Research on the relationship between flame curvature and its instability by using laser irradiation method

2008 Fiscal Year Final Research Report

• Project/Area Number: 18360095
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Thermal engineering
• Research Institution: Hokkaido University
• Principal Investigator: FUJITA Osamu Hokkaido University, 大学院・工学研究科, 教授 (10183930)
• Co-Investigator(Kenkyū-buntansha): NAKAMURA Yuji 北海道大学, 大学院・工学研究科, 准教授 (50303657) ; ITO Hiroyuki 北海道大学, 大学院・工学研究科, 助教 (30372270) ; OSHIMA Nobuyuki 北海道大学, 大学院・工学研究科, 教授 (10217135)
• Project Period (FY): 2006 – 2008
• Keywords: 燃焼 / 予混合火炎 / 火炎振動伝播 / 不安定現象 / レーザー / 赤外吸収 / 火炎曲率 / 乱流燃焼

Research Abstract

エチレン空気予混合火炎にCO_2レーザーを照射すると、未燃混合気にレーザーが吸収され、局所的に任意の変形を与えることができる。この手法を用いて、予混合火炎面の火炎曲率と伝播火炎面に現れる不安定現象の相互関係を調べた。火炎に径の小さなレーザーを照射し一定値(5~6cm-1)を超える曲率を与えると、火炎先端の伝播速度が時間的に変動する不安定現象が現れることを見出した。また、この要因が先端で生じる熱物質拡散不安定性と伸張消炎と類似の物理的意味をもつ曲率消炎により引き起こされるとする物理モデルを提示した。

Research Products

• [Journal Article] Research on the Relation of Flame Front Curvature and Oscillatory Flame Propagation by External Laser Irradiation Method (2009)
  • Author(s): Tsuchimoto, M., Fujita, O., Honko, T., Nakamura, Y., and Ito, H.
  • Journal Title: Proc. Combustion Institute Vol.32 Pages: 1003-1009
  • Peer Reviewed
• [Journal Article] Effect of gravity and beam diameter on flame oscillation phenomena induced by external laser irradiation (2008)
  • Author(s): Tsuchimoto, M., Honko, T., Nakamura, Y., Ito, H. and Fujita, O.
  • Journal Title: Combustion Science and Technology 180-101 Pages: 803-1811
  • Peer Reviewed
• [Presentation] Some Features of Oscillating Downward Propagation Flames Induced by External Laser Irradiation (2009)
  • Author(s): Park, J.S., Fujita, O., Honko, T., Yamada, Y., Ito, H., and Nakamura, Y.
  • Organizer: 22nd International Colloquium on Dynamics of Explosion and Reactive Systems(22nd ICDERS)
  • Place of Presentation: Luikov Heat and Mass Transfer Institute,Minsk, Belarus
  • Year and Date: 2009-07-27
• [Presentation] レーザー照射に誘起される火炎の不安定現象 (2008)
  • Author(s): 本小輝晃, 槌本真和, 中村祐二, 伊東弘行, 藤田修
  • Organizer: 第46回燃焼シンポ
  • Place of Presentation: 京都テルサ, 京都
  • Year and Date: 2008-12-03
• [Presentation] Effect of Gravity on Flame Oscillation Phenomena (2008)
  • Author(s): Honko, T., Fujita, O., Tsuchimoto, M., Shiote,A., Nakamura, Y., and Ito, H.
  • Organizer: 7th JSME-KSME Thermal and Fluids Engineering Conference(TFEC7)
  • Place of Presentation: Sapporo, Japan
  • Year and Date: 2008-10-14
• [Presentation] Research on the Relation of Flame Front Curvature and Oscillatory Flame Propagation by External Laser Irradiation Method (2008)
  • Author(s): Tsuchimoto, M., Fujita, O., Honko ,T., Nakamura, Y., and Ito, H.
  • Organizer: 32nd Int. Symp. on Combustion
  • Place of Presentation: McGill University, Montreal, Canada
  • Year and Date: 2008-08-04
• [Presentation] Effect of Buoyancy on Flame Oscillation Phenomenon induced by External Radiation (2008)
  • Author(s): Honko, T., Fujita, O., Tsuchimoto, M., Shiote, A., Nakamura, Y., and Ito, H.
  • Organizer: Work-InProgress Poster Colloquium at 32nd Int. Symp. on Comb.
  • Place of Presentation: McGill University, Montreal, Canada
  • Year and Date: 2008-08-04
• [Presentation] レーザー径および重力が外部加熱による火炎振動伝播現象に与える影響 (2007)
  • Author(s): 槌本真和, 本小輝晃, 中村祐二, 伊東弘行, 藤田修
  • Organizer: 第45回燃焼シンポ
  • Place of Presentation: 仙台国際センター, 仙台
  • Year and Date: 2007-12-06
• [Presentation] 微小重力環境を利用した火炎振動伝播現象の発生メカニズムに関する実験的検討 (2007)
  • Author(s): 槌本真和, 本小輝晃, 中村祐二, 伊東弘行, 藤田修
  • Organizer: 第51回宇宙科学技術連合講演会
  • Place of Presentation: 札幌コンベンションセンター, 札幌
  • Year and Date: 2007-10-29
• [Presentation] 微小重力場における燃焼現象(招待講演) (2007)
  • Author(s): 藤田修
  • Organizer: 第41回応用物理学会スクール
  • Place of Presentation: 北海道工業大学, 札幌
  • Year and Date: 2007-09-05
• [Presentation] Effect of gravity and beam diameter on flame oscillation phenomena induced by external laser irradiation (2007)
  • Author(s): Tsuchimoto, M., Fujita, O., Honko,T., Nakamura, Y., and Ito, H.
  • Organizer: 21st International Colloquium on the Dynamics of Explosons and Reactive Systems(21st ICDERS)
  • Place of Presentation: 21st International Colloquium on the Dynamics of Explosons and Reactive Systems(21st ICDERS)
  • Year and Date: 2007-07-26
• [Remarks]
  • URL: http://york-me.eng.hokudai.ac.jp/