Plasma Virtual Actuators for Flow Control

Choi, Kwing-So; Jukes, Timothy; Whalley, Richard D.; Feng, Li-Hao; Wang, Jinjun; Matsunuma, Takayuki; Segawa, Takehiko

doi:10.4236/jfcmv.2015.31003

Cited by 22 publications

(11 citation statements)

References 27 publications

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“…These five airfoils contain the coefficient of the blade with different intensity of plasma actuated that is based on different voltage triggered for plasma actuation. The arrangement of the airfoil in the full length blade is altered such that the trailing edge airfoil NACA 64618 at the span of 61.5 m is replaced with the airfoil data V 1 , V 2 , V 3 , V 4 , andV 5 , designed using QBlade software with the C L and C d data from . The polar data is obtained by the coefficient, and they are extrapolated to 360° AOA using QBlade software .…”

Section: Rotor Designmentioning

confidence: 99%

Optimized dielectric barrier discharge‐plasma actuator for active flow control in wind turbine

Govindan¹,

Santiago²

2019

Struct Control Health Monit

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The efficiency of horizontal axis wind turbines greatly depends on the efficient utilization of the aerodynamic lift force. The coefficient of lift could be altered using the flow control techniques. The dielectric barrier discharge (DBD)-based plasma actuator is an evolving active flow control technique in which the moment induced in air by DBD plasma activation improves the power capturing capacity of the blades without any mechanical actuation. But due to the offset plasma actuation in extreme wind condition, it would induce structural stress on turbine components. The effect of optimized plasma actuation by varying the voltage amplitude and with a fixed frequency of 24 kHz is to be analyzed. The duty cycle of the plasma actuator is maintained constant at 90%. The optimal point plasma operation would ensure the maximum power production and reduced bending moment of blades. The optimum plasma activation also reduces the power consumption of the actuator. The instantaneous optimum Pareto best is obtained by recursive identification of dynamic system response using non-dominated sorting genetic algorithm 2. The converging points of the algorithm are validated using a NREL FAST 5MW offshore baseline wind turbine model interfaced with MATLAB.

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Section: Rotor Designmentioning

confidence: 99%

Optimized dielectric barrier discharge‐plasma actuator for active flow control in wind turbine

Govindan¹,

Santiago²

2019

Struct Control Health Monit

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“…Position and actuation strategies of these devices are key points in their effectiveness in flow control over aerodynamic surfaces. Many studies have been accomplished over airfoils [65][66][67][68][69][70][71][72], diffusers [73,74], and wind [10, 11 and 75] and turbine [8,9] blades, in order to enhance fluid-dynamic performance. Moreover, the adoption of these devices over landing gears and trailing edge surfaces have demonstrated the possibility to obtain a noise reduction effect [76][77][78].…”

Section: Dbd Aerodynamic Actuators: Flow Manipulationmentioning

confidence: 99%

“…Such a device can be used as a plasma vortex generator (PVG) Figure 14. Vortex formation mechanism induced by a streamwise plasma actuator [8].…”

Section: Dbd Aerodynamic Actuators: Flow Manipulationmentioning

confidence: 99%

“…More recently, they have been used also to control friction drag by delaying transition [4,5] or by oscillating the flow in spanwise direction [6], and to control global instabilities of the flow [2,3,7]. Due to these characteristics, the potential of plasma actuators has been extended to many other applications like for instance tip clearance flow control of turbines [8,9], and wind turbine blades and holder [10,11].…”

Section: Introductionmentioning

confidence: 99%

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Active Flow Control by Using Plasma Actuators

Neretti¹

2016

Recent Progress in Some Aircraft Technologies

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Active flow control has recently received an increasing attention since it allows to directly manipulate the flow-field around a surface only when it is effectively requested. Aerodynamic plasma actuators supplied by a dielectric barrier discharge (DBD) can be used for this purpose. Usually, sinusoidal voltages in the range 5-50 kV peak and frequencies between 1 and 100 kHz are utilized to ignite this plasma typology. The surface discharge produced by these devices is able to tangentially accelerate the flow field by means of the electrohydrodynamic (EHD) interaction. DBDs generate non-thermal plasmas characterized by low input energies and limited temperature increments. Plasma actuators can be easily designed by following the shape of the aerodynamic body and can be used over heat-sensitive surfaces. These aerodynamic devices have demonstrated to produce boundary layer modifications with induced speeds up to 10 m/s. Their use over airfoils, flaps, and blades have shown the possibility to delay the transition between laminar to turbulent regime, to prevent flow separation enhancing lift and reducing drag. Moreover, the adoption of these actuators over landing gears and trailing edges may induce a noise reduction effect. Dielectric materials, electrodes configuration, and supplying waveforms are most relevant parameters to be considered to enhance actuator performance. On a parallel plane, on/off actuation strategy is a key point in the use of these devices when utilized over aerodynamic surfaces impinged within an external flow.

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“…Nevertheless, the new rotor dimensions prevent from achieving a fully attached flow over the entire blade span without the implementation of additional flow control devices. Diverse flow control devices have been proposed for wind turbine applications, such as trailing/leading edge flaps, plasma actuators, turbercled leading edge, or vortex generators (VGs) …”

Section: Introductionmentioning

confidence: 99%

Application of rod vortex generators for flow separation reduction on wind turbine rotor

2018

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This paper focuses on flow control on wind turbine blades. A rod vortex generator (RVG) is proposed. Previous experimental and numerical results obtained for channels and blade sections proved RVGs to effectively enhance the streamwise shear stresses and reduce flow separation. The benefits of application of RVGs to control and decrease the flow separation on horizontal axis wind turbine rotor blades are assessed and presented in the paper. The numerical investigation was conducted with the FINE/Turbo solver from Numeca International, which solves the 3D Reynoldsaveraged Navier-Stokes equations. The validation of the numerical model for the clean case is based on phase VI of the Unsteady Aerodynamics Experiment. At selected operating conditions, flow control devices have proven to reattach the flow locally to the wall and improve the aerodynamic performance of the wind turbine. Additionally, the local implementation of RVGs shows strong effect on flow structure and interaction with the main flow to create a "shielding" effect, preventing further penetration of separation towards blade tip. As a consequence, the positive effect of RVGs exists outside the blade span covered by devices. The obtained aerodynamic improvement shows that RVGs may be used as an alternative to traditional flow control devices applied on wind energy turbines. KEYWORDS flow control, flow separation, NREL phase VI, vortex generator, wind energy 1 | INTRODUCTIONSince the industrial revolution, the world demand for energy has grown at a much faster rate than in all previous human history. As a consequence, man's dependency on fossil fuels and green house gasses emissions has risen ever since. In this context, wind energy is seen as one of the most promising solutions to man's ever-increasing demands of a clean source of energy. 1 The main drawback of wind energy compared with nonrenewable energy sources is the cost of energy (COE). The COE may be reduced by increasing the annual energy production (AEP) or decreasing the operation and maintenance cost. This increase of AEP may be achieved through higher availability of the system, thereby reducing the downtime.Nevertheless, the average availability of the onshore horizontal axis wind turbines ranges from 96% to 99%, which indicates slight scope for improvement. 2 The AEP may be also enhanced by increasing wind turbine and rotor sizes. A larger turbine can capture more energy through its lifetime, decreasing the relative COE per megawatt. The last decades development in the material science, control, and aerodynamics have allowed this growth of wind turbines sizes and a continuous reduction in COE. 3 At the end of 1989, a 300-kW wind turbine with 30-m rotor diameter was state of the art; nowadays, turbines with rotor diameters of up to 160 m (Vestas V164-8MW or V164-9.5MW) have been developed, and the current trend of increasing sizes is expected to continue in the future. 4,5 Presence of flow separation on wind turbine blades leads to increased aerodynamic losses, noise generation, and fatigue ...

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Plasma Virtual Actuators for Flow Control

Cited by 22 publications

References 27 publications

Optimized dielectric barrier discharge‐plasma actuator for active flow control in wind turbine

Optimized dielectric barrier discharge‐plasma actuator for active flow control in wind turbine

Active Flow Control by Using Plasma Actuators

Application of rod vortex generators for flow separation reduction on wind turbine rotor

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