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Study of direct ignition method for fuel spray using laser-induced breakdown plasma

Research Project

Project/Area Number 17K06197
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Thermal engineering
Research InstitutionYamaguchi University

Principal Investigator

Takehiko Seo  山口大学, 大学院創成科学研究科, 准教授 (00432526)

Project Period (FY) 2017-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords熱工学 / 燃焼 / プラズマ利用 / 着火 / 噴霧燃焼 / レーザー / 燃料噴霧
Outline of Final Research Achievements

In order to reliably ignite the fuel spray using laser beam, it is necessary to clarify the ignition mechanism in the fuel spray. In this study, we considered that the fuel droplet size and density of the fuel droplets around the ignition position and the behavior of the droplets affect the propriety of ignition. As a result, the effects of fuel droplet size and density on the success or failure of ignition could not be confirmed. It is known that a donut-shaped high temperature area is formed in laser-induced breakdown ignition, but ignition tends to fail when such a flow occurs. It was found that this flow needs to be actively controlled when the spray is ignited.

Academic Significance and Societal Importance of the Research Achievements

レーザー点火は空間中で集光させプラズマを生成させ点火させる方法であるが,比較的大きなエネルギーが必要になる短所がある.燃料噴霧をターゲットとした場合には,そのエネルギーを下げることができる.今回,点火位置における流れが点火の可能性に影響を及ぼしていることが分かった.この流れは燃料液滴とレーザー光の干渉によって生じるものである.今後は燃料液滴との干渉効果を調査し,これをコントロールすることで確実に点火できる点火システムが構築できると考える.

Report

(6 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (5 results)

All 2022 2020 2019 2017

All Journal Article (1 results) (of which Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] A Study of Laser-induced Breakdown Ignition in Fuel Spray (2<sup>nd</sup> Report: Investigation of Laser-induced Breakdown and Ignition Characteristics in Fuel Spray Flow)2019

    • Author(s)
      瀬尾 健彦、石村 祐宜、三上 真人
    • Journal Title

      Journal of the Combustion Society of Japan

      Volume: 61 Issue: 196 Pages: 142-148

    • DOI

      10.20619/jcombsj.1805

    • NAID

      130007649850

    • ISSN
      1347-1864, 2424-1687
    • Related Report
      2019 Research-status Report 2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 低圧雰囲気下でのレーザーによる噴霧着火に関する調査:画像解析による粒度分布の測定2022

    • Author(s)
      年岡 沙英, 瀬尾 健彦, 三上 真人
    • Organizer
      日本機械学会 中国四国学生会 第52回学生員卒業研究発表講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] A study of the flame kernel formation by laser-induced breakdown ignition in ethanol spray2020

    • Author(s)
      Yushi Saiki, Takehiko Seo and Masato Mikami
    • Organizer
      JCREN2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 燃料噴霧のレーザー着火における初期火炎核形成時の燃料液滴の挙動2020

    • Author(s)
      齊木 勇志,瀬尾 健彦,三上 真人
    • Organizer
      第58回燃焼シンポジウム
    • Related Report
      2020 Research-status Report
  • [Presentation] 噴霧特性が燃料噴霧中のレーザー励起ブレイクダウン着火の着火可否に及ぼす影響2017

    • Author(s)
      立石寛達,瀬尾健彦,三上真人
    • Organizer
      第26回微粒化シンポジウム
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2023-01-30  

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