Control of transitional and turbulent flows using plasma based actuators. If the transition occurs early in the boundary layer, then separation may be reduced or completely eliminated. These plasma actuators consist of using the dischargeinduced electric wind within the boundary layer to modify its properties and then to actively manipulate the air. Boundary layer flow control using ac discharge plasma.
When the strouhal number of actuation is varied, the transition does not. Demonstration of separation control using dielectric barrier discharge plasma actuators. The surface discharge produced by these devices is able. On the one hand, wind tunnel investigations are conducted, as well as linear stability analyses, in order to study the effect of a steady operated dbd actuator on boundary layer stabilization. A particular type of plasma actuator that has gained wide use is based on a single dielectric barrier discharge sdbd mechanism that has desirable features for use in air at atmospheric pressures.
The effectiveness of active flow control of boundarylayer separation using a phasedarray dielectric barrier discharge dbd plasma actuator has been documented under reynolds number and pressure gradient conditions typical of lowpressure turbine airfoils. Experimental investigation of influence of sliding. The research involved both numerical and experimental investigations of plasma flow control for a few different sbli configurations. Boundary layer control includes any mechanism or process through which the. As to the 3d boundary layers, recent applications of plasma actuators were focused on the crossflow instability, governing the transition on a swept wing at cruise condition 411. The boundary layer s characteristics induced by ac dbd plasma actuators and applied by the actuators to delay the boundary layer transition on airfoil at ma 0. Largeeddy simulations have been conducted to investigate the mechanisms of separatedflow control using a dielectric barrier discharge plasma actuator at a low reynolds number. Pdf turbulent boundarylayer control with plasma actuators. The integral control effect of the symmetrical plasma actuator is described by the force measurements and particle image velocimetry piv results.
This part is dedicated to a few typical examples of subsonic airflow control by nonthermal plasma actuators. In fact, plasma actuators operated in continuous and repetitively pulsed modes have been shown to delay transition when a boundary layer trip was placed on a flat plate upstream the actuators. One of the electrodes is covered by the dielectric layer and is completely insulated from the other one, which is exposed to the atmosphere in the top of the dielectric layer. This work is concerned with the response of a blasius boundary layer to dielectricbarrierdischarge dbd plasma actuators for the purpose of using these devices in bypass transition control. Transition control in a threedimensional boundarylayer. Multiple encapsulated electrode mee plasma actuator. Jahangirian aerospace engineering department, amirkabir university of technology, tehran, iran corresponding author email. Usually, sinusoidal voltages in the range 550 kv peak and frequencies between 1 and 100 khz are utilized to ignite this plasma typology. Airflow control by nonthermal plasma actuators iopscience. Dbd plasma actuators are simple devices comprising two electrodes separated by a dielectric layer. The use of plasma actuators for active transition control in a flatplate boundary layer is studied numerically. Layer transition control over an airfoil using a dbd plasma actuator. Force measurements, piv and tufts flow visualization were used to characterize the effect of actuation. A spanwise uniform body force is introduced using dielectric barrier discharge plasma actuators, to either force against or along the local crossflow component of the boundary layer.
The objective of the project is to control natural boundarylayer transition through the use of dielectric barrier discharge dbd plasma actuators. Layer flow using dielectric barrier discharge plasma actuators, pamm on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Aerodynamic plasma actuators supplied by a dielectric barrier discharge dbd can. The effect of forcing on the stability of the boundary layer is analysed using a simplified model proposed by serpieri et al. Part of the notes on numerical fluid mechanics and multidisciplinary design book series nnfm. Physics and modelling of ehd effects and boundary layer. Dielectric barrier discharge microplasma actuator for flow. Stabilizing a laminar boundarylayer using plasma actuators the gradients of the electric field should be of the same value like in the model of jayaraman et al. Several researchers have demonstrated that the dbd plasma actuators suppress flow separation 12, and control the boundary layer transition 14, 15. Boeuf laboratoire plasma et conversion denergie laplacegrephe cnrs, universite paul sabatier, inp, toulouse. A force balance and timeresolved piv were used to measure the lift and drag coefficients and to study the velocity fields, respectively.
Physics and modelling of ehd effects and boundary layer control with surface discharge plasma actuators j. Schematic of dbd plasma actuator for flow control applications. Plasma based flow control is one of the most promising techniques for aerodynamic problems, such as delaying the boundary layer transition. Active control of bluffbody flows using plasma actuators. The research investigated the potential for dbd plasma actuators to suppress flow separation caused by a shock in a turbulent boundary layer. Closedloop stall control on a morphing airfoil using hot.
In this section, the turbulent boundary layer separation control over the wingbody configuration with the symmetrical plasma actuator was studied. Numerical study of the control of tollmienschlichting. May 25, 2018 dielectric barrier discharge dbd plasma actuators have several applications within the field of active flow control. Iutam abcm symposium on laminar turbulent transition experimental and numerical study of boundary layer transition control over an airfoil using a dbd plasma actuator n. Turbulent boundary layer control based on dbd plasmaactuator.
Edouard belin, bp74025, 31055 toulouse cedex 4, france abstract. Quiescent flow and wind tunnel tests were performed to gain additional physical insights into flow control for automotive aerodynamics using surface dielectric barrier discharge plasma actuators. Successively accelerated ionic wind with integrated. State key laboratory of aerodynamics, mianyang sichuan, china the technology of plasma active flow control is a new active control technology.
Specifically, high speed magnetogasdynamic plasma actuators are of interest. Their use over airfoils, flaps, and blades have shown the possibility to delay the transition between. The flow separation is induced on a curved plate installed in the test section of a lowspeed wind tunnel. Active flow control by using plasma actuators intechopen. These aerodynamic devices have demonstrated to produce boundary layer. The control mechanism for ac dbd plasma actuators arises from an electrohydrodynamic ehd effect. Turbulent boundary layer separation control by the plasma actuator around a wingbody configuration at high reynolds numbers has also been investigated. Closedloop stall control on a morphing airfoil using hotfilm sensors and dbd actuators jonathan poggie, carl p.
Collisions between the charged species in the plasma and neutral particles near the surface generate a low speed umax dbd surface discharge generates nonthermal plasma allowing to modify the boundary layer of airflow. In this case, the ability of this kind of plasma actuators to delay transition has been. Turbulent boundary layer control based on dbd plasma. Experimental control of sweptwing transition through base. Numerical simulations of flow separation control in low. The nonthermal plasma actuator operates at atmospheric pressure and compared with conventional types of actuators for flow control, has several advantages besides its simple construction, such as no moving parts and fast response 3, 4. The nearwall structures modified by the spanwise travelling waves were studied using the piv technique, while the associated turbulence statistics were. The research involved the development of a dbd based lfc system in which plasma actuators were used to augment the most fundamental of boundary layer flows, the flat plate, blasiustype. Actuator e ectiveness was demonstrated up to mach 0. Separation control, wake control, aircraft noise reduction, modification of velocity fluctuations, or boundary layer control are just some examples of their applications. The use of dbd plasma actuators allows for a dynamic control that can respond to changing flight conditions, which is difficult to achieve with traditional roughness elements. Experimental and numerical study of boundary layer. Numerical simulation of flow separation control using multiple dbd plasma actuators r.
Interest in plasma actuators as active flow control devices is growing rapidly due to their lack of mechanical parts, light weight and high response frequency. Pdf active flow control by using plasma actuators researchgate. The present work focuses on the passive open loop control of boundary layer streaks using plasma actuators, but the control of the transition process has been considered using a number of different nonplasma methods. In another case, neutral gas flow is considered over a 5 deg conical crosssection for demonstration of active control using pulsed direct current and dielectric barrier discharges. The experiments have been carried out on a natural laminar flow airfoil in a wind tunnel and combine two methods previously used for transition control purposes with dbd plasma actuators. In the present study, the mechanisms are classified according to the means of momentum injection to the boundary layer. Damping of the longitudinal streak in the boundary layer. Control of noise from a cascade of flat plates by using dbd plasma actuators hiroshi yokoyama1, makoto kusumoto2, and akiyoshi iida3 1,2,3 department of mechanical engineering, toyohashi university of technology 11 hibarigaoka, tempaku, toyohashi, aichi 4418580, japan abstract. Nanosecond pulsed dielectric barrier discharge plasma. This work reports on the development of a novel hybrid transition control method for single dbd plasma actuators. Oct 18, 2019 opaits df, roupassov dv, starikovskaia sm, starikovskii ay, zavialov in, saddoughi sg 2005 plasma control of boundary layer using lowtemperature nonequilibrium plasma of gas discharge. Particularly, dbd plasma actuators show their ability in boundary layer control, 345 6 7 delaying the separation on airfoils and turbine blades, 8,9 and manipulation of the laminar to. Turbulent boundary layer separation control using plasma. The effect of forcing on the stability of the boundary layer is analysed using a simpli.
Grundmann and tropea studied the boundary layer control using the ac dbd plasma actuator and found that the actuator can damp the perturbations significantly 25 25. Their dbd plasma actuators were aligned in the streamwise direction to produce forcing along the spanwise direction. To determine the effectiveness of plasma actuators for various plasma actuator configurations, an experimental system was designed that included the ability to perform current. In particular, asymmetric dielectric barrier discharge dbd plasma actuators are known to be e ective ehd device in aerodynamic control, 4, 5. Ahmed naguib professor of mechanical engineering michigan state university. Experimental damping of boundarylayer oscillations using dbd plasma actuators. The plasma actuators consist of two electrodes that are located on a surface separated by a dielectric material as shown in fig. In this study, dbd plasma actuators have been found to have the ability to greatly modify the nearwall region of the turbulent boundary layer with a potential to reduce skinfriction drag. Such techniques focus on the manipulation of the boundary layer, a thin layer located close to the wall of an object travelling through a fluid. Numerical study of boundary layer separation control using. Boundary layer control using a dbd plasma actuator aerospace. Issue 6 june 20 boundary layer transition control using dbd plasma actuators al0602 2 experimental setup these experiments have been conducted in the subsonic openreturn juju wind tunnel located at the research facilities of onera toulouse. This paper presents experimental and numerical investigations dealing with 2d boundarylayer transition control on an onerad airfoil using dielectric barrier.
Conclusion in this article, an experimental and numerical work on the eiects of dbd plasma actuators on the boundary layer around an onerad airfoil have been presented. One electrode is exposed to the airflow and the other one is encapsulated between the. Flow separation control using nanosecond pulse driven dbd. Control of transitional and turbulent flows using plasma. By measuring the augmentation to the velocity profile of the boundary layer brought about by the lfc system, the stability of the flow was able to be. Experiment run by prince ghosh and norbert gratzl and advised by steve hostler, phd. Experimental investigations on characteristics of boundary.
Nonthermal surface plasma actuation is evaluated for effective shockwave induced boundary layer separation control within supersonic inlets. For aerodynamic applications they can be used as flow control devices to delay separation and augment lift on a wing. The exposed and covered electrodes of each actuator had no gap between them with their plasmagenerating edges centered at 90. Effect of plasma actuator control parameters on a transitional flow. The characteristics of a dielectric barrier discharge dbd plasma actuator when exposed to an unsteady flow generated by a shock tube is examined. Besides the flow separation control, due to the surfaced ionic wind induced by ac dbd, much research has been devoted to the manipulation of boundary layer and transition. Boundary layer control using a dbd plasma actuator. Therefore, dbd plasma actuators are usually designed to be located at the regions where the aerodynamic characteristics alter greatly as incoming.
A highvoltage ac supplied to the electrodes causes. Compared to other flow control techniques, these new actuators are simple, robust and devoid of moving mechanical parts, which make them ideal for aerodynamic applications. A thin flexible asymmetric dbd actuator was used in our study, each elementary dbd was made with two copper electrodes of 35 mum in thickness and 6 mm in width. Active flow control has recently received an increasing attention since it allows to directly manipulate the flowfield around a surface only when it is effectively requested. The diverse applications of dbd plasma actuators include boundary layer flow control 78 9 10, separation control 111214, wake control 15,16, aircraft noise reduction 17 and. Aerodynamic plasma actuators supplied by a dielectric barrier discharge dbd can be used for this purpose. Pdf active flow control has recently received an increasing attention since it allows to directly manipulate the flowfield. Dielectric barrier discharge dbd plasma actuator is one of the active flow control devices that have been successfully used in aerodynamic flow control applications. The experiment has been conducted in a subsonic windtunnel for freestream velocities up to 24 ms and for two di. On the progress of dbd plasma actuator in boundary layer control. Additionally, a numerical investigation showed that the ns dbd plasma actuator can control a shockwave boundary layer interaction in a freestream mach number of 2. The characteristics of dielectric barrier discharge dbd plasma actuators as active flow control devices were studied in this thesis. Dbd plasma actuator for active flow control youtube.
Mechanisms for laminar separatedflow control using. The full unsteady twodimensional incompressible navierstokes equations are solved with a perturbation formulation using a finite volume discretization. Active control of laminar boundary layers with dielectric barrier discharge dbd plasma actuators pas has made considerable progress in the last 15 years. Plasma actuators for boundary layer control of next. Hybrid transition control approach for plasma actuators. The recent advent of dielectric barrier discharge dbd plasma actuators can potentially provide a robust method for the control of turbulent boundary layer separation. Several researchers have demonstrated that the dbd plasma actuators suppress flow separation 12, and control the boundary layer transition 14,15. Control of noise from a cascade of flat plates by using dbd. Armour college of engineerings mechanical, materials, and aerospace engineering department will welcome dr. Typical pitot velocity profile of a dbd plasma actuator red line.
Transition control with dielectric barrier discharge plasmas. The important part of this investigation is to understand the mechanism of drag reduction and the associated changes in the structure of the turbulent boundary layer. Turbulent boundary layer separation control by using dbd. Investigating the influence of dbd plasma actuators on skin friction. The characteristics of a dielectric barrier discharge dbd plasma actuator when exposed to an unsteady flow generated by a. Experiment run by prince ghosh and norbert gratzl and advised. Control of flow separation from the deflected flap of a high. Laminar flow control of a flat plate boundary layer using. Stabilisation of a threedimensional boundary layer by. Using a rans code for future computations will allow to compute the velocity overshoot. First, the aerodynamic characteristics of ionic wind were studied, and a maximum induced velocity of 3. Specifically, during steady operation, the energy of a disturbance introduced via an array of static cylindrical roughness elements was reduced by up to 68%, as shown by hanson et al. Usually, sinusoidal voltages in the range 550 kv peak and frequencies between 1 and 100 khz are utilized to.
China aerodynamics research and development center, mianyang sichuan,china 2. Flowfieldcharacteristics generated by dbd plasma actuators. Actuators and sensors for flow control monday, 25 june 2018 1400 hrs. Thomas institute for flow physics and control university of notre dame notre dame, in 46556 email. Dielectric barrier discharge plasma actuator for flow control. Thus, considerable researches have been carried out on dbd plasma actuators over the past decade 3. Transition control in a threedimensional boundary layer by direct attenuation of nonlinear crossflow vortices using plasma actuators. Plasma actuators have recently been shown to negate the effect of the transient growth instability occurring in a blasius boundary layer for the purpose of delaying bypass transition. Experimental and numerical study of boundary layer transition.
Meedbd plasma actuator effect on aerodynamics of a naca0015. Ir measurements for quantification of laminar boundary. Transition control in a threedimensional boundarylayer flow. Boundary layer transition control using dbd plasma actuators. Stabilization of boundary layer streaks by plasma actuators. Turbulent boundarylayer control with dbd plasma actuators.
On the progress of dbd plasma actuator in boundary layer control a jafarimoghaddam1 and s aberoumand2 1department of aerospace engineering, k. Active flow control using dielectric barrier discharge dbd plasma actuators was investigated to reattach the simulated boundary layer separation on the suction surface of a turbine blade at low reynolds number, re 1. Single dielectric barrier discharge plasma enhanced. Numerical simulation of flow separation control using. Separation flow control of a generic ground vehicle using an. Active noise control of bluffbody flows using dielectric. In these, localized ionization is produced close to the wall surface and then the flow is accelerated using strong magnetic fields. Transition delay or even suppression has its merits not only in lower wall shear stress and frictional drag of laminar as opposed to turbu. Corke, the clark chair professor of engineering in the aerospace and mechanical engineering department at the university of notre dame, on friday, april 5th, to present his lecture, turbulent boundary layer drag reduction using pulseddc plasma actuation. However, flow control using a dbd plasma actuator at highspeed airflow is confronted by the difficulty of producing sufficient ionic wind for the flow control. Demonstration of separation control using dielectric. The plasma actuators consist of a spanwiseperiodic array of high voltage electrodes, which are oriented to produce streamwise vortex pairs. A dielectric barrier discharge dbd was used and it was called a plasma actuator.
These actuators generate a nonthermal surface discharge, which induces a momentum addition tangentially and close to the wall. Turbulent boundary layer control has been investigated experimentally using a lowspeed wind tunnel at the university of nottingham, with an overall aim of achieving skinfriction drag reduction. Shock generation and control using dbd plasma actuators. The aspect concerning the control of highspeed airflows by thermal plasmas will not be presented here. Boundary layer transition control using dbd plasma. Flow separation control using nanosecond pulse driven dbd plasma actuators chris rethmel, jesse little1, keisuke takashima, aniruddha sinha2, igor adamovich and mo samimy department of mechanical and aerospace engineering, the ohio state university, 2300 west case road, columbus, ohio 432357531, usa received date. First pioneering experiments have motivated numerous researchers to gain a deeper insight into the underlying working principles and corresponding quantification of the actuator performance. Active noise control of bluffbody flows using dielectric barrier discharge plasma actuators alexey v. Numerical simulation of flow separation control over a hump. Receptivity of laminar boundary layers to spanwiseperiodic.
Toosi university of technology, tehran, iran 2department of mechanical engineering, islamic azad university, takestan, iran a. A single dbd plasma actuator is operated on the pressure side of the glove to delay natural laminarturbulent transition while an infra red ir camera is mounted below the wing allowing a measurement of. Dbd plasma actuators for flow control are usually composed of two electrodes separated by a dielectric layer with typical thickness of around 1 mm, as shown in figure 1. The remainder of this work is dedicated to understanding the mechanisms behind dbd plasma actuators and how effective they are when used in preventing flow separation along a test airfoil, and more specifically, the impact of using multiple actuators for flow control. Effects of input voltage on flow separation control for. Stabilization of crossflow instability with plasma. Experimental analysis of dielectric barrier discharge plasma.
Separation control using plasmas actuators stationary and oscillating airfoils, in. Turbulent boundarylayer control with plasma actuators. Plasma actuators are electrical devices that generate a wall bounded jet without the use of any moving parts. The results demonstrate the need for utilization of multiple actuators for controlling a largely separated flow. Inflight experiments for laminar boundary layer stabilization are conducted on a laminar flow wing glove, mounted on a manned motor glider. Flow separation control over an airfoil with nanosecond pulse. Among the other strategies, direct damping of the crossflow vortices in the boundary layer.
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