Flow Separation Control Over a Ramp Using Sweeping Jet Actuators

Köklü, Mehti; Owens, Lewis R.

doi:10.2514/6.2014-2367

Cited by 26 publications

(35 citation statements)

References 29 publications

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“…The external flow field properties of a fluidic oscillator were investigated before [10][11][12][13][14][15][16][17][18][19][20] . However, the internal flow field of such devices has only been examined by two experimental 4, 5 and four numerical [21][22][23][24] studies.…”

Section: Motivation and Objectivesmentioning

confidence: 99%

“…Recently, an increasing number of studies were published, especially in flow separation control. Significant aerodynamic performance improvements were achieved using new concepts 8,9 or sweeping jets [10][11][12][13][14][15][16][17][18][19] . The sweeping jet actuator has been proven to be an effective and efficient tool for separation control.…”

Section: Introductionmentioning

confidence: 98%

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Numerical Study of Internal Flow Structures in a Sweeping Jet Actuator

Kara

2015

33rd AIAA Applied Aerodynamics Conference

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This study focuses on the generation and interaction of internal flow structures, jet oscillation process, and pressure drop mechanism of a Sweeping Jet Actuator. Timedependent numerical analysis was performed over a range of inlet mass flow rates. The effect of varying inlet mass flow rate on the sweeping jet oscillation frequency was calculated and a strong agreement was found with the experimental measurements. The velocity, temperature and pressure fields are provided. The complex flow field inside the Sweeping Jet Actuator for half an oscillation cycle are presented by velocity magnitude and total pressure contours. Formation of vortices from sharp corners in the actuator core surfaces were observed, and their role in jet oscillation is shown.

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Section: Motivation and Objectivesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Numerical Study of Internal Flow Structures in a Sweeping Jet Actuator

Kara

2015

33rd AIAA Applied Aerodynamics Conference

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“…A description of the tunnel was reported in Refs. [4,13]. The tunnel is a closed-return, atmospheric facility used primarily for fundamental flow-physics research.…”

Section: A Facility and Instrumentationmentioning

confidence: 99%

“…A previously developed flow visualization technique was used in this study [13]. The surface oilflow visualization was obtained using a mixture of aviation oil, kerosene oil, and nanosized silica particles.…”

Section: A Facility and Instrumentationmentioning

confidence: 99%

“…They reported that SWJ actuators produce wider jet-spreading and higher velocity fluctuations compared to the turbulent free jets and act as vortex-generating jets in failure modes [12]. SWJ actuators successfully controlled flow separation on an adverse pressure gradient (APG) ramp [13]. It was revealed that the SWJ actuators are more efficient than steady blowing using straight and angled jets (VGJs).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Sweeping Jet Actuator Parameters on Flow Separation Control

Köklü

2018

AIAA Journal

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A parametric experimental study was performed with sweeping jet actuators (fluidic oscillators) to determine their effectiveness in controlling flow separation on an adverse pressure gradient ramp. Actuator parameters that were investigated include blowing coefficients, operation mode, pitch and spreading angles, streamwise location, and size. Surface pressure measurements and surface oilflow visualization were used to characterize the effects of these parameters on the actuator performance. 2D Particle Image Velocimetry measurements of the flow field over the ramp and hot-wire measurements of the actuator's jet flow were also obtained for selective cases. In addition, the sweeping jet actuators were compared to other well-known flow control techniques such as micro-vortex generators, steady blowing, and steady vortex-generating jets. The results confirm that the sweeping jet actuators are more effective than steady blowing and steady vortexgenerating jets for this ramp configuration. The results also suggest that an actuator with a wider jet spreading (110 vs. 70 degrees) placed closer (2.3 vs. 7 boundary layer thickness upstream) to the flow separation location provides better performance. Different actuator sizes obtained by scaling down the actuator geometry produced different jet spreading. Scaling down the actuator (based on the throat dimensions) from 6.35 × 3.18 mm to 3.81 × 1.9 mm resulted in similar flow control performance; however, scaling down the actuator further to 1.9 × 0.95 mm reduced the actuator efficiency by reducing the jet spreading considerably. The results of this study provide insight that can be used to design and select the optimal sweeping jet actuator configuration for flow control applications. 1 Aerospace Engineer, Flow Physics and Control Branch, MS 170, Member AIAA.

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Flow control using fluidic oscillators on an airfoil with a flap

Kim

2021

Engineering Applications of Computational Fluid Mechanics

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Flow Separation Control Over a Ramp Using Sweeping Jet Actuators

Cited by 26 publications

References 29 publications

Numerical Study of Internal Flow Structures in a Sweeping Jet Actuator

Numerical Study of Internal Flow Structures in a Sweeping Jet Actuator

Effects of Sweeping Jet Actuator Parameters on Flow Separation Control

Flow control using fluidic oscillators on an airfoil with a flap

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