Adaptive control of low-Reynolds number aerodynamics in uncertain environments: Part 1. Disturbance regimes and flow characteristics

Cho, Young-Chang; Shyy, Wei

doi:10.1016/j.compfluid.2013.04.013

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Another study of possible flow separation and its suppression by DBD actuators in uncertain operating conditions is given. 124 The authors report that the mitigation of fluctuating forces is achieved by modifying the wall pressure near the actuator as well as by promoting vortex evolution. Finally, the same pair of authors also studied means to control both dynamic stall and the evolution of separation bubbles in a disturbed.…”

Section: Classification and Description Of Flow Control Methodsmentioning

confidence: 99%

Current state and future trends in boundary layer control on lifting surfaces

Svorcan

Wang

Griffin

2022

Advances in Mechanical Engineering

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Successful flow control may bring numerous benefits, such as flow stabilization, flow reattachment, separation delay, drag reduction, lift increase, aerodynamic performance improvement, energy efficiency increase, shock delay or weakening, noise reduction, etc. For these purposes, many different flow control devices, which can be classified as passive, semi-active and active, have been designed and tested. This review paper aims to highlight the most promising and commonly employed boundary layer control methods as well as outline their potential in specific applications in aerospace and energy engineering. Referenced studies, performed on various geometries (flat plates, channels, airfoils, wings, blades, cylinders), are primarily numerical or experimental. Although enhanced aerodynamic performance is achieved in many cases, further research is required to draw general conclusions. This paper aims to demonstrate that, in the future, we may expect further developments of flow control actuators, as well as their increased application.

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Section: Classification and Description Of Flow Control Methodsmentioning

confidence: 99%

Current state and future trends in boundary layer control on lifting surfaces

Svorcan

Wang

Griffin

2022

Advances in Mechanical Engineering

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“…We might hypothesize that the efficiency of the unsteady plasma actuation could be dependent on different parameters, including the electrical and geometrical characteristics of the DBD and also the characteristic of the regime of the flow to be controlled [45]. For example, if the frequency of actuation does not match the natural frequencies of the flow, either the actuation is not in the optimum mode or the perturbation injected by the plasma actuator is destabilizing the flow in a negative way.…”

Section: Influence Of Bust Conditions On Dominant Frequenciesmentioning

confidence: 99%

“…Also, efficiency of momentum injection and mixing will be reduced when the free stream velocity is large or the boundary layer is too energetic (turbulent boundary layer). Thus when the flow velocity is higher, the flow structure is less receptive to the unsteady disturbances produced by the plasma actuator and the effect of unsteady actuation would tend to decrease [46]. For example, Asghar et al [47] and Sulaiman et al [48] have shown that the Reynolds number could be used as a scaling parameter for considering the effectiveness of the DBD plasma actuator.…”

Section: Influence Of Bust Conditions On Dominant Frequenciesmentioning

confidence: 99%

Comparison of DBD plasma actuators flow control authority in different modes of actuation

Abdollahzadeh

Páscoa

Oliveira

2018

Aerospace Science and Technology

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The principal mechanisms by which DBD plasma actuators influence flow characteristics, and are thus able to control that flow, depend strongly on their modes of actuation. Here two different modes based on steady and unsteady actuation are compared and investigated. A simple sinusoidal voltage distribution and a duty cycled sinusoidal voltage were considered for these purposes. Leading edge separation around a stalled NACA 0012 airfoil at Re = 3 × 10 6 is considered as test case. A simplified phenomenological model which uses the correct scale of the plasma body force is considered for the modeling of the plasma actuator effects. The steady actuation results show that flow control can be effectively achieved by this mode of operation with continuous injection of momentum in the boundary layer. Unsteady actuation with an imposed frequency equal to the calculated natural frequencies of the flow gives rise to a resonance actuation effect.

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“…The phenomenological model developed by Shyy [9] is used extensively due to its simplicity and ease of implementation. One of the more recent examples of its use is the implementation by Riherd and Ray [4] to model a serpentine configuration of a SDBD PA along a flat surface (Figure 1 Cho and Shyy [10,11] In another work, Zhang et al [12] use a PA to prevent flow separation at a rounded trailing end of an elliptical NCCR 1510-7067N airfoil at Re = 5.8 • 10 6 and M = 0.12.…”

Section: Linear Electric Field Modelmentioning

confidence: 99%

Numerical analysis of Dielectric Barrier Discharge Plasma Actuators for supersonic flow applications

Murzionak¹

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Surface Dielectric Barrier Discharge Plasma Actuator (SDBD PA) is a device that allows for a flow control near a surface of an object. In its simplest form the device consists of one electrode exposed to the atmosphere, dielectric and encapsulated grounded electrode. The device generates strong electric due to high voltage applied to the exposed electrode. Under the effect of the strong electric field the gas in the atmosphere is ionized and turns into plasma, which is manipulated by changing the electric field. The energy from the plasma is transferred to the surrounding gas through particle collisions allowing for the airflow control.The current work is concentrated on the supersonic applications of SDBD PA and aims at answering two questions:• What effects does supersonic shock have on plasma generated by SDBD PA?• What effects does SDBD PA have on supersonic shock?To answer these questions an OpenFOAM solver was developed that allows to simulate plasma within a supersonic flow. The solver is based on electron-positive nitrogen ions drift-diffusion model for plasma. Several simulations are performed to observe the plasma behaviour: plasma propagation through a frozen shock along a flat plate, supersonic flow under free-slip and no-slip conditions around a wedge with SDBD PA at the tip of the wedge. The Mach number varied from 1.3 to 2, depending on the simulation. φ E V Electric potential Superscript * Excited molecules Subscript c Charge e Electrons i Ions k Species k (e.g. ions, electrons) p Positive ions xxi

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Adaptive control of low-Reynolds number aerodynamics in uncertain environments: Part 1. Disturbance regimes and flow characteristics

Cited by 8 publications

References 22 publications

Current state and future trends in boundary layer control on lifting surfaces

Current state and future trends in boundary layer control on lifting surfaces

Comparison of DBD plasma actuators flow control authority in different modes of actuation

Numerical analysis of Dielectric Barrier Discharge Plasma Actuators for supersonic flow applications

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