An Experimental and Numerical Investigation on Fluidic Oscillators For Flow Control

Cerretelli, Ciro; Gharaibah, Emad

doi:10.2514/6.2007-3854

Cited by 13 publications

(8 citation statements)

References 8 publications

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“…Slupski et al 21 indicated that the oscillation frequency varied linearly with inlet velocity. Cerretelli and Gharaibah 22 researched flow mechanisms inside the fluidic oscillator to optimize the performances by analyzing the oscillation frequency. On the basis of the lumped modeling theory for fluidic components, they could be able to predict the oscillation frequencies for the fluidic oscillators.…”

Section: Introductionmentioning

confidence: 99%

Studies on the Drive Mechanism of the Main Jet Deflection Inside a Fluidic Oscillator

Hao

Liu

Wang

et al. 2020

Ind. Eng. Chem. Res.

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In order to improve the understanding of the drive mechanism of the main jet deflection inside a fluidic oscillator, a 3D large eddy simulation and a visualization experiment are performed. The distribution of vortex cores, pressures, and mass flow rates through certain planes are discussed emphatically to explore the process of oscillation. The pressure difference inside the fluidic oscillator and the mass flow rate for some certain planes are compared. A kind of sine wave with certain phase differences is found for these two flow parameters. The results show that the vortex cores distributed between the wall of the chamber and the main jet and the pressure differences between the left and right sides would drive the deflection of the main jet. In addition, the max pressure difference is found to be located in the inlet of the feedback channels, which would also help to promote the process of deflection.

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Section: Introductionmentioning

confidence: 99%

Studies on the Drive Mechanism of the Main Jet Deflection Inside a Fluidic Oscillator

Hao

Liu

Wang

et al. 2020

Ind. Eng. Chem. Res.

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“…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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“…Note that an investigation on the physical mechanism and the scaling laws for fluidic oscillators was performed in [43]. However, in that study the feedback loop was designed in a different way, thus making the results inapplicable to the FO-PJAs used here.…”

Section: Experimental Methodologymentioning

confidence: 99%

Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

Löffler

Ebert

Weiss

2021

Fluids

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The control of flow separation on aerodynamic surfaces remains a fundamental goal for future air transportation. On airplane wings and control surfaces, the effects of flow separation include decreased lift, increased drag, and enhanced flow unsteadiness and noise, all of which are detrimental to flight performance, fuel consumption, and environmental emissions. Many types of actuators have been designed in the past to counter the negative effects of flow separation, from passive vortex generators to active methods like synthetic jets, plasma actuators, or sweeping jets. At the Chair of Aerodynamics at TU Berlin, significant success has been achieved through the use of pulsed jet actuators (PJA) which operate by ejecting a given amount of fluid at a specified frequency through a slit-shape slot on the test surface, thereby increasing entrainment and momentum in a separating boundary layer and thus delaying flow separation. Earlier PJAs were implemented using fast-switching solenoid valves to regulate the jet amplitude and frequency. In recent years, the mechanical valves have been replaced by fluidic oscillators (FO) in an attempt to generate the desired control authority without any moving parts, thus paving the way for future industrial applications.

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An Experimental and Numerical Investigation on Fluidic Oscillators For Flow Control

Cited by 13 publications

References 8 publications

Studies on the Drive Mechanism of the Main Jet Deflection Inside a Fluidic Oscillator

Studies on the Drive Mechanism of the Main Jet Deflection Inside a Fluidic Oscillator

Parameters Governing Separation Control with Sweeping Jet Actuators

Fluidic-Oscillator-Based Pulsed Jet Actuators for Flow Separation Control

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