Flow field characterization of a jet and vortex actuator

Lachowicz, Jason T.; Yao, Chung-Sheng; Wlezien, R. W.

doi:10.1007/s003480050324

Cited by 14 publications

(15 citation statements)

References 12 publications

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“…The non-dimensional parameters governing the JaVA were derived in Lachowicz et al (1999). The analysis assumed 2D incompressible flow, a fixed narrow slot width, and a characteristic velocity equal to the actuator plate peak velocity.…”

Section: Resultsmentioning

confidence: 99%

“…The experimental configuration of the JaVA is discussed in detail by Lachowicz et al (1999). All previously published results for the JaVA used a sine wave to drive the actuator plate.…”

Section: Approach Flow Control Actuatormentioning

confidence: 99%

“…The 2D computational results showed, qualitatively, that a jet emerges from either slot depending on the relative amplitude and frequency of actuation. Lachowicz et al (1998Lachowicz et al ( , 1999 characterized, in detail, the JaVA flow. In still air, it was found that several flow fields were produced by the JaVA (wall jet, free jet, and vortex flow).…”

Section: Introductionmentioning

confidence: 99%

“…the aircraft signature. The Jet and Vortex Actuator or JaVA (Lachowicz et al, , 1999 is one type of zero-netmass flux actuator. Compared with other zero-netmass flux actuators such as the synthetic jet (Amitay et al, 1998), the mechanisms of generating vorticity are different.…”

Section: Introductionmentioning

confidence: 99%

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Physical Analysis and Scaling of a Jet and Vortex Actuator

Jason

Yao

Ronald

2001

Journal of Aircraft

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Our previous studies have shown that the Jet and Vortex Actuator generates free-jet, wall-jet, and nearwall vortex flow fields. That is, the actuator can be operated in different modes by simply varying the driving fiequency andor amplitude. For this study, variations are made in the actuator plate and wide-slot widths and sine/asymmetrical actuator plate input forcing (drivers) to further study the actuator induced flow fields. Laser sheet flow visualization, particleimage velocimetry, and laser velocimetry are used to measure and characterize the actuator induced flow fields. Laser velocimetry measurements indicate that the vortex strength increases with the driver repetition rate for a fmed actuator geometry (wide slot and plate width). For a given driver repetition rate, the vortex strength increases as the plate width decreases provided the wide-slot to plate-width ratio is fixed. Using an asymmetric plate driver, a stronger vortex is generated for the same actuator geometry and a given driver repetition rate. The nondimensional scaling provides the approximate ranges for operating the actuator in the free jet, wall jet, or vortex flow regimes. Finally, phase-locked velocity measurements from particle image velocimetry indicate that the vortex structure is stationary, confirming previous computations. Both the computations and the particle image velocimetry measurements (expectantly) show unsteadiness near the wide-slot opening, which is indicative of mass ejection from the actuator.

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Section: Resultsmentioning

confidence: 99%

“…The experimental configuration of the JaVA is discussed in detail by Lachowicz et al (1999). All previously published results for the JaVA used a sine wave to drive the actuator plate.…”

Section: Approach Flow Control Actuatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physical Analysis and Scaling of a Jet and Vortex Actuator

Jason

Yao

Ronald

2001

Journal of Aircraft

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show abstract

“…These findings led to the basic idea that artificial interference on the evolution process of vortices enhances or attenuates the essential flow characteristics. Such interference or control, as noted by Fiedler and Fernholz [6], can be classified into either active control [7][8][9][10][11][12] or passive control [13,14]. Apart from the classical circular nozzle [15], utilization of non-circular nozzle [16][17][18][19][20] such as rectangular nozzle is one of the simplest and most efficient ways of passive control.…”

Section: Introductionmentioning

confidence: 97%