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Study of Nonequilibrium High-Speed Plasma Flows with a Large Amount of Oxygen Atom

Research Project

Project/Area Number 01550135
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionGunma University

Principal Investigator

SHIRAI Hiroyuki  Gunma Univ. Dept. of Engineering Professor, 工学部, 教授 (00008509)

Co-Investigator(Kenkyū-buntansha) TABEI Katsuine  Gunma Univ. Dept. of Engineering Assistant, 工学部, 助手 (80008466)
Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1990: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1989: ¥1,300,000 (Direct Cost: ¥1,300,000)
KeywordsStrong Shock Wave / Nonequilibrium Plasma / Nonequilibrium Radiation / Nonequilibrium Dissociation Rate / Maecker Type Plasma Generator / Air Plasma / Moire-Schlieren Method / 3D Free Jet / プラズマ発生装置 / 非平衡衝撃層 / モアレ・シュリ-レン法
Research Abstract

(1) Nonequilibrium plasma generator which operates for air, nitrogen or oxygen gas was made for trial. Plasma torch has Cu anode and Hf cathode. The Hf cathode was effective for reducing the damage of the electrode. Preliminary experiments indicate that the core of plasma flows is about 2-6 cm long, and its temperature ranges 4000-9000K, depending on test-chamber pressure. From the results, it was found that the present apparatus was useful for the study of an interaction of material with nonequilibrium plasmas.
(2) Strong air shock waves propagating in a shock tube were investigated numerically, detailed nonequilibrium reactive and radiative processes being included. Gas dynamic behaviors were calculated for shock Mach number above M=20. At M>30, unique radiative property with two peaks in radiative intensity distribution was found, one of which was due to nonequilibrium physico-chemical process and the other due to equilibrium one.
(3) Low-density stagnation-flows in a strong N_2 shock … More layer were studied numerically to examine the effect of physical parameters such as nonequilibrium chemical reaction rates, cross section for vibrational relaxation, and so on. These parameters were found to have large effect on flow properties in the shock layer, but have very minor effect on the convective heat transfer rate to a stagnation point.
(4) Nonequilibrium dissociation reaction rates and effective dissociation energy for O_2, N_2, NO and C_2 were calculated based upon the concept of "effective bond energy". Simple mathematical expressions for the effective dissociation energy are presented.
(5) The Moire-Schlieren method was applied to supersonic free jets to visualize and investigate their structure. Using mathematical transformation method developed by the authors, jet structures from 3D nozzles were clarified.
(6) Nonequilibrium radiation from air plasma was preliminarily investigated by means of the Maecker-type plasma generator. It was found that the plasma temperature was about 6000-10000K, and that N_2 molecular bands predominated for relatively low-temperature region and radiations associated with N and O did for high-temperature zone. Less

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (16 results)

All Other

All Publications (16 results)

  • [Publications] 白井 紘行・田中 敦司: "強い空気衝撃波背後の放射" 衝撃工学シンポジウム論文集. 122-127 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 白井 紘行: "N_2,O_2,NOおよびC_2の非平衡解離速度" AOTV気体力学シンポジウム論文集. 371-380 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K.Tabei and H.Shirai: "Temperature and/or Density Measurements of Asymmetrical Flow Fields by Means of the MoireーSchlieren Method" JSME Int.J. 33. 249-225 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 田部井 勝稲・白井 紘行・高草木 文雄: "モアレシュリ-ンレン法による円形および正方形ノズルからの空気不足膨張流の密度測定" 日本機械学会論文集. 57. (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 白井 紘行: "低密度衝撃波流に対する熱化学的非平衡性の影響" 衝撃波に関するワ-クショップ資料. 15-24 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 白井 紘行・田部井 勝稲: "モアレシュリ-レン法による非対称ノズルからの超音速不足膨張流の測定" AOTVの気体力学発表論文集. 155-158 (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Tabei and H. Shirai: "Temperature and/or Density Measurements of Asymmetrical Flow Fields by Means of the Moire-Schlieren Method" JSME Int. J.Vol. 33, No. 2. 249-255 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] K. Tabei and H. Shirai: "Density Measurements of Underexpanded Freejets of Air from Circular and Square Nozzles by Means of Moire-Schlieren Method" Trans. Jpn. Soc. Mech. Eng.Vol. 57. (1991)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 田部井 勝稲・白井 紘行・高草木 文雄: "モアレシュリ-レン法による円形および正方形ノズルからの空気不足膨張流の密度測定" 日本機械学会論文集(掲載決定). 57. (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 白井 紘行: "低密度衝撃層流に対する熱化学的非平衡性の影響" 衝撃波に関するワ-クショップ資料. 15-24 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 白井 紘行・田部井 勝稲: "モアレシュリ-レン法による非対称ノズルからの超音速不足膨張流の測定" AOTVの気体力学発表論文集. 155-158 (1991)

    • Related Report
      1990 Annual Research Report
  • [Publications] 白井紘行: "強い空気衝撃波背後の放射" 衝撃工学シンポジウム発表論文集. 122-127 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] 白井紘行: "N_2、O_2、NOおよびC_2の非平衡解離速度" AOTV気体力学シンポジウム発表論文集. 371-380 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 田部井勝稲: "Temperature and/or Density Measurements of Asymmetrical Flow Fields by Means of the Moire-Schlieren Method" JSME. (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 田部井勝稲: "モアレシュリ-レン法による不足膨張流の密度測定" 日本機械学会論文集.

    • Related Report
      1989 Annual Research Report
  • [Publications] 白井紘行: "3温度モデルに基づく強い衝撃波背後の放射特性" 日本航空宇宙学会誌.

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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