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      Fundamental Study of Radio-Frequency Preionization for Seed-Free Magnetohydrodynamic Electrical Power Generation

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          Abstract

          A fundamental study of radio-frequency preionization has been conducted as a preliminary step toward the application in a seed-free magnetohydrodynamic electrical power generator. Argon gas heated and pressured in a shock tunnel facility is accelerated to supersonic speeds in a straight cylindrical duct without applied magnetic field and is ionized by a radio-frequency electromagnetic field with an induction coil. The experimental results show that the discharge changes from E-mode to H-mode via unstable discharge with the increase in radio-frequency input power. This H-mode discharge generates a stable plasma in the supersonic flow. Two-dimensional numerical simulations show that the calculated static pressure and coil current agree with the experimental results. In the supersonic flow, the maximum Joule heating and ionization occur close to the duct wall because of the effect of the velocity boundary layer, and the plasma is almost attached to the wall. Conversely, in the subsonic flow, maximum Joule heating and ionization occur away from the duct wall. The power factor of discharge in the supersonic flow is higher than that of the discharge in the subsonic flow under the same input power conditions.

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          Most cited references19

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          Thin-layer approximation and algebraic model for separated turbulentflows

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            Upwind and symmetric shock-capturing schemes.

            Yee, H. I. Yee (1987)
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              Numerical Study on Feasibility of Pulsed-Heat-Source High-Temperature Inert Gas MHD Electrical Power Generation

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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
                04 May 2017
                January–February 2018
                : 34
                : 1
                : 40-47
                Affiliations
                Tokyo Institute of Technology, Yokohama 226-8502, Japan
                Author notes
                [*]

                Graduate Student, Department of Energy Sciences; tanaka.m.ay@ 123456m.titech.ac.jp . Student Member AIAA.

                [†]

                Graduate Student, Department of Energy Sciences; hitotsubashi.y.aa@ 123456m.titech.ac.jp .

                [‡]

                Professor, Department of Energy Sciences; okuno.y.aa@ 123456m.titech.ac.jp . Member AIAA.

                Article
                B36437 B36437
                10.2514/1.B36437
                5569e441-dbdd-4a3a-ba88-d60687250256
                Copyright © 2017 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved. 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
                : 18 August 2016
                : 21 February 2017
                : 22 February 2017
                Page count
                Figures: 19, Tables: 2
                Categories
                Full-Length Paper

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

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