Analysis of flow distribution from high-speed flow actuator using particle image velocimetry and digital speckle tomography

Ko, Han Seo; Haack, Sarah; Land, H. Bruce; Cybyk, Bohdan; Katz, Joseph; Kim, H. J.

doi:10.1016/j.flowmeasinst.2010.06.001

Cited by 47 publications

(23 citation statements)

References 23 publications

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“…The very fast issuing jet (O(µs)), small cavity scales (O(mm)) and strong electromagnetic interference due to the repetitive high voltage pulses render the characterization of PSJA challenging [7][8]. Until this point, experimental data related to the expelled gas mass per discharge cycle, impulse per jet pulse, and especially the electro-mechanical efficiency are largely not available.…”

mentioning

confidence: 99%

Electro-mechanical efficiency of plasma synthetic jet actuator driven by capacitive discharge

Zong¹,

Kotsonis²

2016

J. Phys. D: Appl. Phys.

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mentioning

confidence: 99%

Electro-mechanical efficiency of plasma synthetic jet actuator driven by capacitive discharge

Zong¹,

Kotsonis²

2016

J. Phys. D: Appl. Phys.

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“…In recent years, various studies have been conducted on electrostatic and electromagnetic actuators. Actuators making use of piezoelectric materials [1][2][3] or plasma [4][5][6][7][8][9][10][11][12][13][14][15] are also being developed. There are several possible configurations for piezoelectric actuators, including: a synthetic jet [1][2] and a flat plat actuator [3].…”

mentioning

confidence: 99%

“…A new plasma actuator referred to as the "sparkjet" has been proposed by the Johns Hopkins University Applied Physics Laboratory [11,12]. This actuator is able to produce high-speed jet velocities, with a peak velocity measured by the PIV technique in excess of 50 m/s [13]. A pulsed plasma jet inspired by the sparkjet actuator is presented in [14], with a jet velocity of the order of 300 m/s.…”

mentioning

confidence: 99%

Influence of the energy dissipation rate in the discharge of a plasma synthetic jet actuator

Belinger

Hardy

Barricau

et al. 2011

J. Phys. D: Appl. Phys.

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Abstract.A promising actuator for high-speed flow control, referred to as a Plasma Synthetic Jet (P.S.J), is being studied by the DMAE department of the ONERA, and the Laplace laboratory of the CNRS, in France. This actuator was inspired by the "Sparkjet" device developed by the Johns Hopkins University Applied Physics Laboratory. The PSJ, which produces a synthetic jet with high exhaust velocities, no active mechanical components and no mass flow admission, holds the promise of enabling high-speed flows to be manipulated. With this high velocity jet it is possible to reduce fluid phenomena such as transition and turbulence, thus making it possible to increase an aircraft's performance whilst at the same time reducing its environmental impact. A thermal plasma discharge was created in a micro cavity, causing the gas to be expelled. It is relevant that the velocity and momentum depend on the energy dispersed by the electric discharge. To control the frequency and energy dispersed in the plasma, the Laplace laboratory has developed two high voltage power supply systems. These allow two different types of discharge to be produced, with energy being supplied to the discharge in two different manners. In this paper, we focus on the impact of the power supply on the Plasma Synthetic Jet, and in particular on the role of the rate of energy dissipation in the discharge. In order to estimate the influence of the power supply on the machinery of the actuator, specific experimental techniques were used to investigate the electrical (voltage, current), thermal (Infra-red camera) and aerodynamic (jet duration, isentropic pressure, jet velocity) characteristics. These data sets were used to determine which of the two power supplies was more effective, thus allowing us to reach several conclusions concerning the importance of the energy dissipation rate on the PSJ actuator.1.

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“…The primary system provides seeding by a SAFEX fog generator located in the setting chamber of the wind tunnel, using a working fluid of water-glycol mixture, producing particles of approximately 1 µm mean diameter. A separate, secondary seeding scheme proposed by Zong & Kotsonis (2016a) is inherited, to overcome the problem of low seeding density in the jet core (Ko et al 2010). Through the secondary system, the actuator cavity is seeded with dielectric mineral oil particles (Shell Ondina) of 1.5 µm mean diameter, generated by an atomizer (TSI 9302).…”

Section: Hotwire Anemometer and Particle Image Velocimetrymentioning

confidence: 99%

Interaction between plasma synthetic jet and subsonic turbulent boundary layer

Zong

Kotsonis

2017

Physics of Fluids

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This paper experimentally investigates the interaction between a plasma synthetic jet (PSJ) and a subsonic turbulent boundary layer (TBL) using a hotwire anemometer and phase-locked particle imaging velocimetry. The PSJ is interacting with a fully developed turbulent boundary layer developing on the flat wall of a square wind tunnel section of 1.7 m length. The Reynolds number based on the freestream velocity (U∞ = 20 m/s) and the boundary layer thickness (δ99 = 34.5 mm) at the location of interaction is 44 400. A large-volume (1696 mm3) three-electrode plasma synthetic jet actuator (PSJA) with a round exit orifice (D = 2 mm) is adopted to produce high-speed (92 m/s) and short-duration (Tjet = 1 ms) pulsed jets. The exit velocity variation of the adopted PSJA in a crossflow is shown to remain almost identical to that in quiescent conditions. However, the flow structures emanating from the interaction between the PSJ and the TBL are significantly different from what were observed in quiescent conditions. In the midspan xy plane (z = 0 mm), the erupted jet body initially follows a wall-normal trajectory accompanied by the formation of a distinctive front vortex ring. After three convective time scales the jet bends to the crossflow, thus limiting the peak penetration depth to approximately 0.58δ99. Comparison of the normalized jet trajectories indicates that the penetration ability of the PSJ is less than steady jets with the same momentum flow velocity. Prior to the jet diminishing, a recirculation region is observed in the leeward side of the jet body, experiencing first an expansion and then a contraction in the area. In the cross-stream yz plane, the signature structure of jets in a crossflow, the counter-rotating vortex pair (CVP), transports high-momentum flow from the outer layer to the near-wall region, leading to a fuller velocity profile and a drop in the boundary layer shape factor (1.3 to 1.2). In contrast to steady jets, the CVP produced by the PSJ exhibits a prominent spatiotemporal behaviour. The residence time of the CVP is estimated as the jet duration time, while the maximum extent of the affected flow in the three coordinate directions (x, y, and z) is approximately 32D, 8.5D, and 10D, respectively. An extremely high level of turbulent kinetic energy production is shown in the jet shear-layer, front vortex ring, and CVP, of which the contribution of the streamwise Reynolds normal stress is dominant. Finally, a conceptual model of the interaction between the PSJ and the TBL is proposed.

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Analysis of flow distribution from high-speed flow actuator using particle image velocimetry and digital speckle tomography

Cited by 47 publications

References 23 publications

Electro-mechanical efficiency of plasma synthetic jet actuator driven by capacitive discharge

Electro-mechanical efficiency of plasma synthetic jet actuator driven by capacitive discharge

Influence of the energy dissipation rate in the discharge of a plasma synthetic jet actuator

Interaction between plasma synthetic jet and subsonic turbulent boundary layer

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