Numerical Studies of an Array of Fluidic Diverter Actuators for Flow Control

Gökoğlu, Süleyman A.; Kuczmarski, Maria A.; Culley, Dennis E.; Raghu, S.

doi:10.2514/6.2011-3100

Cited by 17 publications

(10 citation statements)

References 11 publications

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“…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. The fluidic actuators investigated in these studies vary by type, geometry, working fluid, etc.…”

Section: Motivation and Objectivesmentioning

confidence: 99%

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%

Numerical Study of Internal Flow Structures in a Sweeping Jet Actuator

Kara

2015

33rd AIAA Applied Aerodynamics Conference

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“…The fluidic actuators under consideration here are closely related to the ones examined by Gokoglu et al [8][9][10] The primary difference in the current configuration is the absence of the divider section used in their work to create twin outlets for the fluid to exit. In the current configuration, which is simpler to fabricate and is being used in several practical applications, the jet comes out of a single outlet, as sketched in Fig.…”

Section: Configurationsmentioning

confidence: 99%

“…Flow characteristics of similar actuators have been examined by Gokoglu et al in a series of papers. [8][9][10] These will be referred to as Type I, 124D and 90D actuators, or for simplicity as 124D and 90D actuators.…”

Section: Configurationsmentioning

confidence: 99%

Numerical Simulation of Fluidic Actuators for Flow Control Applications

Vatsa

Köklü

Wygnanski

et al. 2012

6th AIAA Flow Control Conference

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Active flow control technology is finding increasing use in aerospace applications to control flow separation and improve aerodynamic performance. In this paper we examine the characteristics of a class of fluidic actuators that are being considered for active flow control applications for a variety of practical problems. Based on recent experimental work, such actuators have been found to be more efficient for controlling flow separation in terms of mass flow requirements compared to constant blowing and suction or even synthetic jet actuators. The fluidic actuators produce spanwise oscillating jets, and therefore are also known as sweeping jets. The frequency and spanwise sweeping extent depend on the geometric parameters and mass flow rate entering the actuators through the inlet section. The flow physics associated with these actuators is quite complex and not fully understood at this time. The unsteady flow generated by such actuators is simulated using the lattice Boltzmann based solver PowerFLOW R . Computed mean and standard deviation of velocity profiles generated by a family of fluidic actuators in quiescent air are compared with experimental data. Simulated results replicate the experimentally observed trends with parametric variation of geometry and inflow conditions. Nomenclature

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“…This is supported by spectral analysis of instantaneous force measurements which do not indicate any dominant frequency. Although numerically an array of actuators can produce jets sweeping in phase [52] , any disturbance in the start-up process of the sweeping motion or in the actuators' geometry yields jets sweeping out of phase without recovery.…”

Section: Characterization Of Actuators 41mentioning

confidence: 99%

“…The characteristics of various actuator types, conceptually similar to the designs shown in Figure 1, have been investigated experimentally [31][32][33][41][42][43][44][45][46][47][48] and numerically [48][49][50][51][52] by numerous researchers. Several active and passive concepts to provide the oscillatory character of the emitted jet have been proposed, including selfinduced feedback [43] and external control [42,[44][45][46][47] designs.…”

Section: Introductionmentioning

confidence: 99%

Parameters Governing Separation Control with Sweeping Jet Actuators

Woszidlo

2011

29th AIAA Applied Aerodynamics Conference

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Numerical Studies of an Array of Fluidic Diverter Actuators for Flow Control

Cited by 17 publications

References 11 publications

Numerical Study of Internal Flow Structures in a Sweeping Jet Actuator

Numerical Study of Internal Flow Structures in a Sweeping Jet Actuator

Numerical Simulation of Fluidic Actuators for Flow Control Applications

Parameters Governing Separation Control with Sweeping Jet Actuators

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