Deep understanding of elementary processes through microgravity science and application to dispersed phase combustion physics for aero engine

• Project/Area Number: 18H01625
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: Yamaguchi University
• Principal Investigator: Mikami Masato 山口大学, 大学院創成科学研究科, 教授 (20274178)
• Co-Investigator(Kenkyū-buntansha): 瀬尾 健彦 山口大学, 大学院創成科学研究科, 准教授 (00432526)
• Project Period (FY): 2018-04-01 – 2021-03-31
• Project Status: Completed (Fiscal Year 2020)
• Budget Amount: ¥16,640,000 (Direct Cost: ¥12,800,000、Indirect Cost: ¥3,840,000); Fiscal Year 2020: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000); Fiscal Year 2019: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000); Fiscal Year 2018: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
• Keywords: 燃焼 / 液滴群 / 燃え広がり / 微小重力場 / 液滴群燃焼 / 微小重力 / 液体燃料

Outline of Final Research Achievements

The objective of this research is to study the role of cool flame in the flame spread over droplets. The cool flame would be important in the phenomena near the group-combustion-excitation limit observed in the space-based experiments conducted our research group. We further investigated the results of flame spread over randomly distributed droplet clouds in the space-based experiments and analyzed the anomalous combustion phenomena in detail. The results for the droplet-cluster array was also investigated. They suggest that the cool flame appears in the anomalous combustion phenomena. Furthermore, we conducted flame-spread experiments in a drop facility and measured temperature around the droplet existing outside the flame-spread limit using the TFP method using a near-infrared camera. They showed that the cool flame appears in the flame spread within a narrow range of the droplet-spacing condition.

Academic Significance and Societal Importance of the Research Achievements

学術的には，微小重力場での液滴燃焼から，液滴間燃え広がりを通して，ランダム分散液滴群の燃え広がりへつなげ，最終的に噴霧燃焼へと繋げるという意義がある．特に冷炎を考慮した燃え広がり過程の理解は，複雑な反応モデルの簡略化への貢献を通して，冷炎簡略反応モデルを実装した大規模噴霧燃焼の計算コードの産業界への提供へと繋がる社会的意義がある．

Research Products

• [Int'l Joint Research] NASA Glenn Research Center/Case Western Reserve University/University of California, San Diego(米国)
• [Int'l Joint Research] Sebelas Maret University(インドネシア)
• [Int'l Joint Research] NASA Glenn Research Center/Case Western Reserve University/University of California, San Diego(米国)
• [Int'l Joint Research] Sebelas Maret Universitry(インドネシア)
• [Int'l Joint Research] Sebelas Maret Universitry(インドネシア)
• [Int'l Joint Research] NASA Glenn Research Center/Case Western Reserve University/University of California, San Diego(米国)
• [Journal Article] Space-based microgravity experiments on flame spread over randomly distributed n-decane-droplet clouds: Anomalous behavior in flame spread (2021)
  • Author(s): Mikami Masato、Matsumoto Kodai、Yoshida Yasuko、Kikuchi Masao、Dietrich Daniel L.
  • Journal Title: Proceedings of the Combustion Institute Volume: 38 Issue: 2 Pages: 3167-3174
  • DOI: 10.1016/j.proci.2020.07.139
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Study on the appearance of cool flame in flame spread over fuel droplets at high pressure in microgravity (2020)
  • Author(s): Yuto CHIKAMI, Kodai MATSUMOTO, Takehiko SEO, Masato MIKAMI
  • Journal Title: Proceedings of The 21st Annual Conference on Liquid Atomization and Spray Systems - Asia Volume: -
  • Peer Reviewed
• [Journal Article] Temperature-Field Analysis of Flame Spread over Droplet-Cloud Elements with Interactive Droplets in Microgravity aboard Kibo on ISS (2019)
  • Author(s): Yasuko YOSHIDA, Takehiko SEO, Masato MIKAMI, Masao KIKUCHI
  • Journal Title: International journal of microgravity science and application Volume: 36 Issue: 3 Pages: 360303
  • DOI: 10.15011//jasma.36.360303
  • NAID: 130007685879
  • ISSN: 2188-9783
  • Peer Reviewed / Open Access
• [Journal Article] Recent Accomplishment of “Group Combustion” Experiments aboard Kibo on ISS (2019)
  • Author(s): Masato MIKAMI, Yasuko YOSHIDA, Takehiko SEO, Osamu MORIUE, Tetsuya SAKASHITA, Masao KIKUCHI, Yuji KAN
  • Journal Title: International journal of microgravity science and application Volume: 36 Issue: 3 Pages: 360301
  • DOI: 10.15011//jasma.36.360301
  • NAID: 130007685902
  • ISSN: 2188-9783
  • Peer Reviewed / Open Access
• [Journal Article] Droplet-Cloud-Combustion Experiments “Group Combustion” aboard Kibo on the ISS (2019)
  • Author(s): MIKAMI, Masato
  • Journal Title: Proceedings of the 20th Annual Conference on Liquid Atomization and Spray Systems - Asia Volume: -
  • Peer Reviewed
• [Journal Article] Study on large-scale ignition in flame spread of randomly distributed droplet cloud near group-combustion-excitation limit in microgravity (2019)
  • Author(s): Matsumoto, K, Yoshida, Y, Mikami, M, Kikuchi, M
  • Journal Title: Proceedings of 29th European Conference on Liquid Atomization and Spray Systems Volume: - Pages: 247373-247373
  • Peer Reviewed
• [Journal Article] Anomalous Behavior in Flame Spread over Randomly Distributed Droplet Clouds in Microgravity aboard Kibo on the ISS (2019)
  • Author(s): Mikami, M, Yoshida, Y, Kikuchi, M, Dietrich, D.L
  • Journal Title: Proceedings of 12th Asia-Pacific Conference on Combustion Volume: -
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Study on Flame Spread Behavior in Two-dimensional and Three-dimensional Droplet Clouds Considering Flame-spread limit Based on Microgravity Experiments of Flame Spread of Droplet Arrays (2019)
  • Author(s): Saputro, H, Mikami, M, Seo, T
  • Journal Title: Proceedings of 12th Asia-Pacific Conference on Combustion Volume: -
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Flame-spread limit from interactive burning droplets in microgravity (2019)
  • Author(s): Yasuko Yoshida, Kentaro Iwai, Kentaro Nagata, Takehiko Seo, Masato Mikami, Osamu Moriue, Tetsuya Sakashita, Masao Kikuchi, Takuma Suzuki, Masaki Nokura
  • Journal Title: Proceedings of the Combustion Institute Volume: 37 Issue: 3 Pages: 3409-3416
  • DOI: 10.1016/j.proci.2018.07.106
  • Peer Reviewed
• [Journal Article] Analysis of Local Flame-Spread Characteristics of an Unevenly Arranged Droplet Cloud in Microgravity (2018)
  • Author(s): Yasuko YOSHIDA, Narita SANO, Takehiko SEO, Masato MIKAMI, Osamu MORIUE, Yuji KAN, Masao KIKUCHI
  • Journal Title: International journal of microgravity science and application Volume: 35 Issue: 2 Pages: 350203
  • DOI: 10.15011//jasma.35.350203
  • NAID: 130007842582
  • ISSN: 2188-9783
  • Year and Date: 2018-04-30
  • Peer Reviewed / Open Access
• [Journal Article] Generation of a Large-Scale n-Decane-Droplet Cloud Considering Droplet Pre-Vaporization in “Group Combustion” Experiments aboard Kibo/ISS (2018)
  • Author(s): Masato Mikami, Hiroshi Nomura, Yusuke Suganuma, Masao Kikuchi, Masaki Nokura, Takuma Suzuki
  • Journal Title: International journal of microgravity science and application Volume: 35 Issue: 2 Pages: 350202
  • DOI: 10.15011//jasma.35.350202
  • NAID: 130007842581
  • ISSN: 2188-9783
  • Year and Date: 2018-04-30
  • Peer Reviewed / Open Access
• [Journal Article] Flame Spread between Two Droplets of Different Diameter in Microgravity (2018)
  • Author(s): Masato MIKAMI, Naoya MOTOMATSU, Kentaro NAGATA, Yasuko YOSHIDA, Takehiko SEO
  • Journal Title: Combust. Flame Volume: 193 Pages: 76-82
  • DOI: 10.1016/j.combustflame.2018.03.004
  • Peer Reviewed
• [Journal Article] Flame Spread and Group Combustion Excitation in Randomly Distributed Droplets with Low-volatility Fuel near the Excitation Limit: A Percolation Approach Based on Flame-spread Characteristics in Microgravity (2018)
  • Author(s): Masato MIKAMI, Herman SAPUTRO, Takehiko SEO, Hiroshi OYAGI
  • Journal Title: Microgravity Science and Technology Volume: 30 Issue: 4 Pages: 1-15
  • DOI: 10.1007/s12217-018-9603-z
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Space-Based Microgravity Experiments on Flame Spread over Randomly Distributed n-Decane-Droplet Clouds: Overall Flame-Spread Characteristics (2018)
  • Author(s): Masato Mikami, Yasuko Yoshida, Takehiko Seo, Tetsuya Sakashita, Masao Kikuchi, Takuma Suzuki, Masaki Nokura
  • Journal Title: Microgravity Science and Technology Volume: 30 Issue: 4 Pages: 535-542
  • DOI: 10.1007/s12217-018-9637-2
  • Peer Reviewed
• [Journal Article] Flame-Spread Characteristics of Droplet-Cloud Element with Two-Droplet Interaction at High Pressure in Microgravity (2018)
  • Author(s): Kentaro IWAI, Yasuko YOSHIDA, Naoya MOTOMATSU, Takehiko SEO, Masato MIKAMI
  • Journal Title: TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, AEROSPACE TECHNOLOGY JAPAN Volume: 16 Issue: 6 Pages: 494-499
  • DOI: 10.2322/tastj.16.494
  • NAID: 130007481363
  • ISSN: 1884-0485
  • Peer Reviewed
• [Journal Article] A Study of Flame Spread of n-Decane Droplet Arrays with Fuel-vapor Jet at High Pressures in Microgravity (2018)
  • Author(s): Ryo Uneyama, Kentaro Iwai, Kentaro Nagata, Yasuko Yoshida, Takehiko Seo, Masato Mikami
  • Journal Title: Proceedings of The 7th Joint Conference on Renewable Energy and Nanotechnology Volume: －
  • Peer Reviewed
• [Presentation] 液滴干渉を考慮したパーコレーションモデルを用いたランダム分散液滴群の群燃焼発現に関する研究 (2021)
  • Author(s): 原侑花, 千頭勇斗, 松本昂大, 瀬尾健彦, 三上真人
  • Organizer: 日本機械学会中国四国学生会第51回学生員卒業研究発表講演会
• [Presentation] Space-based microgravity experiments on flame spread over randomly distributed n-decane-droplet clouds: Anomalous behavior in flame spread (2021)
  • Author(s): Mikami, M, Matsumoto, K, Yoshida, Y, Kikuchi, M, Dietrich, D.L.
  • Organizer: 38th International Symposium on Combustion
  • Int'l Joint Research
• [Presentation] “Group Combustion” - The First Combustion Experiment aboard Kibo on the ISS - (2021)
  • Author(s): Masato Mikami
  • Organizer: Hypergravity/Microgravity Webinar Series, UNITED NATIONS Office for Outer Space Affairs
  • Int'l Joint Research
• [Presentation] 微小重力場での正デカン液滴間燃え広がりにおける干渉２液滴の二段着火に関する研究 (2020)
  • Author(s): 千頭勇斗, 松本昂大, 瀬尾健彦, 三上真人
  • Organizer: 第58回燃焼シンポジウム
• [Presentation] 微小重力場大気圧雰囲気での液滴群要素の燃え広がりにおける冷炎発生の調査 (2020)
  • Author(s): 松本昂大, 千頭勇斗, 瀬尾健彦, 三上真人
  • Organizer: 日本マイクログラビティ応用学会 第32回学術講演会
• [Presentation] 微小重力場を利用した異なる雰囲気圧力での正デカン液滴間燃え広がりにおける冷炎発生の調査 (2020)
  • Author(s): 千頭勇斗, 松本昂大, 瀬尾健彦, 三上真人
  • Organizer: 日本マイクログラビティ応用学会 第32回学術講演会
• [Presentation] Group Combustion-2，－液滴群燃え広がりにおける冷炎発生調査－，準備状況報告 (2020)
  • Author(s): 三上真人, 野村浩司, 菅沼祐介, 渡邊裕章, 瀬尾健彦, Daniel L. Dietrich, Vedha Nayagam, Forman A. Williams, 齋藤哲平, 大谷健一, 菅 勇志, 菊池政雄
  • Organizer: 日本マイクログラビティ応用学会 第32回学術講演会
• [Presentation] Study on the appearance of cool flame in flame spread over fuel droplets at high pressure in microgravity (2020)
  • Author(s): Yuto CHIKAMI, Kodai MATSUMOTO, Takehiko SEO, Masato MIKAMI
  • Organizer: The 21st Annual Conference on Liquid Atomization and Spray Systems - Asia
  • Int'l Joint Research
• [Presentation] 高圧環境下での液滴の燃え広がりにおける冷炎発生に関する研究 (2020)
  • Author(s): 千頭勇斗, 宇根山凌, 吉田泰子, 瀬尾健彦, 三上真人
  • Organizer: 日本機械学会 中国四国学生会 第50回学生員卒業研究発表講演会
• [Presentation] Droplet-Cloud-Combustion Experiments “Group Combustion” aboard Kibo on the ISS (2019)
  • Author(s): Mikami, M.
  • Organizer: The 20th Annual Conference on Liquid Atomization and Spray Systems - Asia
  • Int'l Joint Research / Invited
• [Presentation] 微小重力場におけるランダム分散液滴群の燃え広がりにおける複雑性に関する一考察 (2019)
  • Author(s): 吉田 泰子, 瀬尾 健彦, 三上 真人, 菊池 政雄
  • Organizer: 第57回燃焼シンポジウム
• [Presentation] マランゴニ対流による燃料蒸気の3次元吹き出し挙動が液滴間燃え広がりに与える影響の調査 (2019)
  • Author(s): 宇根山 凌, 三上 真人
  • Organizer: 第57回燃焼シンポジウム
• [Presentation] ISS「きぼう」での宇宙燃焼実験「Group Combustion」 (2019)
  • Author(s): 三上真人
  • Organizer: 第57回燃焼シンポジウム
  • Invited
• [Presentation] Droplet Cloud Combustion Experiments "Group Combustion" aboard Kibo/ISS (2019)
  • Author(s): Mikami, M.
  • Organizer: Interdisciplinary Seminar at Shanghai Jiao Tong University
  • Invited
• [Presentation] Droplet Cloud Combustion Experiments "Group Combustion" aboard Kibo/ISS (2019)
  • Author(s): Mikami, M.
  • Organizer: China National Symposium on Combustion
  • Invited
• [Presentation] ランダム分散液滴群の燃え広がりにおける特異燃焼挙動と液滴クラスター列を用いた仮説検証 ～ISS「きぼう」における「Group Combustion」実験結果～ (2019)
  • Author(s): 三上真人, 松本昂大, 吉田泰子, 菊池政雄, Daniel L. Dietrich
  • Organizer: 日本マイクログラビティ応用学会第31回学術講演会
• [Presentation] Generation of a Large-Scale n-Decane-Droplet Cloud Considering Droplet Pre-Vaporization in “Group Combustion” Experiments aboard Kibo/ISS (2019)
  • Author(s): 三上真人
  • Organizer: 日本マイクログラビティ応用学会第31回学術講演会
  • Invited
• [Presentation] Study on large-scale ignition in flame spread of randomly distributed droplet cloud near group-combustion-excitation limit in microgravity (2019)
  • Author(s): Matsumoto, K, Yoshida, Y, Mikami, M, Kikuchi, M
  • Organizer: 29th European Conference on Liquid Atomization and Spray Systems
• [Presentation] “Group Combustion” - The First Combustion Experiment aboard Kibo/ISS - (2019)
  • Author(s): Masato Mikami, Takehiko Seo, Yasuko Yoshida, Hiroshi Nomura, Yusuke Suganuma, Tetsuya Sakashita, Masao Kikuchi, Yuji Kan, Daniel L. Dietrich
  • Organizer: ISS R&D conference 2019
  • Int'l Joint Research
• [Presentation] Anomalous Behavior in Flame Spread over Randomly Distributed Droplet Clouds in Microgravity aboard Kibo on the ISS (2019)
  • Author(s): Mikami, M, Yoshida, Y, Kikuchi, M, Dietrich, D.L
  • Organizer: 12th Asia-Pacific Conference on Combustion
  • Int'l Joint Research
• [Presentation] Study on Flame Spread Behavior in Two-dimensional and Three-dimensional Droplet Clouds Considering Flame-spread limit Based on Microgravity Experiments of Flame Spread of Droplet Arrays (2019)
  • Author(s): Saputro, H, Mikami, M, Seo, T
  • Organizer: 12th Asia-Pacific Conference on Combustion
  • Int'l Joint Research
• [Presentation] 長時間微小重力場におけるランダム分散液滴群の群燃焼発生限界付近における局所燃え広がり特性に関する研究 (2019)
  • Author(s): 松本昂大
  • Organizer: 日本機械学会中国四国学生会 第49回学生員卒業研究発表講演会
• [Presentation] Results from “Group Combustion” experiments on flame spread over droplet clouds aboard Kibo/ISS (2018)
  • Author(s): Masato Mikami
  • Organizer: ISS R&D2018
  • Int'l Joint Research
• [Presentation] A Study of Flame Spread of n-Decane Droplet Arrays with Fuel-Vapor Jet at High Pressures in Microgravity (2018)
  • Author(s): Ryo Uneyama
  • Organizer: 37th International Symposium on Combustion, WiPP posters
  • Int'l Joint Research
• [Presentation] Flame-spread limit from interactive burning droplets in microgravity (2018)
  • Author(s): Yasuko Yoshida
  • Organizer: 37th International Symposium on Combustion
  • Int'l Joint Research
• [Presentation] 微小重力場における干渉二液滴を含む不等直径液滴列の燃 え広がり特性に関する調査 (2018)
  • Author(s): 永田拳太郎
  • Organizer: 日本マイクログラビティ応用学会第30回学術講演会
• [Presentation] ISS「きぼう」における「Group Combustion」実験結果 －微小重力場におけるランダム分散液滴群の局所燃え広がり 限界－ (2018)
  • Author(s): 吉田泰子
  • Organizer: 日本マイクログラビティ応用学会第30回学術講演会
• [Presentation] 微小重力場におけるランダム分散液滴群の燃え広がり特性 -燃え広がり経路が局所燃え広がり速度に及ぼす影響 - (2018)
  • Author(s): 吉田泰子
  • Organizer: 第56回燃焼シンポジウム
• [Presentation] A Study of Flame Spread of n-Decane Droplet Arrays with Fuel-vapor Jet at High Pressures in Microgravity (2018)
  • Author(s): Ryo Uneyama
  • Organizer: The 7th Joint Conference on Renewable Energy and Nanotechnology
  • Int'l Joint Research
• [Book] A Gallery of Combustion and Fire, 4.2.3 Flame Spread over a Randomly Distributed Droplet Cloud Aboard Kibo/ISS (2020)
  • Author(s): Masato Mikami, Masao Kikuchi
  • Total Pages: 184
  • Publisher: Cambridge University Press