Straight and curved type micro dielectric barrier discharge plasma actuators for active flow control

Aono, Hikaru; Yamakawa, Shota; Iwamura, Koh; Honami, Shinji; Ishikawa, Hitoshi

doi:10.1016/j.expthermflusci.2017.05.005

Cited by 20 publications

(8 citation statements)

References 26 publications

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“…With regards to the influence of actuation symmetry and arrangement [210], up to 67% augmentation in lift coefficient and 63% drag-coefficient reduction were observed with symmetrical actuation, thus delivering better flow control, while streamwise actuation was stressed to be superior to spanwise actuation. These results were backed by a comparative study between micro straight and curved-type plasma actuators [211], in which the superior flow controllability of curved-actuator was attributed to the formation of streamwise vortices. As demonstrated in [212], plasma-actuation-aided circulation control successfully augments the lift coefficient by 0.1 [212], where flow controllability was observed to subside over stall-approach and increment in stream velocity.…”

Section: Plasma Actuatorsmentioning

confidence: 94%

“…Plasma actuators were initially developed by Velkoff and Ketchman [199] in the late 1960s, while their application as flow-control devices was first investigated in the 1990s [200][201][202]. Over the years, numerous investigations concerning flow-separation control and aerodynamic enhancement using plasma actuation surfaced [203][204][205][206][207][208][209][210][211][212][213][214][215][216][217][218]. The actuation was reportedly comparable to a minor camber-increment effect, which exhibits increments in aerodynamic forces [203], whereas an aerodynamic analysis of which demonstrated glide-ratio enhancement of 400% and stall delay of 8 • [204][205][206].…”

Section: Plasma Actuatorsmentioning

confidence: 99%

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Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Akhter

Omar

2021

Energies

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It is projected that, in the following years, the wind‐energy industry will maintain its rapid growth over the last few decades. Such growth in the industry has been accompanied by the desirability and demand for larger wind turbines aimed at harnessing more power. However, the fact that massive turbine blades inherently experience increased fatigue and ultimate loads is no secret, which compromise their structural lifecycle. Accordingly, this demands higher overhaul‐and‐maintenance (O&M) costs, leading to higher cost of energy (COE). Introduction of flow‐control devices on the wind turbine is a plausible solution to this issue. Flow‐control mechanisms feature the ability to effectively enhance/suppress turbulence, advance/delay flow transition, and prevent/promote separation, leading to enhancement in aerodynamic and aeroacoustics performance, load alleviation and fluctuation suppression, and eventually wind turbine power augmentation. These flow‐control devices are operated primarily under two schemes: passive and active control. Development and optimization of flow‐control devices present the potential for reduction in the COE, which is a major challenge against traditional power sources. This review performs a comprehensive and up‐to‐date literature survey of selected flow‐control devices, from their time of development up to the present. It contains a discussion on the current prospects and challenges faced by these devices, along with a comparative analysis centered on their aerodynamic controllability. General considerations and conclusive remarks are presented after the discussion.

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Section: Plasma Actuatorsmentioning

confidence: 94%

Section: Plasma Actuatorsmentioning

confidence: 99%

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Akhter

Omar

2021

Energies

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“…Furthermore, main objective of both our previous works (Aono et al 2017a(Aono et al , 2017b is to suppress flow separation around the airfoil by the flow control of DBD-PA in order to improve the performance of the airfoil. On the other hand, main objectives of current study are to reduce drag acting on the circular disk by the flow control of coaxial type DBD-PA by changing the effective aerodynamic shape of circular disk and reveal the mechanisms of the drag reduction.…”

Section: Introductionmentioning

confidence: 99%

Mechanisms of drag reduction due to flow control around circular disk using coaxial type dielectric barrier discharge plasma actuator at low Reynolds numbers

Aono¹,

Kimura

Honami

et al. 2019

Fluid Dyn. Res.

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Mechanisms of drag reduction due to flow control around a circular disk using a coaxial type dielectric barrier discharge plasma actuator (DBD-PA) are numerically investigated at Reynolds numbers (Re) of 5000 and 10 000. The disk is placed normal to the freestream direction and the coaxial type DBD-PA is installed on the upstream side of the disk surface. Flow induced by the coaxial type DBD-PA in quiescent air and a time-averaged drag coefficient of the case without the control are in favorable agreement with experimental results. It is found that two phenomena on flow dynamics are responsible for the drag reduction due to the flow control of the coaxial type DBD-PA. First one is the generation of low-pressure region because of an interaction between the induced flow and the freestream on the upstream side. Second is the delayed roll-up motion of the separated shear layer from the edge of the disk. Most of cases demonstrate the reduction of the time-averaged drag and the reduction rate is up to 2.3% at the Re=5000 and 3.0% at the Re = 10 000, respectively. Moreover, the control effects on surface pressure distribution at both Reynolds numbers present trade-off and the large relative diameter of the coaxial type DBD-PA is the favorable impacts in terms of the time-averaged drag coefficient and the drag fluctuation.

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“…This reduces the net electric field and stops the process of ion generation 42 . Many different electrode configurations have been introduced, such as wire-dielectric-wire 43 and ring-dielectric-ring, with time-varying applied voltage to ensure that the accumulated charge is neutralized and the discharge is periodically restarted. The scaling law for this type of discharge has been established 44 together with the effect of governing parameters such as voltage and ambient gas 45,46 .…”

Section: Introductionmentioning

confidence: 99%

Dual-pin electrohydrodynamic generator driven by alternating current

Dau

Dinh

Tran

et al. 2018

Experimental Thermal and Fluid Science

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We report a unique alternating current (AC) driven corona based air-flow generator using symmetrically arranged electrodes. Unlike the conventional configuration where one electrode generates charged ions moving towards the reference electrode, this configuration allows both negative and positive charges to simultaneously move away from the device and generate ion wind in parallel with the electrodes. In comparison with the direct current (DC) driven corona generator, the time oscillating AC field allows the device a better stabilization owing to the independence of ion wind strength from the inter-electrode spacing. Our results by both simulation and experiment showed that when the AC frequency exceeds a threshold value of 1100 Hz, the electric field at the electrode tips is determined dominantly by the charge cloud created in the previous half-cycle, resulting in stronger net electric field and thus stronger ion wind. In addition, the electrode separation in the AC driven corona based generator is less critical above the frequency threshold, yielding a more robust design with minimized susceptibility to manufacturing tolerances and impurities on the electrodes. Moreover, lower voltage levels of the AC driven system allow simpler and more economical design in the high voltage circuit of the AC generator.

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Straight and curved type micro dielectric barrier discharge plasma actuators for active flow control

Cited by 20 publications

References 26 publications

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Review of Flow-Control Devices for Wind-Turbine Performance Enhancement

Mechanisms of drag reduction due to flow control around circular disk using coaxial type dielectric barrier discharge plasma actuator at low Reynolds numbers

Dual-pin electrohydrodynamic generator driven by alternating current

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