Numerical Simulation Of Smoke Exhaust Effect In Atrium Of A Shopping Mall

Because of good lighting conditions and beautiful appearance,the courtyard building is widely used in China's large integrated shopping square,and also brings a series of fire control problems.Store atrium is a top and bottom of large space,usually shopping mall atrium combustible goods,fire hazard,numerous people,in the event of fire,smoke will spread rapidly along the atrium space,caused incalculable economic losses and casualties,so further study of store atrium spread regularity of smoke and store atrium smoke extraction efficiency and personnel safety evacuation countermeasures is the top priority.This article first introduces the mall atrium characteristics of building fire and smoke flow regularity,based on the province Wanda plaza shopping mall atrium full mathematical model is established,using the method of computer numerical simulation software Fluent,the atrium of a particular condition to carry on the transient numerical simulation of the fire can understand different time fire development and smoke extraction efficiency.This paper mainly studies the influence of the fire source location,fire intensity and the opening of the atrium side smoke exhaust window on the efficiency of the shopping mall atrium.The results show that when the power of fire source is 2MW,the smoke extraction efficiency increases slowly with the increase of time and tends to be stable.When the power of the fire source is 5MW and tends to be stable,the smoke extraction efficiency of the fire source located at the center of the atrium floor is about 1% higher than that of the fire source located at the corner of the atrium floor.It can be seen that the fire source has little influence on the smoke extraction efficiency,and the higher the fire source power,the smaler the influence.When the source of power for 2 mw,open side of the atrium smoke exhaust Windows,stable discharge smoke efficiency about 6%,when the fire power to 5 mw,exhaust efficiency increase about 3%,thus open atrium side of the atrium after smoke exhaust Windows to promote the efficiency of smoke is larger,and the source of power,the greater the smoke extraction efficiency of amplitude is smaller.The safe evacuation was judged according to the specific values of the fire products.The judgment result was that when the power of the fire source was 5MW,the safe evacuation condition was not satisfied when the fire source was located at the ground corner of the atrium of the shopping mal,and all other working conditions were satisfied.In addition,the safety evacuation evaluation method issued by Japan in 2000 was adopted in this paper to calculate the time required for people in the atrium of the shopping mall to escape from the fire site,and the available time of safety evacuation calculated by function fitting under each condition was compared and analyzed one by one,so as to determine the safety evacuation for each fire condition.The research ideas and results of this paper can provide certain reference for the design of smoke prevention and exhaust in the atrium of the shopping mall and provide technical guidance for the optimization design of smoke exhaust in the atrium of the shopping mal.