Quantitative Studies of Cool Flame Transitions at Radiation / Stretch Extinction Using Counterflow Flames

By using the Flame Extinguishment (FLEX) experimental data from the Physical Sciences Informatics (PSI) system of combustion science, the purpose of this grant was to conduct new simulations and ground-based experiments using ozone-sensitized counterflow flames to:
1) Develop a new diagram of the flammability limits of diffusional cool flames affected by radiation, diffusion, and convection.
2) Bridge the knowledge gap between the flammability limits and extinction limits of hot flames and cool flames.
3) Verify the phenomena observed on the ISS flame extinguishment experiments.
4) Obtain new, quantitative data of extinction limit, flame temperature, and species distribution for the validation of kinetic and radiation models involving cool flames.
5) Extend the cool flame experiments from the original ISS droplet experiments to a more general ground-based combustion system involving radiation, diffusion, convection, and low-temperature chemistry while maintaining a one-dimensional geometry.

本资助项目依托燃烧科学领域物理科学信息学（Physical Sciences Informatics，PSI）系统中的灭火实验（Flame Extinguishment，FLEX）数据，旨在开展臭氧敏化逆流火焰相关的新型模拟与地面实验，具体目标如下：
1) 构建受辐射、扩散与对流影响的扩散冷焰可燃极限全新图谱。
2) 填补热火焰与冷火焰的可燃极限及熄火极限之间的认知空白。
3) 验证国际空间站（International Space Station，ISS）灭火实验中观测到的现象。
4) 获取熄火极限、火焰温度及物种分布的全新定量数据，用于验证涉及冷火焰的动力学与辐射模型。
5) 将原有国际空间站液滴实验中的冷焰实验拓展至更通用的地面燃烧系统，该系统涵盖辐射、扩散、对流与低温化学过程，且保持一维几何构型。