摘要
利用计算流体动力学的方法,以连通地铁站和商业区的中庭为模型,研究了火源热释放速率对中庭火灾自然排烟策略的影响.火源热释放速率分别设为2,3,4 MW,模拟结果表明:中庭采用自然排烟策略,当室外环境温度低于5℃时,火源热释放速率由2MW增大到4MW的过程中,自然排烟策略失效;当室外环境温度高于25℃时,烟气可由中庭天窗稳定排出,且随着火源热释放速率的增大,自然排烟效果增强;随着室外温度的增加,中庭内外温差减小,火源热释放速率的变化对中庭自然排烟的影响减小.
The model of an atrium,combining the subway station with commercial districts,was built and the CFD（computer fluid dynamics）technology was adopted to simulate the effects of heat release rate on the natural smoke extraction strategy when fire occurs in the atrium.The heat release rate was set to be 2,3,4 MW.The simulated results indicate that,the smoke extraction strategy fails with the increase of fire heat release rate from 2 MW to 4 MW when the outdoor temperature is lower than 5 ℃.When it exceeds 25 ℃,the smoke can be extracted and the effect is better with the increase of heat release rate.With the increase of outdoor temperature and the reduction of temperature difference between outdoor and indoor environment,the effect of heat release rate on the atrium natural smoke extraction decreases.
出处
《上海理工大学学报》
CAS
北大核心
2016年第1期19-24,共6页
Journal of University of Shanghai For Science and Technology
基金
上海市科委自然科学基金资助项目(12ZR1420900)
上海市教委科研创新项目(14ZZ134)
上海市质量监督局公益科研项目(2012-12
2012-41)
关键词
中庭
数值模拟
热释放速率
自然排烟
atrium
numerical simulation
heat release rate
natural smoke extraction
