烟囱效应形成机理的实验  

Experimental study on the generation mechanism of stack effect

作　　者：张靖岩[1] 霍然[1] 王浩波[1] 冯瑞[1] 

机构地区：[1]中国科学技术大学火灾科学国家重点实验室,安徽合肥230027

出　　处：《中国科学技术大学学报》2006年第1期73-76,共4页JUSTC

基　　金：国家重点基础研究发展规划项目(2001CB409604)资助

摘　　要：依据相似原理建立小尺寸竖井实验台,研究了竖井底部温度和前室补气口流速随火源与竖井中心线距离的变化规律,建立了稳态条件下的竖井内温度、速度分布模型.研究结果表明,烟囱效应的产生主要是由于竖井内外压差与烟气自身浮力的联合作用,但是在不同范围内所发挥的作用不同:在火源距离竖井中心线较近区域(l/L<0.825),竖井内外压差起主要作用;在火源距离竖井中心线较远区域(l/L>0.825),烟气的自身浮力起主要作用.Based on the comparability theory, a scaling shaft model was established for studying how temperature on the bottom of shaft and the velocity on the opening of the fire room change with distance between fire source and the centerline of shaft, and a new steady model for the distribution of temperature and velocity was introduced. It is shown that the occurrence of stack effect is due to the combined buoyancy-and pressure-driven flow in a vertical shaft generally, but each force is dominant in some characteristic domain, pressure difference plays an important role where l/L〈0. 825, and when l/L〉0. 825, buoyancy is the most important factor.

关 键 词：烟囱效应 浮力驱动 压力驱动 竖井 

分 类 号：TK121[动力工程及工程热物理—工程热物理] X932[动力工程及工程热物理—热能工程]