建筑火灾增长阶段室内温度的时间特性研究

为研究建筑火灾增长阶段室内温度的时间变化规律,提出了高温烟气的主要几种热损失的计算方法,发展了受火室与未受火室及环境的热平衡方程,并采用牛顿-拉菲尔森法迭代得到受火室的温度变化.计算了慢速、中速、快速、超快速四种火灾增长速率下,受火室气相温度及烟气热损失随时间的变化.本文的研究方法及有关结果可以为建筑防火及安全疏散提供有力依据.

Variation of room temperature in growth stage of building fire

To study the temperature variation of a fire room in fire growth stage, several methods for calculation of the major heat losses of hot gases are presented, and the thermal equilibrium equation among the fire room, neighboring room and environment is developed. The Newton-Raphson iteration method is applied to solve the thermal equilibrium equation on a series of discrete times, whereby the variation of room temperature is obtained. As an example, the variation of the temperature and heat loss of the air in the fire room are calculated. The research method and corresponding results provide beneficial basis for building fire prevention and evacuation.