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Janusz Podliński , Artur Berendt, Jerzy Mizeraczyk

Multi‑ DBD actuator w ith floating interelectrode f or aerodynamic control. Janusz Podliński , Artur Berendt, Jerzy Mizeraczyk. Ce ntre for Plasma and Laser Engineering The Szewalski Institute of Fluid - Flow Machinery Polish Academy of Sciences Gdańsk, Poland. Outline.

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Janusz Podliński , Artur Berendt, Jerzy Mizeraczyk

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  1. Multi‑DBDactuator withfloatinginterelectrode for aerodynamic control Janusz Podliński, Artur Berendt, Jerzy Mizeraczyk Centre for Plasma and Laser Engineering The Szewalski Institute of Fluid-Flow Machinery Polish Academy of Sciences Gdańsk, Poland

  2. Outline • Dielectric Barier Discharge (DBD) plasmaactuators • Applications • Design • Ourinvestigations • Electrodeshape • Electrodeatfloatingpotential • Multi-DBDplasmaactuator • Summary

  3. DBD plasma actuators DBD plasma actuator for flow modification • Actuator OFF Flow • Actuator ON • Flow visualisation in an aerodynamic channel with a DBD plasma actuator

  4. DBD plasma actuators • DBD plasmaactuatorplaced on an aerodynamic element can influence on: • Boundarylayertransition • Wingtipvortex • Leading and trailingflowseparation • DBD plasmaactuatorscanchangeparameters of theairfoils • Lift forceincrease • Drag forcedecrease • Noisereduction

  5. DBD plasma actuators • Top-side view of the „classic” DBD plasma actuator • Cross-section of the „classic” DBD plasma actuator

  6. Our investigations Experimental set-up for DBD discharge parametersand flow measurementsby PIV

  7. Our investigations • Classic DBD plasmaactuators • Withoutelectrode gap Withelectrode gap 20 mm Up-p=24 kV; Ip=500 mA; f =1,5 kHz Up-p= 48 kV; Ip=20 mA; f =1,5 kHz

  8. Saw-like electrodes for DBD plasma actuators Saw-likeelectrode Example of saw-like electrode DBD plasma actuators with smooth and saw-like electrodes Electrode gap 20 mm Up-p = 52 kV, f = 1.5 kHz Smoothelectrode The discharge for actuators with smooth and saw-like electrode • Effect of saw-like electrode • DBD starts at lower voltage • More uniform discharge along electrodes

  9. Saw-like electrodes for DBD plasma actuators DBD plasma actuators with smooth and saw-like electrodes Flow velocity field measured by PIV Maximum flow generated by the actuators with smooth and saw-like electrodes (d – distance between electrodes in mm) • Effect of saw-like electrode • Higher flow velocities generated by DBD

  10. Multi-discharge plasma actuators Schematic design ‘Classic’ Multi-DBD for actuators Double DBD plasma actuator possible Multi-DBD with floating interelectrodes for actuators

  11. Multi-DBD actuator with floating interelectrodes Discharge visualisation - top view Length of all electrodes: 80 mm High voltage electrode width: 10 mm HV to floating interelectrode distance: 0 mm Grounded(1) to HV electrode distance: 0 mm Floating interelectrode width: 4 mm Floatingto grounded (2) electrode distance: 4 mm Groundedelectrodewidth: 3 mm High voltage: Upp = 32 kV, f = 1.5 kHz

  12. Multi-DBD actuator with floating interelectrodes Time-averaged streamlines Time-averaged streamlines of an airflow induced by the multi-DBD actuator with saw-like floating interelectrodes Airflow velocity m/s Dielectric: glassplate – 2 mm thick High voltage: Upp = 32 kV, f = 1.5 kHz Floating interelectrodes width: 3 mm Floatingto groundedelectrodedistance: 6 mm Groundedelectrodes width: 3 mm Grounded to floating electrode distance: 13 mm Length of HV and groundedelectrodes: 50 mm Length of floatinginterelectrodes: 45 mm High voltageelectrodeswidth: 15 mm HV and FL interelectrodesin optimum position

  13. Experimental set-up for leading edge flow separation control Wind tunnel • NACA 0012 model: • Chord 200 mm • Span 595 mm • Multi-DBD actuator • with saw-like floating interelectrode Test section: 0.6 m x 0.46 m – 1.5 m long, Velocity 100 m/s, Turbulence level  0.1 %

  14. Leading edge flow separation control - results Time-averaged flow velocity fields measured by PIV method Applied HV: UHV = 15 kV fHV = 1.5 kHz Multi-DBD plasma actuatorwith saw-like floating interelectrodefor leading edge flow separation control Plasma OFF – separated airflow Plasma ON - airflow reattachment U0 = 15 m/s Chord: 200 mm Incidence = 11o Re = 200 000 U0 = 15 m/s Chord: 200 mm Incidence = 11o Re = 200 000

  15. Summary • The DBD with saw-like electrodes: • Lower onset voltage, • More uniform dischargealongelectrodes, • Higher airflow velocities than theDBDwith smooth electrodes. • Themulti-DBDactuatorwith floating interelectrodes: • Plasmagenerationon a largearea of thedielectricsurface, • Maximumairflow velocity over 10 m/s , • Attractive for aerodynamicapplications.

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