建筑物内火旋风中心飘移的探讨与研究

A Discussion and Study on the Center Shift Phenomena of a Building Fire-whirl

火旋风是火灾中一种较为特殊的火行为 ,是火灾安全研究的一个重要内容。针对建筑物内火旋风的行为进行研究 ,提出了一种用于描述和表征建筑物内火旋风中心飘移的分析方法。结合此方法 ,应用大涡模拟技术对火旋风中心飘移现象进行了数值模拟研究 ,得到了火旋风中心飘移的平均角速度、温度峰值、高温中心位置等重要参数。

Fire whirl is a specific fire behavior, and has been taken as one important research area of fire safety. The earlier relative studies are mainly focused on the experimental reproduction of swirled flame and numerical simulation for the flame itself. However the behavior of fire whirl is much different from the pure swirled flame. It is constructive to conduct performance based fire protection analysis and design to understand these behaviors scientifically. In this paper, the behavior of building fire whirl is studied, and an analytical method to describe and express the center shift phenomena of the building fire whirl is presented. Combined with such method, the large eddy simulation (LES) technology is employed for numerical simulation of the center shift of fire whirl, and the important parameters such as average angular velocity, peak of temperature, location of the high temperature center are obtained. [