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。

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.