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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. - PowerPoint PPT Presentation
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Janusz Podliński, Artur Berendt, Jerzy Mizeraczyk
Centre for Plasma and Laser EngineeringThe Szewalski Institute of Fluid-Flow Machinery
Polish Academy of SciencesGdańsk, Poland
Multi‑DBD actuator with floating interelectrode
for aerodynamic control
Outline
2
Dielectric Barier Discharge (DBD) plasma actuators
• Applications
• Design
Our investigations
• Electrode shape
• Electrode at floating potential
• Multi-DBD plasma actuator
Summary
Actuator ON Actuator ON
DBD plasma actuators
3
Actuator OFF Actuator OFF
Flow visualisation in an aerodynamic channel
with a DBD plasma actuator
DBD plasma actuator for flow modification
Flow
DBD plasma actuators
4
DBD plasma actuator placed on an aerodynamic element
can influence on:
• Boundary layer transition
• Wing tip vortex
• Leading and trailing flow separation
DBD plasma actuators can change parameters of the
airfoils
• Lift force increase
• Drag force decrease
• Noise reduction
5
DBD plasma actuators
Cross-section of the „classic” DBD plasma actuator
Top-side view of the „classic” DBD plasma actuator
6
Experimental set-up for DBD discharge parameters and flow measurements by PIV
Our investigations
7
Our investigations
Up-p=24 kV; Ip=500 mA; f =1,5 kHz
Classic DBD plasma actuators
Without electrode gap With electrode gap 20 mm
Up-p= 48 kV; Ip=20 mA; f =1,5 kHz
8
Saw-like electrodes for DBD plasma actuators
Example of saw-like electrode
Smooth electrode
DBD plasma actuators with smooth and saw-like electrodes
Electrode gap 20 mmUp-p = 52 kV,f = 1.5 kHz
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
Saw-like electrode
9
Maximum flow generated by the actuators with smooth and saw-like electrodes
(d – distance between electrodes in mm)
Flow velocity field measured by PIV
Saw-like electrodes for DBD plasma actuators
Effect of saw-like electrode
Higher flow velocities generated by DBD
DBD plasma actuators with smooth and saw-like electrodes
10
Multi-discharge plasma actuatorsSchematic design
Double DBD plasma actuator possible
‘Classic’ Multi-DBD for actuators
Multi-DBD with floating interelectrodes for actuators
11
Multi-DBD actuator with floating interelectrodes Discharge visualisation - top view
Length of all electrodes: 80 mmHigh voltage electrode width: 10 mmHV to floating interelectrode distance: 0 mmGrounded (1) to HV electrode distance: 0 mm
Floating interelectrode width: 4 mmFloating to grounded (2) electrode distance: 4 mm Grounded electrode width: 3 mm High voltage: Upp = 32 kV, f = 1.5 kHz
12
Length of HV and grounded electrodes: 50 mmLength of floating interelectrodes: 45 mmHigh voltage electrodes width: 15 mmHV and FL interelectrodes in optimum position
Floating interelectrodes width: 3 mmFloating to grounded electrode distance: 6 mm Grounded electrodes width: 3 mm Grounded to floating electrode distance: 13 mm
Dielectric: glass plate – 2 mm thick High voltage: Upp = 32 kV, f = 1.5 kHz
Airflow velocity m/s
Time-averaged streamlines of an airflow induced by the multi-DBD actuator with saw-like floating interelectrodes
Multi-DBD actuator with floating interelectrodes Time-averaged streamlines
13
Experimental set-upfor leading edge flow separation control
Wind tunnel
Test section: 0.6 m x 0.46 m – 1.5 m long, Velocity 100 m/s, Turbulence level 0.1 %
NACA 0012 model:• Chord 200 mm
• Span 595 mm
• Multi-DBD actuator
with saw-like floating
interelectrode
14
Plasma OFF – separated airflow Plasma ON - airflow reattachment
U0 = 15 m/s Chord: 200 mm
Incidence = 11o Re = 200 000
Multi-DBD plasma actuator with saw-like floating interelectrode for leading edge flow separation control
Applied HV: UHV = 15 kV fHV = 1.5 kHz
U0 = 15 m/s Chord: 200 mm
Incidence = 11o Re = 200 000
Leading edge flow separation control - results
Time-averaged flow velocity fields measured by PIV method
Summary
15
The DBD with saw-like electrodes:
• Lower onset voltage,
• More uniform discharge along electrodes,
• Higher airflow velocities than the DBD with smooth electrodes.
The multi-DBD actuator with floating interelectrodes:
• Plasma generation on a large area of the dielectric surface,
• Maximum airflow velocity over 10 m/s ,
• Attractive for aerodynamic applications.