A Study Of Numerical Simulation On Fire Smoke Control Within A Gymnasiums

With the development of economy and enhancement of people's living standard, Chinese people have been paying more attention to various physical exercises and the sports industry.Especially with the strong boost of the Olympic Games as well as other important sport events,investments in sports facilities,mainly stadiums,have enormously increased.As a result,many stadiums on different scales are emerging. Meanwhile,new problems arise in preventing and tackling fire accidents with the wave of stadiums' construction.Because of the large inner space and high intensity of population in the stadiums,the inability to practice division of districts designed for prevention against fire and smoke,the lack of enough oxygenized extinguishing agents for fire-fighting,the inefficiency in evacuation,and the difficulty of timely detecting fire accidents with regulate technology,the smog will spread quickly and thus make a heavy loss of life and assets once a fire accident occurs.Smog is the paramount cause of death in fire accidents,and the statistics of fire accidents from different nations show that 75%-85%of aggregate deaths in building fire accidents are killed by it.So it is necessary to make a study on smog control of the stadiums.Based on the architectural characteristics of one stadium which is still in construction and the designing principles of fire field simulation,in this paper,two representative locations are chosen as fire source places.And then,the power of fire sources is decided to accommodate to the fire source places and characteristics of the building involved in this test.The prediction of evacuation time and the choice of simulation time are made according to Safe Evacuation Evaluation Algorithm adopted in Japan,2000.Thus,the numerical simulation model of this stadium can be established.Considering that different smog controlling methods vary in the effect of mechanical effusion,this article adopts orthogonal test and develops a 3-factor & 3-level experimental design to make an analysis on the correlation between visibility, temperature and smog controlling methods by simulation.At the same time,by adopting the rank difference analysis and the variance analysis,the paper doesn't only find out the best combination of velocity of the effusion,quantity and location of the vents,but also their sequential order in terms of influence on the effect of mechanical effusion. Then it conducts an optimization study of smog controlling system in the stadium. Based on the simulation,the spreading process of smoke plume in the stadiums is also analyzed in the end.