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Elucidation of propagation mechanism for gas droplet two phase detonation: estimation based on characteristic lengths and systematic organization of propagation characteristics

Research Project

Project/Area Number 20K22391
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionNagoya University

Principal Investigator

Watanabe Hiroaki  名古屋大学, 工学研究科, 助教 (20881238)

Project Period (FY) 2020-09-11 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Keywordsデトネーション / 気液二相デトネーション / 液滴分裂 / 伝播特性 / 特性長 / 液滴挙動 / 分裂
Outline of Research at the Start

数km毎秒という高速で伝播する燃焼現象であるデトネーションは高性能な次世代エンジンへの応用が期待される.しかし,その実用化のための課題である液体燃料または液体酸化剤の使用には気相と液相を含む気液二相デトネーションに対する知見が必須となる.本研究では実験と数値解析の多角的なアプローチを用いて気液二相デトネーションがどのように伝播を継続するかそのメカニズムの解明を行う.また,デトネーションと液滴のパラメータを基にエンジンの設計で必要となる気液二相デトネーションの特性に関する整理を行う.

Outline of Final Research Achievements

Two-dimensional numerical simulations based on Eulerian-Lagrangian method which can produce the behavior of droplets are conducted on gaseous detonation with water droplets with initial diameter distribution to analyze the behavior of detonation propagation and droplets. The main factors to cause the droplet breakup are the transverse wave and the jets regardless of the initial droplet diameter, and the contribution of two factors is affected by the initial droplet diameter. Also, the droplet diameter after the breakup is not uniform depending on the initial droplet diameter, and the accuracy of the prediction of the breakup time and the droplet diameter after the breakup can be enhanced using the average dynamic pressure between the front and the position where the breakup ends. Furthermore, the gaseous detonation with water sprays shows the similar structure to that without water spray from the comparison of characteristic lengths for the gas and droplets in the present conditions.

Academic Significance and Societal Importance of the Research Achievements

本研究の成果により,液滴を含むデトネーションにおいて液滴の分裂が生じる物理機構の理解をより深化させた.そして,液滴の分裂時間や分裂後の液滴直径の予測精度を向上させる本研究の手法は,水液滴を用いたデトネーションの消炎及び被害低減手法の最適化に役立つと考えられる.また,本条件において液滴を含むデトネーションは気相デトネーションと類似した伝播特性を示す事を把握した事は,水液滴を用いたデトネーションの消炎及び被害低減手法に対するモデル化の糸口となる.さらに,本研究で得た知見はデトネーションを用いた高熱効率次世代燃焼器の実用化に向けた課題である液体燃料の使用の解決する事に貢献できる.

Report

(3 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • Research Products

    (13 results)

All 2021 2020 Other

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (10 results) (of which Int'l Joint Research: 6 results,  Invited: 1 results) Remarks (2 results)

  • [Journal Article] Numerical analysis on behavior of dilute water droplets in detonation2021

    • Author(s)
      Watanabe Hiroaki、Matsuo Akiko、Chinnayya Ashwin、Matsuoka Ken、Kawasaki Akira、Kasahara Jiro
    • Journal Title

      Proceedings of the Combustion Institute

      Volume: 38 Issue: 3 Pages: 3709-3716

    • DOI

      10.1016/j.proci.2020.07.141

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Presentation] Flight Demonstration of Detonation Engine System Using Sounding Rocket S-520-31: Flight Path and Attitude2021

    • Author(s)
      Hiroaki Watanabe, Koichi Matsuyama, Ken Matsuoka, Akira Kawasaki, Noboru Itouyama, Keisuke Goto, Kazuki Ishihara, Valentin Buyakofu, Tomoyuki Noda, Shiro Ito, Jiro Kasahara, Akiko Matsuo, Ikkoh Funak et al.
    • Organizer
      AIAA Scitech Forum and Exposition 2022
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] In-Space Flight Demonstration Results of a Detonation Engine System on Sounding Rocket S-520-31: Flight Path and Attitude2021

    • Author(s)
      Hiroaki Watanabe, Koichi Matsuyama, Ken Matsuoka, Akira Kawasaki, Noboru Itouyama, Keisuke Goto, Kazuki Ishihara, Valentin Buyakofu, Tomoyuki Noda, Shiro Ito, Jiro Kasahara, Akiko Matsuo, Ikkoh Funaki et al.
    • Organizer
      33rd International Symposium on Space Technology and Science
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Numerical analysis on the breakup of dilute water spray in gaseous detonation2021

    • Author(s)
      Hiroaki Watanabe, Akiko Matsuo, Ashwin Chinnayya, Ken Matsuoka, Akira Kawasaki, Jiro Kasahara
    • Organizer
      28th International Colloquium on the Dynamics of Explosions and Reactive Systems
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] The comparison of Favre average procedure for the gaseous detonation from Eulerian and Lagrangian point of view2021

    • Author(s)
      Hiroaki Watanabe, Akiko Matsuo, Ashwin Chinnayya, Noboru Itouyama, Akira Kawasaki, Ken Matsuoka, Jiro Kasahara
    • Organizer
      28th International Colloquium on the Dynamics of Explosions and Reactive Systems
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 粒子追跡法を用いた気相デトネーションの平均構造に関する数値解析2021

    • Author(s)
      渡部広吾輝,松尾亜紀子,Ashwin Chinnayya,伊東山登,川﨑央,松岡健,笠原次郎
    • Organizer
      2021年度衝撃波シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] Mean structure and droplet behavior in gaseous detonation with dilute water spray2021

    • Author(s)
      Hiroaki Watanabe, Akiko Matsuo, Ashwin Chinnayya, Ken Matsuoka, Akira Kawasaki, Jiro Kasahara
    • Organizer
      Young researchers’ forum on detonation: from fundamentals to application
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Numerical analysis on behavior of dilute water droplets in detonation2020

    • Author(s)
      Hiroaki Watanabe, Akiko Matsuo, Ashwin Chinnayya, Ken Matsuoka, Akira Kawasaki, Jiro Kasahara
    • Organizer
      38th International Symposium on Combustion
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] 初期直径分布を有する希薄な水液滴群を含む混合気中を伝播する気相デトネーションに関する数値解析2020

    • Author(s)
      渡部広吾輝,松尾亜紀子,Ashwin Chinnayya, 松岡健,川﨑央,笠原次郎
    • Organizer
      日本機械学会2020年度年次大会
    • Related Report
      2020 Research-status Report
  • [Presentation] 初期直径分布を有する希薄な水液滴群を含む気相デトネーションの平均構造と液滴挙動に関する数値解析2020

    • Author(s)
      渡部広吾輝,松尾亜紀子,Ashwin Chinnayya, 松岡健,川﨑央,笠原次郎
    • Organizer
      第58回燃焼シンポジウム
    • Related Report
      2020 Research-status Report
  • [Presentation] S-520-31号機によるデトネーション実験の進捗状況:飛行経路および姿勢予測2020

    • Author(s)
      渡部広吾輝,伊藤志朗,伊東山登,川﨑央,松岡健,松山行一,笠原次郎,松尾亜紀子,船木一幸,竹内伸介,岩崎祥大,和田明哲,増田純一,荒川聡,羽生宏人,山田和彦
    • Organizer
      令和2年度宇宙輸送シンポジウム
    • Related Report
      2020 Research-status Report
  • [Remarks] Research map

    • URL

      https://researchmap.jp/hiroaki.watanabe

    • Related Report
      2021 Annual Research Report
  • [Remarks] 申請者 個人業績

    • URL

      http://www.prop.nuae.nagoya-u.ac.jp/member87.html

    • Related Report
      2020 Research-status Report

URL: 

Published: 2020-09-29   Modified: 2023-01-30  

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