Temporally and spatially resolved spectroscopic measurements of plasma-actuator thermal properties

Bradley Sanders, Bradley DeBlauw, Gregory Elliott, Craig Dutton, Nick Glumac

Research output: Contribution to journalArticlepeer-review

Abstract

An experiment was conducted to demonstrate temporally and spatially resolved spectroscopic measurements of plasma-actuator thermal properties in the localized arc-filament plasma actuator (LAFPA). The plasma is induced in this device by the generation of a high voltage between the two electrodes; a rapid increase in the electric potential between the electrodes results in the breakdown of the air into the electric-arc plasma as current begins to flow across the gap. In the highest-resolution, temporally resolved experiments, the light emitted by a single LAFPA was imaged using fused silica plano-convex lenses onto the entrance slit of a custom 1.52 mf/12 Czerny-Turner spectrometer. Temperatures observed in the plasma vary significantly over the discharge with rotational temperatures increasing by approximately four times, and vibrational temperatures increasing by 50%. It was found that spatial variation within the plasma is likewise significant, with the emission from the anode being much stronger than that of the cathode or gap region.

Original languageEnglish (US)
Pages (from-to)1802-1806
Number of pages5
JournalAIAA journal
Volume52
Issue number8
DOIs
StatePublished - Aug 2014

ASJC Scopus subject areas

  • Aerospace Engineering

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