Separation control with nanosecond pulse driven dielectric barrier discharge plasma actuators
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Separation Control with Nanosecond Pulse Driven Dielectric Barrier Discharge Plasma Actuators. Lucio Cota Advisor: Jesse Little Department of Aerospace and Mechanical Engineering University of Arizona Arizona Space Grant Consortium Symposium April 12 th , 2014 Tucson, AZ. Introduction.

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Separation control with nanosecond pulse driven dielectric barrier discharge plasma actuators

Separation Control with Nanosecond Pulse Driven Dielectric Barrier Discharge Plasma Actuators

Lucio Cota

Advisor: Jesse Little

Department of Aerospace and Mechanical Engineering

University of Arizona

Arizona Space Grant Consortium Symposium

April 12th, 2014

Tucson, AZ


Introduction
Introduction Barrier Discharge Plasma Actuators

Flow Separation in Aerodynamics

  • Decreases Lift

  • Increases Drag

Partially Attached Flow via Plasma Actuation

Separated Flow

Caraballo et al, 2014


Dielectric barrier discharge dbd plasma actuator
Dielectric Barrier Discharge (DBD) Plasma Actuator Barrier Discharge Plasma Actuators

  • Two Copper Electrodes separated by a dielectric (Kapton tape)

  • Creates plasma when high voltage is applied (10 kV)


Nanosecond ns dbd
Nanosecond (ns) - DBD Barrier Discharge Plasma Actuators

  • Plasma actuation causes a compression wave due to rapid localized heating

  • Re-energizes the flow for control separation

  • Effects are dependent on driving voltage and frequency of pulses


Objectives
Objectives Barrier Discharge Plasma Actuators

  • Compare positive and negative polarity driving voltages for flow control authority

  • Previous research shows negative polarity generates stronger pressure waves in quiescent air (Dawson et al, 2013)

Positive

Negative


Methods

6 Barrier Discharge Plasma Actuators

Methods

Adjust Parameters to areas of interest

  • Angle of Attack (α)

    • 18 degrees

  • Frequency

    • 200 to 600 Hz

      Measure Static Pressure on test section ceiling


Experimental facilities
Experimental Facilities Barrier Discharge Plasma Actuators

  • Adjustable wall plugs to control Angle of Attack

  • Ceiling pressure taps to measure Static Pressure


Experimental facilities1
Experimental Facilities Barrier Discharge Plasma Actuators

  • Adjustable wall plugs to control Angle of Attack

  • Ceiling pressure taps to measure Static Pressure


Coefficient of pressure c p interpretation
Coefficient of Pressure (C Barrier Discharge Plasma Actuatorsp) Interpretation

Pressure ↓ Velocity ↑

High Velocity Region

Without Plasma

With Plasma

Caraballo et al, 2014


Pressure distribution 200 hz
Pressure Distribution: 200 Hz Barrier Discharge Plasma Actuators

NACA0015, Re = 1.12 x 105 , α = 18°

-Positive and Negative Polarity are near equal at leading edge


Pressure distribution 400 hz
Pressure Distribution: 400 Hz Barrier Discharge Plasma Actuators

NACA0015, Re = 1.12 x 105 , α = 18°

- Negative Polarity is more negative than Positive


Pressure distribution 600 hz
Pressure Distribution: 600 Hz Barrier Discharge Plasma Actuators

NACA0015, Re = 1.12 x 105 , α = 18°

- Positive Polarity behaves similar to Baseline, Negative still effective


Summary
Summary Barrier Discharge Plasma Actuators

200 Hz

  • Positive discharges and Negative discharges have the same effectiveness at the leading edge

    400 Hz

  • Greatest effect from Negative Discharges

    600 Hz

  • Positive Discharge performs similar to baseline

  • Effect by Negative Discharges still present


Conclusion
Conclusion Barrier Discharge Plasma Actuators

  • Both Polarities perform best at low frequencies (preferred frequencies exist)

  • Positive Discharges, at its preferred frequency, has the same influence on Flow Control as Negative Discharges and little to no effect at higher frequencies

  • Negative Discharges show an effect at all frequencies

  • Investigation of input voltage may provide more conclusions


Acknowledgements
Acknowledgements Barrier Discharge Plasma Actuators

This Research was Sponsored by

  • Arizona Space Grant Consortium

  • Air Force Office of Scientific Research

    Special Thanks to

  • UA Department of Aerospace and Mechanical Engineering

  • Robyn Dawson

  • Everyone on the Research Team


Thank you

15 Barrier Discharge Plasma Actuators

Thank You


References
References Barrier Discharge Plasma Actuators

Caraballo, E., T. Sullivan, R. You, and J. Little. "Characterization of the Flow Field over a NACA 0015 Airfoil Using Stochastic Estimation Based on Surface Pressure and Hot Film Measurements." AIAA SciTech 13-17.January (2014)

Dawson, Robert, and Jesse Little. "Characterization of Nanosecond Pulse Driven Dielectric Barrier Discharge Plasma Actuators for Aerodynamic Flow Control." Journal of Applied Physics 113.10 (2013): 103302. Print.


Pulse generator

17 Barrier Discharge Plasma Actuators

Pulse Generator

  • Generates pulses by magnetic compression


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