地暖对单层大空间火灾烟气运动的影响

Smoke movement in single-story large space with underfloor heating

为研究地暖采暖对单层大空间火灾烟气上升过程的影响,设计建立了小规模实验装置进行实验,并利用FDS软件模拟实验工况,通过对比实验值和模拟值证实了FDS软件模拟的可靠性。利用FDS软件,对真实采暖单层大空间的火灾烟气上升规律进行数值模拟,提出该环境中影响烟气运动的主要因素及控制措施。研究结果表明:地暖采暖环境中的火灾烟气处于不稳定状态;在地暖采暖空间中,烟气上升和顶棚射流的速度都将有所提高,从而总体加速了烟气的发展进度。

A small-scale facility was designed to carry out experiments to investigate the ascending smoke movement in singlestory large space with radiant floor heating.Experimental conditions were simulated by FDS,and the so-obtained results was used to verify the validity of FDS.simulations were performed to illustrate the smoke movement of real fire scene in large space using radiant floor heating,and main factors affecting smoke movement and control measures were studied.Study shows that the gases in enclosures with radiant floor heating are unstable.The finding shows that the underfloor heating could speed up the velocity of both the ascending gas and the ceiling jet.