Elucidation of Near-wall Combustion Mechanism for New Flame-based Surface Functionalized Process

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H04539
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 19:Fluid engineering, thermal engineering, and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: Yuji Suzuki 東京大学, 大学院工学系研究科(工学部), 教授 (80222066)
• Co-Investigator(Kenkyū-buntansha): 赤松 史光 大阪大学, 大学院工学研究科, 教授 (10231812) ; 堀 司 大阪大学, 大学院工学研究科, 講師 (40744066) ; 范 勇 国立研究開発法人産業技術総合研究所, エネルギー・環境領域, 主任研究員 (40748662) ; 齋木 悠 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (60550499) ; 李 敏赫 東京大学, 大学院工学系研究科(工学部), 講師 (80828426)
• Project Period (FY): 2021-04-05 – 2024-03-31
• Keywords: 燃焼 / 固体壁面 / 表面機能化 / 壁面吸着種 / レーザー計測

Outline of Final Research Achievements

Flames are greatly affected by the wall chemical effects, but the conventional understanding of the combustion field in which such surface and gas-phase reactions are superimposed is extremely poor. In this study, the initial adsorption coefficient of oxygen atoms on the wall was evaluated by plasma molecular beam scattering measurements, and it was found to have a value of about 0.14 on a stainless steel wall at 800 degC, while alumina is considered inert. The effect of nitriding, which will be important when ammonia fuel is introduced in the near future, was systematically evaluated by measuring the distribution of chemical species near the stainless steel wall exposed to ammonia flame using two-photon absorption laser-induced fluorescence and other methods, and by measuring the distribution of nitrogen atoms in the material.

Free Research Field

熱工学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は，水素火炎における燃焼器ノズル内の壁面反応による逆火の抑制効果，またアンモニア燃料を用いるラジアントチューブバーナなど燃焼炉・燃焼器を構成する金属材料の「望まない窒化」による耐久性の低下に密接に関連しており，カーボンニュートラルの実現のための重要と考えられる水素，アンモニア燃焼の社会実装に重要な役割を果たすと考えられる．