Characteristics of Drag Reduced Turbulent Boundary Layers Through Pulsed-DC Actuation

Duong, Alan; Corke, Thomas; Thomas, Flint O.

doi:10.2514/6.2020-0098

Cited by 6 publications

(7 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Авторы [196,197] считают, что величина достигнутого снижения сопротивления зависит от количества элементарных вихрей между соседними поверхностными электродами. Это снижение сопротивления экспоненциально увеличивается при уменьшении Re  (Re  -число Рейнольдса, рассчитанное по толщине вытеснения импульса в пограничном слое) как следствие уменьшения количества элементарных вихрей под одновременным контролем.…”

Section: управление ламинарно-турбулентным переходом и турбулентными ...unclassified

“…Это снижение сопротивления экспоненциально увеличивается при уменьшении Re  (Re  -число Рейнольдса, рассчитанное по толщине вытеснения импульса в пограничном слое) как следствие уменьшения количества элементарных вихрей под одновременным контролем. Данное утверждение позволяет провести анализ полученных в [196,197] зависимостей в системе координат «снижение сопротивления -Re  » (рис. 47).…”

Section: управление ламинарно-турбулентным переходом и турбулентными ...unclassified

“…С одной стороны, данные действительно показывают падающую экспоненциальную зависимость между снижением сопротивления и числом Рейнольдса потока. С другой стороны, небольшая экстраполяция зависимостей, приведенных в [196,197], предсказывает наличие области отрицательных абсолютных сопротивлений при низких числах Рейнольдса.…”

Section: управление ламинарно-турбулентным переходом и турбулентными ...unclassified

“…Таким образом, данные [196,197] Плазменный слой вблизи поверхности может быть создан различными способами. Например, в работах [198,199] и более поздних публикациях [200,201] использовались разряды постоянного тока с электродами, расположенными выше или на поверхности профиля.…”

Section: управление ламинарно-турбулентным переходом и турбулентными ...unclassified

See 3 more Smart Citations

Gasdynamic Flow Control by Ultrafast Local Heating in a Strongly Nonequilibrium Pulsed Plasma

Starikovskiy

Aleksandrov

2021

Plasma Phys. Rep.

View full text Add to dashboard Cite

Abstract— The paper presents a review of modern works on gasdynamic flow control using a highly nonequilibrium pulsed plasma. The main attention is paid to the effects based on ultrafast (on the nanosecond time scale for atmospheric pressure) local gas heating, since, at present, the main successes in controlling high-speed flows by means of gas discharges are associated with this thermal mechanism. Attention is paid to the physical mechanisms responsible for the interaction of the discharge with gas flows. The first part of the review outlines the most popular approaches for pulsed energy deposition in plasma aerodynamics: nanosecond surface barrier discharges, pulsed spark discharges, and femto- and nanosecond optical discharges. The mechanisms of ultrafast heating of air at high electric fields realized in these discharges, as well as during the decay of the discharge plasma, are analyzed separately. The second part of the review gives numerous examples of plasma-assisted control of gasdynamic flows. It considers control of the configuration of shock waves in front of a supersonic object, control of its trajectory, control of quasi-stationary separated flows and layers, control of a laminar–turbulent transition, and control of static and dynamic separation of the boundary layer at high angles of attack, as well as issues of the operation of plasma actuators in different weather conditions and the use of plasma for the de-icing of a flying object.

show abstract

Section: управление ламинарно-турбулентным переходом и турбулентными ...unclassified

See 2 more Smart Citations

Gasdynamic Flow Control by Ultrafast Local Heating in a Strongly Nonequilibrium Pulsed Plasma

Starikovskiy

Aleksandrov

2021

Plasma Phys. Rep.

View full text Add to dashboard Cite

show abstract

“…In view of these advantages, DBD-PAs are expected to be widely utilized in applications intended to enhance the performance of fluid machinery. Several studies have been conducted to this end, the most noteworthy of which include flow-separation control over an airfoil by replacing flaps [5][6][7], slats [7][8][9][10], and synthetic jets [11], and investigations on drag-reduction techniques [12][13][14], cylinder flow control for drag and noise reduction [15][16][17], and flame-stability enhancement [18,19].…”

Section: Introductionmentioning

confidence: 99%

Highly responsive multi-flow pattern generation by multi-electrode plasma actuator using a single power supply

Sugimoto¹,

Ogata²

2021

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

A dielectric-barrier-discharge plasma actuator (DBD-PA) is an active flow-control device that uses ionic wind generated by electrohydrodynamic forces. A DBD-PA controls fluid motion and offers quick response without the need for moving parts. Previous studies have proposed methods for generating various flow patterns with a DBD-PA for fluid control. This paper presents a method for generating multiple flow patterns using a multi-electrode DBD-PA that is driven by a single-channel high-voltage power supply with a relay circuit. In contrast, conventional methods of realizing multiple flow patterns involve the use of a multi-channel power supply. Hence, they have the disadvantage of requiring a complicated power supply system. The proposed method succeeded in realizing several induced-flow modes involving the generation of a directionally controllable wall jet, various sizes of vortices, and an upward jet by altering the switching frequency and switching ratio. In addition, our experimental results indicate that the proposed method can control the flow pattern with a significantly short response time. The direction of the wall jet can be switched within tens to hundreds of milliseconds. Therefore, the proposed method combines simplicity and versatility and is expected to facilitate the realization of multifunctional active flow control in various flow fields, such as flow turbulent boundary layer control, thermal diffusion control, gas mixing, and flame-stability enhancement.

show abstract

Minimizing airfoil drag at low angles of attack with DBD-based turbulent drag reduction methods

Zong

Liang

et al. 2023

Chinese Journal of Aeronautics

View full text Add to dashboard Cite

Characteristics of Drag Reduced Turbulent Boundary Layers Through Pulsed-DC Actuation

Cited by 6 publications

References 28 publications

Gasdynamic Flow Control by Ultrafast Local Heating in a Strongly Nonequilibrium Pulsed Plasma

Gasdynamic Flow Control by Ultrafast Local Heating in a Strongly Nonequilibrium Pulsed Plasma

Highly responsive multi-flow pattern generation by multi-electrode plasma actuator using a single power supply

Minimizing airfoil drag at low angles of attack with DBD-based turbulent drag reduction methods

Contact Info

Product

Resources

About