Flow Control to the Surface on Airfoil with Plasma Synthetic Jet Actuator

加久治, 小河原; 直樹, 中谷; 壮一, 佐伯

doi:10.1299/kikaib.69.2237

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…In experimental investigation of this PSJA, NACA0012 airfoil had effect of drag reduction up to 29% 10 . In numerical study, the optimum position of electrode and the combination of PSJA was studied [11][12][13] .…”

Section: Introductionmentioning

confidence: 89%

Direct Measurement of Wall-Shear Stress of Plane Shear Layer with Plasma Synthetic Jet Actuator

Higuchi

Ogawara

Mochizuki

2009

JFST

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One of the useful ways to measure the effect of the flow control devise is to use the wall-shear stress sensor to measure the wall-shear stress directly. The sensor used in this paper measures the wall-shear stress, which is reduced by the flow control devise. In this paper, the wall-shear stress of the plane shear layer with the plasma synthetic jet actuator (PSJA) is investigated. PSJA is a flow control device composed of electrodes with A.C. signal. The actuator uses electrohydrodynamic (EHD) effect and induces flow around the electrodes. PSJA has great advantage such as miniaturization, maintenance free, and easy to control compared to other actuators. In this paper, the wall-shear stress of plane shear layer in a low-speed turbulent wind tunnel is observed to measure the effect of the PSJA. The results show that the PSJA changes the flow condition of shear layer by accelerating the flow in shear layer. The wall-shear stress reduces and increases according to the displacement of the wall-shear stress sensor and the actuator.

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Section: Introductionmentioning

confidence: 89%

Direct Measurement of Wall-Shear Stress of Plane Shear Layer with Plasma Synthetic Jet Actuator

Higuchi

Ogawara

Mochizuki

2009

JFST

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“…While, PSJA is light and is easily miniaturized because PSJA does not have moving parts. The experiment that PSJA installed on NACA0012 wing showed PSJA effect approximately 29% (5)(6) (7) in drag reduction effect.…”

Section: Introductionmentioning

confidence: 95%

Extremum Seeking Adaptive Separation Control on a Wing with Plasma Synthetic Jet Actuator

Ogawara

Kojima

Matsumoto

et al. 2012

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Plasma synthetic jet actuator (PSJA) is a flow control device which has structure that insulator is tucked with electrode pair. It generates electrohydrodynamic (EHD) effect and induces a flow. The experiment was held to investigate the effect of flow control using extremum seeking with PSJA placed on the surface of NACA0012 wing installed in the wind tunnel. Frequency of the input signal to PSJA is modulated to maximize the effect of PSJA in flow control. The wake velocity fluctuation is one of indexes on separation control effect. The wake velocity is minimized over the input frequency by employing extremum seeking. The seeking algorithm calculates the correlation of the modulation frequency and wake velocity fluctuation. The modulation signal frequency where the correlation changes from negative to positive minimizes the wake velocity fluctuation. To detect a local minimum of the wake velocity fluctuation by extremum seeking, it is necessary to change the modulation signal frequency with time. Sine and square waves change the modulation signal frequency to PSJA. The wind tunnel speed was changed as an external factor. The experimental results show that the modulation signal frequency can track the optimum value when the wind tunnel speed is changed. This paper shows that adaptive flow control to optimize the modulation signal frequency with PSJA using extremum seeking enables to suppress turbulence on the flow field of wings.

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“…In contrast, synthetic jets are lightweight and can be more easily downsized because they comprise relatively simple parts, such as piezoelectric actuators (Amitay, et al, 2001;Holman, et al, 2005;Smith and Glezer, 1998), speaker-driven actuators (Huang, 1996;Nishibe, et al, 2011 ), pistons (Whitehead and Gursul, 2006), or diaphragms (James, et al, 1996). Synthetic jet actuators using the plasma method have been proposed for boundary layer control for airfoils in recent years (Ogawara, et al, 2003(Ogawara, et al, , 2005. However, these actuators are still in the research stage; some aspects are not yet fully understood, including the conditions for jet flow production and the relation between the flow characteristics and the drive system of the actuators.…”

Section: Introductionmentioning

confidence: 99%

Synthetic jet actuator using bubbles produced by electric discharge

Nishibe

Fujiwara

Ohue

et al. 2014

JFST

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Over the last decade, synthetic jets suitable for micro-machinery have received attention for their potential to replace continuous jets. The development of synthetic jet actuators with, for example, a diaphragm, a piston, a piezoelectric element, or a speaker cone instead of mechanical drivers, is required for the downsizing and weight reduction of flow control systems in fluid machines. In this study, an experimental prototype for a synthetic jet actuator that uses the nonlinear oscillation of bubbles produced by repetitive electric discharge is proposed. Numerical simulations are performed to clarify the fundamental flow behavior of the synthetic jets produced by bubble motion. The behavior of a bubble induced by a single discharge and the estimated change in nozzle exit velocity with time are shown, and typical flow patterns for synthetic jets produced by periodic electric discharge are discussed. The influence of the ratio of the bubble driving cycle period to the electric discharge cycle period (T*) on the unsteady flow pattern and the time-averaged jet structure is investigated in detail. In addition, the flow characteristics of a synthetic jet with downtime are compared with those of a normal synthetic jet produced by linear oscillation under the condition that the strokes of both jets are equivalent. simple, (2) a high actuator density can be achieved, and (3) high jet velocities can be achieved. In this study, an electric discharge is used to induce cavitation bubbles. (4) A variety of bubble generation methods have been proposed by many researchers (Kato, 1999). For example, it is expected that well-established techniques used in thermal (bubble-driven) inkjet printers can be adapted to synthetic micro-jets. The continuous generation of bubbles produced by cyclic suction and ejection is essential to synthetic jets. The continuous generation of bubbles produced by cyclic suction and ejection is essential to synthetic jets. In this work, metal or semiconductor particles are mixed into the liquid to improve the efficiency of the periodic breakdown and an attempt is made to meliorate the bubble generation probability of the actuator by applying a servo-drive mechanism to the electrodes. The temporal behavior of the velocity at the outlet of the slot is calculated from the volume fluctuation of the bubbles, and the behavior of the generated jet flow is observed with a highspeed camera. Since the continuous formation of a new bubble through electric discharge is difficult in a synthetic jet actuator, velocity fluctuations at the outlet of the slot are not sinusoidal, in contrast to conventional synthetic jets using a speaker or piezoelectric device. In addition, the flow velocity at the outlet of the slot during the downtime is approximately zero.An experimental prototype of a micro-synthetic jet that uses bubbles produced by electric discharge is investigated. Numerical simulations are also performed by modeling the flow velocity at the outlet of the actuator with bubbles produced by electric disc...

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Flow Control to the Surface on Airfoil with Plasma Synthetic Jet Actuator

Cited by 6 publications

References 2 publications

Direct Measurement of Wall-Shear Stress of Plane Shear Layer with Plasma Synthetic Jet Actuator

Direct Measurement of Wall-Shear Stress of Plane Shear Layer with Plasma Synthetic Jet Actuator

Extremum Seeking Adaptive Separation Control on a Wing with Plasma Synthetic Jet Actuator

Synthetic jet actuator using bubbles produced by electric discharge

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