Effect of Synthetic Jets Spacing on Flow Separation over Swept, Flapped Airfoils

Monastero, Marianne C.; Lindstrom, Annika; Amitay, Michael

doi:10.2514/1.j058304

Cited by 6 publications

(4 citation statements)

References 30 publications

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“…SJAs contain a piezoelectric diaphragm that alternates the air volume in the cavity and produces the synthetic jet through an orifice [7,8]. SJAs are generally smaller than an aircraft wingspan, so they are usually used in array form to cover long spans in aeronautical applications [9,10]. There have been several studies in the literature that first focused on the design of a singular SJA unit and then utilized these units in arrays for a magnified effect.…”

Section: Introductionmentioning

confidence: 99%

“…SJAs may comprise a number of discrete cavities excited by isolated piezoelectric elements [11,12] or a large, unifiedcavity volume excited simultaneously by several piezoelectric elements. In the latter case, the single, large cavity may have several orifices [10] or a large-aspect-ratio rectangular slot [13,14]. Tang et al [12] characterized a single cube-shaped cavity-volume unit powered by four piezoelectric elements and used ten of these SJA units, keeping them isolated, in an array form along an aerofoil span.…”

Section: Introductionmentioning

confidence: 99%

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Jet Velocity and Acoustic Excitation Characteristics of a Synthetic Jet Actuator

Arafa

Sullivan

Ekmekci

2022

Fluids

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The effect of the excitation frequency of synthetic jet actuators on the mean jet velocity issuing from an array of circular orifices is investigated experimentally, focusing on the acoustic excitation characteristics of the actuator’s cavity. Two cavity configurations are considered. In the first configuration, synthetic jets are generated by exciting a single, large cavity having an array of sixteen orifices via sixteen piezoelectric elements. In the second configuration, the cavity volume of the first configuration is divided into eight isolated compartments, each with two orifices and two piezoelectric elements. Several distinct resonant peaks were observed in the frequency response of the synthetic jet actuator built with a single large-aspect-ratio cavity, whereas the case of compartmentalised cavities exhibited a single resonant peak. Acoustic simulations of the large-aspect-ratio-cavity volume showed that the multiple peaks in its frequency response correspond to the acoustic standing-wave mode shapes of the cavity. Due to its large aspect ratio, several acoustic mode shapes coexist in the excitation frequency range aside from the Helmholtz resonance frequency. When the actuator’s cavity volume is compartmentalised, only the Helmholtz resonance frequency is observed within the excitation frequency range.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Jet Velocity and Acoustic Excitation Characteristics of a Synthetic Jet Actuator

Arafa

Sullivan

Ekmekci

2022

Fluids

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“…Blowing air simultaneously at the leading and trailing edges can increase circulation to achieve the effect of increasing lift, but the air source from the engine will cause thrust loss. While synthetic jet 5,6 performs active flow control with zero mass flow, it cannot induce high-speed jets and has low environmental adaptability. Therefore, most of the current active flow control methods have their advantages, but the limitation is that it is poorly applicable.…”

Section: Introductionmentioning

confidence: 99%

Aerodynamic shape optimization of co-flow jet airfoil using a multi-island genetic algorithm

Jiang

Yao

2022

Physics of Fluids

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The co-flow jet is a Zero-Net-Mass-Flux (ZNMF) active flow control strategy and presents great potential to improve the aerodynamic efficiency of future fuel-efficient aircraft. The present work is to integrate the co-flow jet technology into aerodynamic shape optimization to further realize the potential of co-flow-jet technology and improve co-flow jet airfoil performance. The optimization results show that the maximum energy efficiency ratio of lift-augmentation and drag-reduction increased by 203.53% (α=0◦) and 10.25% (α=10◦) at the Power-1 condition (power coefficient of 0.3), respectively. A larger curvature is observed near the leading edge of the optimized aerodynamic shape, which leads to the early onset of flow separation and improves energy transfer efficiency from the jet to the free stream. In addition, the higher mid-span of the optimized airfoil is characterized by accelerating the flow in the middle of the airfoil, increasing the strength of the negative pressure zone, thus improving the stall margin and enhancing the co-flow jet circulation.

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“…The flow separation control techniques have been considered as a significant field of fluid mechanics [7][8][9][10]. The flow separation control can be achieved employing active methods for example; blowing and suction jets [11][12][13][14], and synthetic jet actuators [15][16][17], or passive methods such as flap, slat, vortex generator, and Gurney flap [18][19][20][21]. Flow simulation around the airfoil up to pre-stall and stall range continues to be a challenging problem and requires experimental results to determine the actual behavior of the flow.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous Effect of Suction and Cavity for Controlling Flow Separation on NACA 0012 Airfoil – CFD Approach

Fatahian

2021

Gazi University Journal of Science

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Effect of Synthetic Jets Spacing on Flow Separation over Swept, Flapped Airfoils

Cited by 6 publications

References 30 publications

Jet Velocity and Acoustic Excitation Characteristics of a Synthetic Jet Actuator

Jet Velocity and Acoustic Excitation Characteristics of a Synthetic Jet Actuator

Aerodynamic shape optimization of co-flow jet airfoil using a multi-island genetic algorithm

Simultaneous Effect of Suction and Cavity for Controlling Flow Separation on NACA 0012 Airfoil – CFD Approach

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