不同低气压环境下走廊火灾顶棚射流温度分布特征研究
Temperature Profile Characteristics of Ceiling Jet in Corridor Fires Under Various Sub-atmospheric Pressures
刘紫玮 1唐飞 1胡隆华 1孙协鹏 1张晓磊1
作者信息
- 1. 中国科学技术大学火灾科学国家重点实验室,合肥 230026
- 折叠
摘要
顶棚射流火灾蔓延是建筑火灾动力学经典科学问题之一.本文主要开展了不同低气压情况下建筑走廊顶棚射流温度分布特征研究,分析了不同低气压环境条件对走廊内贴壁受限火羽流温度演化特征的影响,发现随着环境气压的降低,走廊顶棚火焰扩展结构逐渐由半椭圆形变为"U"形;揭示了不同低气压环境对走廊火灾顶棚射流最高温升和纵向温度衰减的影响机制,建立了考虑不同低气压环境影响的走廊内顶棚下方中心和两侧温度分布的表征关系式.
Abstract
Ceiling jet is a classical scientific problem of building fire dynamics.In this work,a series of experiments were carried out to analyze the impact of sub-atmospheric pressures on the ceiling temperature profile induced by wall-attached fires in the corridor.It was found that with the decrease of atmospheric pressure,the ceiling flame extension structure changed from a semi ellipse to a"U"shape.The maximum temperature rises and longitudinal temperature decay beneath the ceiling under various sub-atmospheric pressures were revealed.The prediction models for the temperature profile in the center and both sides beneath the ceiling in the corridor were proposed,considering the impact of different sub-atmospheric pressures.
关键词
顶棚射流/走廊火灾/环境气压/火焰结构/温度分布Key words
ceiling jet/corridor fire/sub-atmospheric pressures/flame structure/temperature profile引用本文复制引用
基金项目
国家自然科学基金资助项目(52076066)
国家自然科学基金资助项目(52225605)
安徽省杰出青年基金项目资助(2208085J34)
中央高校基本科研业务费专项资金资助项目(WK2320000058)
出版年
2024
NETL
NSTL
万方数据