Abstract
This manuscript presents and discusses the very first successful application of the Femtosecond Laser Electronic Excitation Tagging (FLEET) velocimetry technique in an arc-jet flow. Specifically, one-dimensional, quantitative, FLEET velocimetry data were obtained in the effort to characterize the 1.6 MW ONR-UTA arc-jet plasma wind tunnel, Leste, housed at the Aerodynamics Research Center of the University of Texas at Arlington. While the FLEET technique has been used in other types of high-speed wind tunnel facilities, application to flows with high background radiation, such as arc-jets, has never been demonstrated before this work. The high background emissions posed concerns on the feasibility of performing FLEET velocimetry measurements. However, this work demonstrates how these concerns were addressed and presents the first successful application of the FLEET technique in arc-jet flows. The FLEET emissions in the arc-jet plume were successfully imaged, and a significant spatio-temporal variation in the tag’s displacement was observed. For the selected operational condition in this study, the average measured gas velocity in the arc-jet plume was 1.78 km/s.
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This material is based upon research supported by, or in part by, the U.S. Office of Naval Research under Award Number N00014-19-1-2250. This research used resources of the Princeton Collaborative Low Temperature Plasma Research Facility (PCRF), which is a collaborative research facility supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences under Award Number DE-SC0021154.
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Gopal, V., Palmquist, D., Maddalena, L. et al. FLEET velocimetry measurements in the ONR-UTA arc-jet wind tunnel. Exp Fluids 62, 212 (2021). https://doi.org/10.1007/s00348-021-03306-4
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DOI: https://doi.org/10.1007/s00348-021-03306-4