Active flow separation control at the outer wing

Rosenblum, J. P.; Vrchota, Petr; Prachař, Aleš; Peng, Shia-Hui; Wallin, Stefan; Eliasson, Peter; Iannelli, Pierluigi; Ciobaca, Vlad; Wild, Jochen; Hantrais-Gervois, Jean-Luc; Costes, M.

doi:10.1007/s13272-019-00402-4

Cited by 8 publications

(7 citation statements)

References 9 publications

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“…The SJs are particularly useful in the LED cooling systems such as SynJet ® [3] or the configuration investigated in [4]. SJ is also used in flow control [5,6], mixing [7,8] and other fields.…”

Section: Introductionmentioning

confidence: 99%

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

et al. 2020

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The acoustic and flow aspects of the novel synthetic jet actuator (SJA) with fins inside the cavity were experimentally investigated for three types of enclosure design and two models of loudspeaker. The aim of the study is to find the parameter which connects the flow and acoustic properties of the SJA and allows us to choose the optimal solution in those regards. The hot wire anemometry was used for the velocity measurements and the sound pressure level was measured with a sound level meter. The model of the loudspeaker turned out to have a significantly stronger impact on the flow parameters and noise level than the shape of the fins in the cavity. The parameter that showed a dependence on the shape of the fins was the actuator’s efficiency. A ratio of the root-mean-square velocity at the orifice axis to the sound pressure level (U0.c/SPL) was used to connect the acoustic and flow properties of the tested actuators. This parameter was subsequently applied to determine the best configuration among the tested actuators.

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Section: Introductionmentioning

confidence: 99%

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

et al. 2020

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“…road vehicles, [17][18] wings. [19][20] However, the application of these flow control techniques for internal flow fields are found in scanty. Passive devices, namely, deflectors, 21 vane-type vortex generators, [22][23][24][25] and active devices like vortex generator jets 13,26 are used in air-intake applications.…”

Section: Introductionmentioning

confidence: 99%

Flow characteristics and separation control in a transitional twin air-intake

Yadav

Jain

Paul

2022

Proceedings of the Institution of Mechanical Engineers, Part G:

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Ambient air is ingested into the engine of military aircrafts using the air-intake system within a limited space. The flow non-uniformity produced in the air-intake creates flow separation and total pressure loss due to the centerline curvature and area diffusion which eventually affects its performance. The current work discusses the performance of a transitional twin air-intake without and in presence of slotted synthetic jets. The synthetic jet is employed just before the inflection at a range of velocity ratio from 1 to 10 and found that for a velocity ratio of 4.0, the pressure distortion at the aerodynamic interface plane is found minimum. Hence, the other performance parameters are computed at that optimized flow condition. The outcome of the study reveal that the static pressure is recovered by 4.61%–6.64% while the total pressure loss is decreased by 59.28%–89.95% using optimized synthetic jets for a range of Reynolds numbers.

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“…Flow separation that occurs on an aircraft wing negatively affects aerodynamic performance. Therefore, many studies on the control of flow separation have been conducted [1][2][3][4][5]. Flow control technologies are classified into passive flow control (PFC) [1], which attaches various structures to the surface, and active flow control (AFC) [2], which uses actuators such as plasma actuators [3], backward traveling waves [4], and periodic surface morphing [5].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, many studies on the control of flow separation have been conducted [1][2][3][4][5]. Flow control technologies are classified into passive flow control (PFC) [1], which attaches various structures to the surface, and active flow control (AFC) [2], which uses actuators such as plasma actuators [3], backward traveling waves [4], and periodic surface morphing [5]. AFC has an advantage of removing the drag-increase problem, which is a disadvantage of PFC, and enables effective separation control [6].…”

Section: Introductionmentioning

confidence: 99%

Effects of Bending of Fluidic Oscillators on Aerodynamic Performance of an Airfoil with a Flap

Kim¹,

Kim²

2021

Processes

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The present work investigated the effects of bending the outlet nozzles of fluidic oscillators installed on the NACA0015 airfoil with a flap on the flow control performance and, thus, the aerodynamic performance of the airfoil. The effects of bending on fluidic oscillators have not been reported so far in previous works. The aerodynamic analysis was performed numerically using unsteady Reynolds-averaged Navier-Stokes equations. Three different cases were considered: Case 1 changes only the bending angle with a fixed pitch angle, Case 2 changes only the pitch angle without bending, and Case 3 changes both the bending and pitch angles. Although the bending of the oscillators was introduced inevitably due to a geometrical limitation in the installation, the results indicated that the bending rather improved the lift coefficient and lift-to-drag ratio of the airfoil by improving the characteristics of the fluidic oscillators, such as the jetting angle and peak velocity ratio.

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Active flow separation control at the outer wing

Cited by 8 publications

References 9 publications

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Acoustic and Flow Aspects of Novel Synthetic Jet Actuator

Flow characteristics and separation control in a transitional twin air-intake

Effects of Bending of Fluidic Oscillators on Aerodynamic Performance of an Airfoil with a Flap

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