Characterization of Laser Energy Deposition for Active Flow Control Clark Pederson University of Arizona Advisor: Dr. Jesse Little, Assistant Professor,

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Presentation transcript:

Characterization of Laser Energy Deposition for Active Flow Control Clark Pederson University of Arizona Advisor: Dr. Jesse Little, Assistant Professor, Department of Aerospace and Mechanical Engineering, University of Arizona Arizona Space Grant Consortium April 12 th, 2014 Tucson, AZ

Acknowledgements NASA Space Grant Director: Susan Brew NASA Space Grant Consortium Research Group, including: – Robyn Dawson – Jared Hainsworth Air Force Office of Scientific Research

Background of Plasma Actuators Plasma actuators use high voltage pulses to generate rapid localized near surface gas heating. These actuators have proven successful in preventing stall on airfoils at high angle of attack. Vorticity of an Airfoil without Plasma actuator Vorticity of an Airfoil with Plasma actuator Images from Little et al, 2012.

Brief Summary Research Question: Can lasers be used in place of plasma plasma actuators for studies of thermoacoustic flow control mechanisms? Lasers have some advantageous qualities in comparison to plasma actuators. – Higher energy – More capability for spatial variation – Disadvantage is low frequency

Laser-Produced Plasmas Shock waves from plasma actuators were compared to those generated by laser ablation. The laser superheats an aluminum target, turning the surface of it into plasma. Temperatures on the order of 900 K. Laser Line Shock Wave Aluminum

Experimental Setup Nd:YAG Laser LED Aluminum Plate ICCD Camera Knife Edge Cylindrical Lens Spherical Lens Prism Concave Mirror Mirror Concave Mirror

Schlieren Imaging Schlieren imaging visualizes changes in density of the air. Shock waves appear as lines in the air.

Image Analysis A custom-made MATLAB program was used to analyze the images. It located the position of the shocks It qualitatively determined the strength of the shocks using the intensity of the lines. Shock Wave

Results: Shock Speed

Results: Shock Strength

What’s Next? These results confirm that the shock speeds are similar; both go to Mach 1 eventually. Lasers produce stronger shocks. Pulsed lasers can be used to approximate higher-power plasma actuators. This allows future studies of flow control in wind tunnels with lasers in place of plasma actuators.

Thank you!

References 1.“Separation Control with Nanosecond-Pulse-Driven Dielectric Barrier Discharge Plasma Actuators,” Little, Jesse et. al, AIAA JOURNAL Vol. 50, No. 2, February “Characterization of nanosecond pulse driven dielectric barrier discharge plasma actuators for aerodynamic flow control,” Robert Dawson and Jesse Little, Journal of Applied Physics, 113 (2013), Image from wav.html

Plasma Actuators Called ns-DBD (or Nanosecond-Pulse-Driven Dielectric Barrier Discharge) Plasma Actuators These excite natural instabilities in flow. Most commonly, they excite points of flow separation. Image from Dawson and Little, 2013 Detail of an Plasma Tape Actuator

Schlieren Images Image from Reference 3