation on a 2D circular cylinder model described in this paper. In the first instance, dye visualisation of the synthetic jet was facilitated in conjunction with a stereoscopic imaging system to provide a unique quasi three-dimensional identification of the vortical structures. Secondly, the impact of synthetic jet structures along the wall was analysed using a thermochromic liquid crystal-based convective heat transfer sensing system in which, liquid crystals change colour in response to the thermal footprints of a passing flow structure. Of the different vortical structures produced as a result of varying actuator operating and freestream conditions, the footprints of hairpin vortices and stretched vortex rings revealed a marked similarity with the oil flow pattern of a vortex pair interacting with the separation line on the cylinder hence suggesting that either of these structures was responsible in delaying separation. Conditions were established for the formation of the different synthetic jet structures in non-dimensional parameter space.

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“…5 Half width (diameter) of jet d 1 Inner diameter of annular slot d 2 Outer Figure 1 shows a schematic view of a jet nozzle with an annular synthetic jet actuator. Figure 1(a) is a cross section of the actuator.…”

Section: Nomenclature Dmentioning

confidence: 99%

“…In recent years, a synthetic jet actuator has been shown to be a useful tool for flow control, especially separation control (1) (2) and flow vectoring (3) . A synthetic jet actuator known also as a zero net-mass-flux actuator produces an alternating flow through a slot or an orifice.…”

Section: Introductionmentioning

confidence: 99%

Agitated Turbulent Flowfield of A Circular Jet with An Annular Synthetic Jet Actuator

Koso

Kinoshita

2008

JFST

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An agitated circular turbulent jet with a coaxial annular synthetic jet actuator is investigated experimentally. The mean and turbulent velocities are measured by a hot-wire anemometer at a jet Reynolds number of 6400. The measured iso-velocity contour maps indicate that the width of the circular jet is increased even when the intensity of the alternating flow is too weak to generate a synthetic jet. This can be attributed to the periodic disturbances by the actuator, which agitates the instability in the initial shear layer and displaces the shear layer growth upstream. With a strong agitation so as to generate a strong synthetic jet by itself, the agitated jet has the higher velocity and the larger width than those of unagitated jet. With this agitation, the momentum of the agitated jet is increased and its increment is equal to the momentum of the synthetic jet. Smoke visualization shows clearly that the actuator enhances the dispersion of primary jet fluids. These results are compared with those of a jet at a low Reynolds number of 3100 and it is found that the mixing enhancement is qualitatively same for both Reynolds numbers, but the weak agitation is more effective in the low Reynolds number jet.

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Compact, high-power synthetic jet actuators for flow separation control

Cited by 73 publications

References 16 publications

Synthetic Jet Actuation - Modeling, Actuator Development and Application to Separation Control

Synthetic Jet Actuation - Modeling, Actuator Development and Application to Separation Control

The near wall effect of synthetic jets in a boundary layer

Agitated Turbulent Flowfield of A Circular Jet with An Annular Synthetic Jet Actuator

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