地下车库火灾烟气运动规律的实验和数值仿真

摘要

A survey was conducted on several underground garages in Xi'an. It reveals that the frequency of vehicle access ranges from 0. 23: to 1. 33 h-1. The movements of fire smoke in underground garage were studied experimentally and numerically by FDS. The influences of exhaust flow rate, position and intensity of fire on smoke control were analyzed.. Results indicate that the increase in the exhaust flow rate by 20% may cause the soot density decreases by 1%. However, the visibility does not increase in direct proportion to the increase in the exhaust flow rate. Fire in center of the garage is the most dangerous.%对西安地区地下车库进行调研,得到汽车出入频'度范围为0.23～1.33 h-1.采用模型实验和FDS数值模拟的方法对地下车库火灾烟气运动进行研究,分析烟气运动规律以及排烟量、火源位置和强度对烟气控制方面的影响.结果表明:排烟量增大20%,烟气浓度减小7%,能见度不与排烟量的增大成正比;火源位于空间中心位置的火灾危害最大.