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A Study on Spray Combustion in Supercritical Environments

Research Project

Project/Area Number 63460100
Research Category

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

Allocation TypeSingle-year Grants
Research Field Thermal engineering
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

HIROYASU Hiroyuki  Hiroshima Univ., Faculty of Engineering, Professor, 工学部, 教授 (40034326)

Co-Investigator(Kenkyū-buntansha) NISHIDA Keiya  Hiroshima Univ., Faculty of Engineering, Associate Researcher, 工学部, 助手 (90156076)
ARAI Masataka  Hiroshima Univ., Faculty of Engineering, Associate Professor, 工学部, 助教授 (80112176)
Project Period (FY) 1988 – 1989
Project Status Completed (Fiscal Year 1989)
Budget Amount *help
¥7,000,000 (Direct Cost: ¥7,000,000)
Fiscal Year 1989: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1988: ¥6,000,000 (Direct Cost: ¥6,000,000)
KeywordsSpray / Supercritical Condition / Vapor Concentration / Mean Drop Diameter / Fraunhofer Diffraction / Holography / Schlieren / Image Processing / 画像解折 / 高圧燃料 / 不輝炎燃焼 / フランホーヘル回折 / ホログラフィー / シュリーレン
Research Abstract

A basic research was conducted on mechanisms of spray combustion in pressurized and heated ambient gas beyond the critical point of liquid fuel, that is, supercritical environments. The current research includes the following three items : (1) Blue Flame Combustion in a Jet-Mixing-Type Spray Combustor (2) Fuel Vapor Concentration and Mean Drop Diameter in a Spray Injected into Supercritical Environments (3) Drop Evaporation and Combustion in Supercritical Environments on a Hot Wall.
The principal results of the experiments listed above are as follows: (1) Mechanisms of blue flame combustion were investigated by the measurement of temperature distribution in a flame and the sampling analysis of combustion contents in a flame. Oxygen concentration and temperature around a nozzle in blue flame combustion were higher than in yellow flame combustion. Acetylene concentration in a flame showed higher value in a yellow flame. (2) Fuel vapor concentration in a spray injected into supercritical environments was measured by the image processing technique of a reconstructed hologram. The radial distribution of the fuel vapor concentration showed a low value at the center and the edge of the spray, and took a maximum between them. Mean drop diameter of the spray was measured by the optical analysis of the Fraunhofer diffraction light. The mean drop diameter increased once, then decreased with an increase of the ambient temperature. (3) Evaporation and combustion processes of a fuel drop in supercritical environments on a wall were observed in a pressure vessel. The evaporation lifetime in air was found to be shorter than that in nitrogen at the same wall temperature. As the ambient pressure increased beyond the critical pressure of the fuel, the end of combustion time increased in the wall temperature range just below the critical temperature of the fuel, and in the other temperature range it decreased.

Report

(3 results)
  • 1989 Annual Research Report   Final Research Report Summary
  • 1988 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] 田端道彦: "蒸発過程にあるディ-ゼル噴霧の平均粒径(第1報,高温高圧下での平均粒径の計測法)" 日本機械学会論文集(B編). 56-521. 206-213 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 田端道彦: "蒸発過程にあるディ-ゼル噴霧の平均粒径(第2報、高温高圧下での平均粒径の測定結果)" 日本機械学会論文集(B編). 56-521. 214-220 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 西田恵哉: "画像解析による噴霧内燃料濃度の測定法" 日本機械学会第67期全国大会講演回講演概要集. No.890-50. 279-280 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Hiroyuki Hiroyasu: "Drop Evaporation and Combustion in Supercritical Environments on a Hot Wall" Proceedings of 3rd ASME-JSME Thermal Engineering Joint Conference(March.17-22,1991,Reno,Nevada,USA). (1991)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Michihiko Tabata: "Mean Drop Diameter of a Diesel Spray in a Vaporizing Process (1st Report, Method for Measuring the Drop Size of a Spray Injected into an Elevated Temperature and Pressure Environment)" Transactions of the Japan Society of Mechanical Engineers, 56-521, 206-213, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Michihiko Tabata: "Mean Drop Diameter of a Diesel Spray in a Vaporizing Process (2nd Report, Results at an Elevated Temperature and Pressure Environment)" Transactions of the Japan Society of Mechanical Engineers, 56-521, 214-220, 1990.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Keiya Nishida: "Image Processing Technique for Measuring Fuel Concentration in a Spray" Reprint of the Japan Society of Mechanical Engineers, No.890-50, 279-280, 1989.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] Hiroyuki Hiroyasu: "Drop Evaporation and Combustion in Supercritical Environments on a Hot Wall" Proceedings of 3rd ASME-JSME Thermal Engineering Joint Conference (March 17-22, 1991, Reno, Nevada, USA), 1991.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1989 Final Research Report Summary
  • [Publications] 田端道彦: "蒸発過程にあるディ-ゼル噴霧の平均粒径(第1報、高温高圧下での平均粒径の計測法)" 日本機械学会論文集(B編). 56ー521. 206-213 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 田端道彦: "蒸発過程にあるディ-ゼル噴霧の平均粒径(第2報、高温高圧下での平均粒径の測定結果)" 日本機械学会論文集(B編). 56ー521. 214-220 (1990)

    • Related Report
      1989 Annual Research Report
  • [Publications] 西田恵哉: "画像解析による噴霧内燃料濃度の測定法" 日本機械学会第67期全国大会講演会講演概要集. No.890ー50. 279-280 (1989)

    • Related Report
      1989 Annual Research Report
  • [Publications] Hiroyuki Hiroyasu: "Drop Evaporation and Combustion in Supercritical Environments on a Hot Wall" Proceedings of 3rd ASME-JSME Thermal Engineering Joint Conference(March 17-22,1991 Reno,Nevada,USA). (1991)

    • Related Report
      1989 Annual Research Report
  • [Publications] Keiya NISHIDA;Hiroyuki HIROYASU: Proceedings of the First KSME-JSME Thermal and Fluids Engineering Conference,Volume 1. 1-423-1-428 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 廣安博之,田端道彦,藤井宏,新井雅隆: 第7回内燃機関合同シンポジウム講演論文集. 73-78 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 藤井宏,田端道彦,新井雅隆,廣安博之: 第7回内燃機関合同シンポジウム講演論文集. 79-84 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 田端道彦,新井雅隆,廣安博之: 第7回内燃機関合同シンポジウム講演論文集. 49-54 (1988)

    • Related Report
      1988 Annual Research Report
  • [Publications] 中曽伸二,新井雅隆,廣安博之: 第26回燃焼シンポジウム前刷集. 389-391 (1988)

    • Related Report
      1988 Annual Research Report

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Published: 1988-04-01   Modified: 2016-04-21  

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