Study on the influence of mobile fan combination on smoke exhaust effect of building fire
This study aimed to investigate the impact of various combinations of positive pressure mobile fans(parallel,series,upper-lower-shaped,and V-shaped)on the effectiveness of smoke exhaust during building fires.By employing a combination of experimental measurement and numerical simulation using a large eddy simulation fire dynamics model,this research exam-ines the application scenarios,smoke extraction efficiency,and necessary precautions associated with different combinations of fire smoke extraction.The results suggest that four different com-binations of fans effectively achieve the desired airflow to cover the air inlet and increase indoor pressure.Specifically,when the fans are arranged in a V-shape,the air intake effect is superior compared to other configurations within the building.It should be noted that the proximity of the two air jets can lead to the forma-tion of overlapping air cones between fans,particularly in the case of parallel-shaped and upper-lower-shaped fans.This overlap-ping can result in increased superposition of air vortices and en-ergy consumption caused by certain air cones.This paper aims to examine the practical application of series-shaped positive pres-sure mobile fans,specifically addressing the issue of decreased flow rate caused by the obstruction of the rear airflow by the mo-tor of the front fan.The objective is to verify the feasibility of em-ploying this fan combination and establish a theoretical foundation for its use in smoke exhaust during fire incidents.
building firespositive pressure mobile fanfan combi-nationsmoke extraction efficiencyFDS
NETL
NSTL
万方数据
