Simulation of the Atrium Fire Smoke Flow and Research about Control Studies

Once the tunnel fires happened, it will cause a major accident. And the smoke control of the runnel is important to fire prevention. A numerical simulation of the fire smoke flow in the tunnel model is presented by using FDS. The influence of different longitudinal ventilation on fire smoke flow of tunnel is obtained. And providing theory basis for tunnel ventilation system design, smoke spread control and safety evacuation. The results shown that in order to avoid reverse-flow and extend the time of smoke at the top of tunnel, the longitudinal speed should be controlled in 3.4 m/s; because of the role of longitudinal ventilation, smoke flow resistance and longitudinal ventilation generated by the effect of smoke flow resistance make the gas temperature first rise and then down.

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Fire Smoke Simulation Analysis of the Flow Characteristics in Huge Building

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.368-373.1182 ◽

2011 ◽

Vol 368-373 ◽

pp. 1182-1185

Author(s):

Chan Juan Xu ◽

Shu Ping Zhang ◽

Jing Jing Zhang

Keyword(s):

Simulation Analysis ◽

Fire Hazard ◽

Hazard Analysis ◽

Flow Characteristics ◽

Simulation Software ◽

Smoke Flow ◽

Fire Scenario ◽

Fire Smoke ◽

Convention Center ◽

Sharing Space

To a large comprehensive convention center as an example, this paper analyses the flow characteristics of fire smoke of the main hall and the feasibility for sharing space as "Quasi safety zone". First, the fire scenario was identified through the fire hazard analysis, then, set a model and take a simulation analysis by fire simulation software FDS, based on this fire scenario which have been established. At last, draw conclusions according to the smoke flow properties.

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Numerical Analysis on the Effect of Thermal Insulation of Closure on Fire Smoke Spread Rate in Building's Corridor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.513-517.2635 ◽

2014 ◽

Vol 513-517 ◽

pp. 2635-2638

Author(s):

Xuan Wei Peng

Keyword(s):

Numerical Analysis ◽

Thermal Insulation ◽

Air Temperature ◽

Spread Rate ◽

Smoke Flow ◽

External Insulation ◽

Flow Prediction ◽

Smoke Spread ◽

Fire Smoke ◽

Fire Ignition

The corridor is an important way of evacuation and rescue in building fire. The fire smoke flow prediction software developed successfully was applied to simulate a building with a 28.8 meters long corridor to investigate the effect of the different thermal insulation on fire smoke spread rate. Two representative thermal insulation, external insulation and internal insulation were compared. In 3600s fire time, air temperature in the corridor of external insulation is much lower than that of internal insulation. The air temperature gap gets narrowed between the two insulation methods in the corridor with the prolongation of fire time. Temperature difference increases as the distance increase from the fire ignition place. The corridor gets unsafe of internal insulation in 7 minute since fire ignition, while about half the length of the corridor stay secure of external insulation in 10 minutes since fire ignition. That implies more available safe egress time can be gained with external insulation than internal insulation. Smoke spread rate was numerically compared based on the air temperature variation. Smoke spread rate of internal insulation is much higher than that of external insulation and the corresponding ratio is 1.732:1.

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Heat transfer and smoke flow filling progress in a super-high atrium under influence of fire source characteristics

Journal of Fire Sciences ◽

10.1177/0734904119848120 ◽

2019 ◽

Vol 37 (3) ◽

pp. 213-235

Author(s):

Yanqiu Chen ◽

Dong Wang ◽

Junmin Chen

Keyword(s):

Heat Transfer ◽

Heat Release ◽

Heat Release Rate ◽

Release Rate ◽

Smoke Flow ◽

Fire Source ◽

Fire Smoke ◽

Smoke Layer ◽

Pressure Area ◽

Boltzmann Model

Heat transfer and smoke flow filling progress in a super-high atrium is studied in this article. The influences of heat release rate and fire source height were considered. It was found that the fire smoke layer could not reach the top of the atrium when the heat release rate was very low and the fire source was located at the bottom of the atrium. The temperature of smoke layer interface and Δ Tmax were linearly positively related to Q2/3, while Δ Pmax was quadratically positively related to Q2/3. At the top of the atrium, the temperature rise and fire source height were consistent with the Boltzmann model. As the fire smoke rose with a velocity, a relatively low-pressure area was generated below. The pressure variation in this area was negatively index-related to the fire source height.

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