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2002 Fiscal Year Final Research Report Summary

Plasma Flow Structure of Direct-Current Arcjet Thrusters and Its Spacecraft Interaction Research

Research Project

Project/Area Number 13450398
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Aerospace engineering
Research InstitutionOsaka University

Principal Investigator

TAHARA Hirokazu  Osaka University, Graduate School of Engineering Science, Associate Professor, 大学院・基礎工学研究科, 助教授 (20207210)

Co-Investigator(Kenkyū-buntansha) ONOE Ken-ichi  Osaka University, Graduate School of Engineering Science, Assistant Professor, 大学院・基礎工学研究科, 助手 (70029429)
YOSHIKAWA Takao  Osaka University, Graduate School of Engineering Science, Professor, 大学院・基礎工学研究科, 教授 (00029498)
Project Period (FY) 2001 – 2002
KeywordsArcjet Thruster / Space Propulsion / Electric Propulsion / Plasma Flow / Plasma Environment / Spacecraft Environment / Contamination / Plasma Diagnostics
Research Abstract

Spectroscopic and electrostatic probe measurements were made to examine plasma characteristics with or without a titanium plate for a 10-kW-class direct-current arcjet thruster. Heat fluxes into the plate from the plasma were also evaluated with a Nickel slug and thermocouple arrangement. Ammonia and mixtures of nitrogen and hydrogen were used as a working gas. The NH_3 and N\2+3H_2 plasmas in the nozzle and in the downstream plume without a substrate plate were in thermodynamical nonequilibrium states. As a result, the H-atom electronic excitation temperature and the N_2 molecule-rotational excitation temperature intensively decreased downstream in the nozzle although the NH molecule-rotational excitation temperature did not show an axial decrease. Each temperature was kept in a small range in the plume without a substrate plate except for the NH rotational temperature for NH_3 working gas. On the other hand, as approaching the titanium plate, the thermodynamical nonequilibrium plasma came to be a temperature-equilibrium one because the plasma flow tended to stagnate in front of the plate. The electron temperature had a small radial variation near the plate. Both the electron number density and the heat flux decreased radially outward, and an increase in H_2 mole fraction raised them at a constant radial position. In cases with NH_3 and N_2+3H_2, a radical of NH with a radially wide distribution was considered to contribute to the better nitriding as a chemically active and non heating process.

  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Hirokazu Tahara et al.: "Near Substrate Plasma Characteristics of a Supersonic Ammonia and Nitrogen/Hydrogen-Mixture DC Plasma Jet for Nitriding under a Low Pressure Environment"Proc. 15th Int. Symp. Plasma Chemistry. 1. 205-210 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tsuji Shibata et al.: "Plasma Flow Characteristics of Electromagnetic Acceleration Plasma Jet Generator for Titanium-Nitride Reactive Spray Coatings"Proc. 15th Int. Symp. Plasma Chemistry. 6. 2219-2224 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirokazu Tahara et al.: "Plasma Plume Characteristics of a Supersonic Ammonia and Nitrogen/Hydrogen-Mixture DC Plasma Jet for Nitriding under a Low Pressure Environment"Advances in Applied Plasma Science. 3. 35-40 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirokazu Tahara et al.: "Exhaust Plume Characteristics of Quasr Steady MPD Thrusters"27th Int. Electric Propulsion Conf. 1. 1-9 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 白崎 篤司 他: "基板に衝突する希薄流のモンテカルロシミュレーション"プラズマ応用科学. 9. 9-16 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirokazu Tahara et al.: "Plasma Characteristics of a 10-kw-Class DC Arcjet"Proc. 23rd Int. Symp. Space Tech. and Sci.. 2002-b-35p. 407-412 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirokazu Tahara et al.: "Near-Substrate Plasma Characteristics and Relationships between Heat Fluxes of DC Plasma Jet and Them"Proc. Int. Thermal Spray Conf.. 1. 771-776 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirokazu Tahara et al.: "Plasma and Heat Flux Characteristics of a Supersonic Ammonia or Nitrogen/Hydrogen-Mixture DC Plasma Jet"IEEE Trans. Plasma Science. 4(印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirokazu Tahara et al.: "Material Spraying Llsiing Electromagnetically Accelerated Plasma"Japanese Journal of Appl.Phys.. 4(印刷中). (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hirokazu Tahara et al.: "Near-Substrate Plasma Characteristics of a Supersonic Ammonia and Nitrogen/Hydrogen-Mixture DC Plasma Jet for Nitriding under a Low Pressure Environment"Proc. 15th Int. Symp. Plasma Chemistry. Vol.1. 205-2l0 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] TeTsuji Shibata et al.: "Plasma Flow Characteristics of Electromagnetic Acceleration Plasma Jet Generator for Titanium-Nitride Reactive Spray Coatings"Proc. 15th Int. Symp. Plasma Chemistry. Vol.1. 205-210 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirokazu Tahara et al.: "Plasma Plume Characteristics of a Supersonic Ammonia and Nitrogen/Hydrogen-Mixture DC Plasma jet Generator for Nitriding under a Low Pressure Environment"Advances in Appl. Plasma Sci.. Vol.3. 35-40 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirokazu Tahara et al.: "Exhaust Plume Characteristics of Quasi-Steady MPD Thrusters"27th Int. Electric Propulsion Conf.. 1-9 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirokazu Tahara et al.: "Plasma Characteristics of a 10-kW-Class DC Arcjet"Proc. 23rd Int. Symp. Space Tech. and Sci.. 2002-b-35p. 407-412 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirokazu Tahara et al.: "Near-Substrate Plasma Characteristics And Relationships between Heat Fluxes of DC Plasma Jet and Them"Proc. Int. Thermal Spray Conf.. Vol.1. 771-776 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirokazu Tahara et al.: "Plasma and Heat Fluxes Characteristics of a Supersonic Ammonia or Nitrogen-Mixture DC Plasma Jet"IEEE Trans. Plasma, Sci.. in press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hirokazu Tahara et al.: "Material Spraying Using Electromagnetically Accelerated Plasma"Jpn. J. Appl. Phys.. in press. (2002)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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