Extension of definition of flame sperad considering cool flame and application to dispersed phase combustion physics for aero engine

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01532
• 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): 坂野 文菜 山口大学, 大学院創成科学研究科, 講師 (40961735) ; 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): 2021-04-01 – 2024-03-31
• Keywords: 燃焼 / 微小重力 / 液体燃料 / 液滴群 / 燃え広がり / 冷炎

Outline of Final Research Achievements

The purpose of this study is to extend the definition of the flame spread by focusing on a cool flame, which is important in the phenomenon appearing around the flame-spread limit observed in the space-based experiments conducted by our research group, and by considering the cool flame in the flame spread between droplets, which has been considered only as the hot-flame spread. The results of microgravity experiments show that a cool flame appeared around a droplet existing outside the flame-spread limit, the droplet of which was heated by the flame forming around the interactive droplets. The cool flame was also observed in the flame spread of equally spaced droplet arrays, and there were different modes of cool-flame appearance depending on the droplet spacing, even when the same mode of flame spread occurred when focusing on the hot flame.

Free Research Field

燃焼学

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．