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Title:Characterization of thermo-chemical properties of electric arc plasma actuators
Author(s):Sanders, Bradley
Advisor(s):Glumac, Nick G.; Elliott, Gregory S.
Department / Program:Mechanical Sci & Engineering
Discipline:Mechanical Engineering
Degree Granting Institution:University of Illinois at Urbana-Champaign
Subject(s):Plasma actuators
Plasma actuators for supersonic flow control
Localized arc filament plasma actuator (LAFPA)
Pulsed plasma jet
High-speed flow control
Supersonic flow control
Mach 3 cross-flow thermal properties
Spectroscopic measurements
Plasma temperature
Joule heating
Joule heating effect
Time-resolved spectroscopy
Spatially-resolved spectroscopy
Schlieren imaging
Mach 3 boundary layer disturbance
Plasma temperature time dependence
Temporal Dependence of thermal properties
Nitrogen second positive system
High-resolution plasma spectroscopy
N2 second positive system
Plasma rotational temperatures
LAFPA rotational temperatures
LAFPA vibrational temperatures
Plasma vibrational temperatures
LAFPA rotational temperature
Plasma rotational temperature
LAFPA vibrational temperature
Plasma vibrational temperature
Pulsed plasma jet injection
Plasma-induced bow shock
Pulsed plasma jet injection in a mac 3 cross-flow
Electric arc plasma actuators
Mach 3 boundary layer plasma actuation
Mach 3 cross-flow plasma actuation
High-speed flow plasma actuation
Abstract:The potential of plasma actuators for high-speed flow control has motivated significant recent research, particularly focusing on the physics and applications of localized arc filament plasma actuators (LAFPAs) and pulsed plasma jets. In an effort to better understand the physics behind the effect that results in the flow actuation of these devices, the thermal properties of the plasma in a LAFPA were investigated by employing high-resolution, time-resolved and low- and intermediate-resolution, spatially-resolved spectroscopy. The high-resolution, time-resolved experiments yielded a temperature history over the duration of a plasma pulse. The rotational and vibrational temperatures of the N2 in the plasma were seen to rise significantly as the pulse progressed despite the most intense emission occurring at the early times in the pulse. The low-resolution, spatially-resolved experiments characterized the behavior of four key excited species in the plasma during a pulse: atomic tungsten (W), NO, N2, and OH. Significant spatial variation and evolving spectral features were demonstrated within the first microsecond of the pulse except at very high frequencies. The intermediate-resolution experiments confirmed the temporal trends yielded by the high-resolution experiments with the rotational and vibrational temperatures rising significantly and abruptly after the early times in a pulse. It was therefore demonstrated that temporal and spatial variations in the plasma must be taken into account to fully characterize the thermal behavior of these actuators. Finally, to begin to characterize the effect of these plasmas on a supersonic flow and boundary layer, a pulsed plasma jet was injected into a Mach 3 cross-flow, and schlieren imaging experiments were conducted, indicating the formation of a weak bow shock propagating into the flow. A disturbance in the boundary layer was observed in these images.
Issue Date:2012-05-22
Rights Information:Copyright 2012 Bradley Sanders
Date Available in IDEALS:2012-05-22
Date Deposited:2012-05

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