火灾科学国家重点实验室陈宇航老师2024年10月21日-10月25日参加第13届亚澳火灾科学技术大会（13th Asia-Oceania Symposium on Fire Science & Technology），将在校内作相关分享报告。
报告时间：2024年11月15日 17:00
报告地点：火灾特种楼209会议室
报告题目：Experimental investigation on flame geometry and downstream heat flux from diffusion flames on inclined fuel surface under sub-atmospheric pressures
报告人简介：陈宇航，博士，中国科学技术大学博士后。2022年6月获得中国科学技术大学安全科学与工程工学博士学位（导师：胡隆华研究员），2022年7月至今于中国科学技术大学开展研究工作，获公共安全科学技术学会优秀博士论文奖。主要研究方向为池火浮力扩散燃烧，特殊环境下（强风/低压等）池火动力学演化等。以第一/通讯作者在国际能源与燃烧权威期刊Progress in Energy and Combustion Science、国际燃烧学会两大会刊Combustion and Flame和Proceedings of the Combustion Institute等期刊上发表SCI论文10余篇，主持国家自然科学基金青年项目、博士后创新人才支持计划项目、博士后基金面上项目。研究工作得到了国家基金委、科技部、中科院的支持。
摘要：Fire over inclined fuel surface at sub-atmospheric pressures has not been well addressed, which is a common occurrence in wildland fires in plateau. In this work, the effect of sub-atmospheric pressure on flame geometry and downstream heating behavior of fires over inclined fuel surface was experimentally investigated. Ambient pressure P and inclination angle θ was varied from 30-101 kPa and 0°-40°. It was observed that diffusion flame tends to be dimmer and laminar portion appears to be larger at lower ambient pressures due to the inhibited soot formation and stronger molecular diffusion effect. Flame length scales parallel to the inclined surface including flame projection length and flame attachment length grow with the decreased ambient pressure and increased inclinations. Based on mass balance, flame length scales were derived to be two-thirds power of a modified dimensionless heat release rate (HRR) considering smaller flow rate of energy at reduced pressure. Total heat flux and its components including radiative and convective heat fluxes were measured to decrease as pressure and inclinations reduce. Ultimately, a power-law decay between normalized total heat flux and downstream distance was obtained in two regimes (flame attachment and plume-like regions) covering a wide range of pressure and inclination angles.
