The manipulation of large- and small-scales in coaxial jets using synthetic jet actuators

Davis, Stan C.; Glezer, Ari

doi:10.2514/6.2000-403

Cited by 33 publications

(13 citation statements)

References 2 publications

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“…Ritchie and Seitzman (2000) performed experiments in which they controlled fiiel-air mixing by means of an array of sjoithetic jets placed in the periphery of two coaxial jets. Also, Davis and Glezer (2000) showed the ability of a synthetic jet array to manipulate large and small-scale structures in coaxial jets, which led to an enhancement of the mixing process within the jets.…”

Section: Synthetic Jet Actuators (Sjas)mentioning

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: Synthetic Jet Actuators (Sjas)mentioning

confidence: 99%

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

Rediniotis¹

2004

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“…Aerodynamic flow control over an unconventional airfoil has also been demonstrated by Amitay et al, [6] to enhance post-stall performance with actuators operating at fi:equencies higher than the characteristic frequency of the airfoil. The synthetic jets are also being investigated for possible applications to improve heat transfer and drag reduction and to enhance mixing [7] in combustors, etc. The present analysis involves these synthetic jets for projectile aerodynamic control.…”

Section: Introductionmentioning

confidence: 99%

Unsteady Numerical Simulations of Subsonic Flow over a Projectile with Jet Interaction

Sahu

2003

41st Aerospace Sciences Meeting and Exhibit

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Public rqjorting burden for this collection of infonnarion is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining flie data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Informahon Operations and Reports (0704-01 Sg), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Re^wndents should be aware that notwithManding any other provision of law, no person shall be subject to any pmalty for failing to comply with a collection of * information if It docs not display a currently valid OMB control number.iplay a currently PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)May 2003 ARL-TR-297510. SPONSOR/MONITOR'S ACRONYM{S) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTWY NOTES ABSTRACTThis report describes a computational study undertaken to consider the aerodynamic effect of synthetic jets as a means to provide the control authority needed to maneuver a projectile at low subsonic speeds. The time-accurate Navier-Stokes computational technique has been used to obtain numerical solutions for the unsteady jet interaction flow field for a projectile at a subsonic speed, Mach = 0.11, and several angles of attack from 0° to 4°. Qualitative flow field features show the interaction of the timedependent jet with the free stream flow. Numerical results show the effect of the Jet on the flow field, surface pressures and aerodynamic coefficients. Unsteady numerical results have been obtained for a two-dimensional jet flow and compared with experimental data for validation. The same unsteady jet modeling technique h^ been applied to a subsonic projectile. These numerical results are being assessed to determine if synthetic jets can be used to provide the control authority needed for maneuvering munitions to hit the targets with precision.

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“…Synthetic jet, one of the active flow control techniques [1][2][3][4][5], can be used for drag reduction, noise abatement, separation control [6], jet thrust vectoring [7] and mixing enhancement [7][8][9][10][11], etc. The experimental investigation of mixing in coaxial jets using synthetic jet actuators (SJA) was reported by Davis [8,9] and Ritchie et al [10]. They applied an azimuthal array of co-flowing synthetic jet actuators to the test.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of high-power synthetic jet actuator flowfield and its influence on mixing control

2008

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Detailed two-dimensional unsteady numerical simulation is carried out to investigate a high-power synthetic jet actuator flow field and its design characteristic. Simultaneously, mixing control mechanism of coaxial jets with actuators is also studied. Firstly, excitation frequency (rotating speed), piston displacement and its exit slot width have effect on the controlling ability and controlling efficiency of actuator. With the invariable model and concerned parameters, the actuator becomes more desirable as the rotating speed increases. Average velocity and maximal velocity at the actuator exit section increase as the piston displacement enlarges or the exit slot width decreases. But the actuator does not always exhibit good performance with the narrower exit. Secondly, the synthetic jets also have the "push" effect on the coaxial jets, which results in the fluctuation of vorticity and temperature distribution of mixing flowfield. Finally, the employment of synthetic jet actuator can achieve mixing enhancement significantly.

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The manipulation of large- and small-scales in coaxial jets using synthetic jet actuators

Cited by 33 publications

References 2 publications

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

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

Unsteady Numerical Simulations of Subsonic Flow over a Projectile with Jet Interaction

Numerical simulation of high-power synthetic jet actuator flowfield and its influence on mixing control

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