Elucidation of Wall Chemical Effects on the Cool Flame Ignition and Extinction Process

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K14088
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 19020:Thermal engineering-related
• Research Institution: The University of Tokyo
• Principal Investigator: Lee Minhyeok 東京大学, 大学院工学系研究科(工学部), 講師 (80828426)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 冷炎 / 低温酸化反応 / PLIF / TDLAS / 壁面の化学的効果 / DME / HCHO

Outline of Final Research Achievements

In this study, we systematically investigated the effects of fuel, chemical reactivity of the wall surface, and pressure on the combustion characteristics of cool flames near wall surfaces. Wall-stabilized cool flames were formed by impinging a mixture of fuel and oxidizer on a heated wall. By depositing materials of interest on the wall surface using Microelectromechanical Systems (MEMS) technology, the chemical reactivity of the wall surface was controlled. The behavior of cool flames was identified by measuring the concentration changes of HCHO molecules using PLIF and TDLAS. Additionally, simultaneous analysis of multiple chemical species was performed using TOF-MS. The results revealed the suppressive effect of metal surface reactions on low-temperature oxidation reactions, the decrease in wall chemical effects with increasing fuel carbon chain length, and the varying effects of pressure on low-temperature oxidation reactions depending on the type of fuel.

Free Research Field

燃焼工学

Academic Significance and Societal Importance of the Research Achievements

本研究の成果は，これまで十分に解明されていなかった壁面近傍における冷炎の燃焼特性を明らかにした．燃料，圧力，壁面材料などが冷炎に及ぼす影響に対して，系統的かつ実用的データを提供するとともに，壁面安定化冷炎という新しい実験プラットフォームを通じて冷炎現象の理解を加速させている．本研究により得られた知見は冷炎の制御の可能性を示しており，次世代型燃焼機器の開発に寄与するものでもある．