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      Electrically Excited, Supersonic Flow Carbon-Monoxide Laser with Air Species in Laser Mixture

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          Abstract

          Performance parameters of an electric discharge excited, supersonic flow CO laser operated with significant amounts of air species in the laser mixture is studied experimentally and by kinetic modeling. The results demonstrate that adding nitrogen to the CO–He mixture increases the laser power significantly, by up to a factor of 3. Adding oxygen reduces CO vibrational excitation and results in a steep laser power reduction. Adding air to the laser mixture also produces higher output power, such that the positive effect of nitrogen outweighs the negative effect of oxygen. This result indicates that a chemical CO laser, not dependent on the electric discharge for excitation, may be capable of operating in a mixture of carbon vapor and air. Performance of a supersonic flow chemical laser excited by a reaction of carbon vapor and molecular oxygen is analyzed by kinetic modeling. Peak laser power is predicted at the C vapor mole fraction of 0.2%, when 15% of energy stored in CO vibrational energy mode (4.5% of the reaction enthalpy) is converted to laser power. At higher C vapor mole fractions, flow temperature rise caused by exothermic reactions and by CO vibrational relaxation results in rapid reduction of the predicted laser power.

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          Most cited references53

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          Solving the Boltzmann equation to obtain electron transport coefficients and rate coefficients for fluid models

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            Kinetic scheme of the non-equilibrium discharge in nitrogen-oxygen mixtures

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              Theory of vibrational energy transfer between simple molecules in nonreactive collisions

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                Author and article information

                Conference
                jpp
                Journal of Propulsion and Power
                J. Propulsion
                American Institute of Aeronautics and Astronautics
                0748-4658
                1533-3876
                27 August 2018
                November–December 2018
                : 34
                : 6
                : 1494-1504
                Affiliations
                Ohio State University , Columbus, Ohio 43210
                Author notes
                [*]

                Graduate Research Associate, Department of Mechanical and Aerospace Engineering. Member AIAA.

                [†]

                Visiting Scholar, Department of Mechanical and Aerospace Engineering.

                [‡]

                Research Scientist, Department of Mechanical and Aerospace Engineering. Member AIAA.

                [§]

                Professor Emeritus, Department of Mechanical and Aerospace Engineering. Fellow AIAA.

                [¶]

                Professor, Department of Mechanical and Aerospace Engineering. Associate Fellow AIAA.

                Article
                B37053 B37053
                10.2514/1.B37053
                ef5f6aaa-ef76-4966-95f5-50d8466b92c3
                Copyright © 2018 by M. Yurkovich, Z. Eckert, E. R. Jans, K. Frederickson, J. W. Rich, and I. V. Adamovich. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the ISSN 0748-4658 (print) or 1533-3876 (online) to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.
                History
                : 14 January 2018
                : 7 May 2018
                : 11 June 2018
                Page count
                Figures: 15, Tables: 2
                Funding
                Funded by: Lockheed Martin Corporation
                Categories
                Full-Length Paper

                Engineering,Physics,Mechanical engineering,Space Physics
                Engineering, Physics, Mechanical engineering, Space Physics

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