INFLUENCE OF THE FIRE SOURCE POSITION ON THE HOT GAS LAYER TEMPERATURE IN A MULTI-COMPARTMENT SCENARIO

2020 ◽  
Author(s):  
Rodolfo Prediger Helfenstein ◽  
Calisa Katiuscia Lemmertz ◽  
Felipe Roman Centeno
Keyword(s):  
Source Position ◽  
Hot Gas ◽  
Fire Source ◽  
Gas Layer

On the Use of Metal Sheathed Thermocouples in a Hot Gas Layer Originating from a Room Fire

1995 ◽  
Vol 13 (4) ◽  
pp. 257-260 ◽  
Author(s):  
J.C. Jones
Keyword(s):  
Hot Gas ◽  
Gas Layer

The Forum is intended to provide for dialogue and discussion among fire experts, scientists and consultants. Contributions to The Forum will not be refereed in the conventional sense, but will be subject to review by the Journal's Editorial Board relative to appropriateness, clarity, timeliness, and scope of interest. The Editorial Board will be the sole judge of those contributions to be published. Opinions expressed, however, are those of the authors and not of the Editors or Technomic Publishing Com pany, Incorporated.

scholarly journals Fire Model Test on Temperature Field in the Rescue Station of an Extralong Railway Tunnel

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Yanhua Zeng ◽  
Kelin Liu ◽  
Yong Fang ◽  
Xianfu Zhang ◽  
Yun Bai
Keyword(s):  
Temperature Field ◽  
Temperature Distribution ◽  
Model Test ◽  
Source Position ◽  
Temperature Zone ◽  
Railway Tunnel ◽  
Fire Model ◽  
Fire Source ◽  
Ventilation Condition ◽  
Chimney Effect

A rescue station is necessary for an extralong railway tunnel, whose length is generally greater than 20 km. In the rescue station, passenger evacuation, fire fighting, and protection of passengers are organized. It is important to discover the temperature distribution in a rescue station where a train is on fire. This paper performs a similarity simulation model test at 1 : 10 geometric scale to investigate the temperature field in a rescue station. A gasoline pool fire was used as the fire source. The influences of the fire source position and ventilation condition on the temperature field were studied. The results show that (a) the temperature distribution along the tunnel is stable without ventilation, the temperature is lowest when the fire occurs 50 m from the entrance; (b) the fresh air stirred up by fans promotes burning and increases the temperature; (c) the chimney effect causes the temperature field to skew in an uphill direction; (d) the opening of both fans in the adit makes the high-temperature zone to connect through; and (e) the temperature increase at the rescue station can be divided into four stages, and the response of different fire source positions to the opening of fans is not consistent. These findings provide a basis for personnel escape design and a foundation for further study of temperature distribution in a tunnel with a rescue station.

Estimating scalars from spectral radiation measurements in a homogeneous hot gas layer

2004 ◽  
Vol 137 (1-2) ◽  
pp. 222-229 ◽  
Author(s):  
Jongmook Lim ◽  
Yudaya Sivathanu ◽  
Jun Ji ◽  
Jay Gore
Keyword(s):  
Spectral Radiation ◽  
Hot Gas ◽  
Gas Layer ◽  
Radiation Measurements

Study on Source Locating Technology of Visible Fire Detection in Large Space Building

2011 ◽  
Vol 368-373 ◽  
pp. 3262-3265
Author(s):  
Zong Fang Ma ◽  
Hui Qin Wang ◽  
Dan Yang Zhao ◽  
Yan Hu ◽  
Chan Luo
Keyword(s):  
Binocular Vision ◽  
Fire Detection ◽  
Spatial Location ◽  
Source Position ◽  
Large Space ◽  
Fire Source ◽  
Location Detection ◽  
Accurate Position ◽  
The Right ◽  
Short Time

Locating fire source position is a significant aspect of automatic fire detection since it plays an important role in extinguishing fire in large space building in a short time. On the basis of previous literatures of visible fire location detection through analyzing the features of fire images, binocular vision based fire source spatial location is proposed in accordance with the computer vision principle in this paper. The binocular vision location algorithm is employed to identify the fire source position. To reach this, three typical spatial positions of fire source are measured in terms of camera scanning firstly; Secondly, confidence coefficients are added into the measured data to obtain the accurate position of fire source. Finally, the amount of water in cannon is adjusted to the right direction to put out the fire.

Effect of Fire Source Location on Flow Characteristics of Hot Gas in Tunnel Fire

2017 ◽  
Vol 2017 (0) ◽  
pp. S0540203
Author(s):  
Yuki YAMAUCHI ◽  
Sanetoshi SAITO ◽  
Hiroyuki SAITO ◽  
Hiroshi KAJIYAMA
Keyword(s):  
Flow Characteristics ◽  
Source Location ◽  
Hot Gas ◽  
Fire Source ◽  
Tunnel Fire

The Catastrophe Mechanism of Flashover in Biomass Boiler

2014 ◽  
Vol 521 ◽  
pp. 76-80
Author(s):  
Si Ke Wu ◽  
Bo Lou ◽  
Xiao Cong Wang ◽  
Kuo Ma
Keyword(s):  
Energy Equation ◽  
Initial Temperature ◽  
Calculated Data ◽  
Building Energy ◽  
Biomass Boiler ◽  
Hot Gas ◽  
Smoke Layer ◽  
Fuel Particles ◽  
The Stability ◽  
Gas Layer

The flashover phenomenon in biomass boiler causes serious damages to the equipments performance as well as security of people due to people are not clear about biomass boiler running, and thus preventing flashover from happening has a positive significance on boiler running. The characteristics of biomass fuel particles have been analyzed at first, and then simplifying the structure of boiler in order to model conveniently. This essay focus on justifying the stability of combustion system of biomass boiler with catastrophe theory in combination with the measured and calculated data, it demonstrates that swallowtail catastrophe conforms to the flashover mechanism. By building energy equation, conducting dimensionless treatment and carrying out the swallowtail catastrophe research method, the instability point is obtained. The gained critical flashover temperature of hot smoke layer is 686.71°C which is similar to predecessors studies, Then changing the parameters values for the sake of calculating different hot gas layer temperatures. The higher the hot gas layer temperature is, more hazardous the flashover tends to be. The research reveals that increasing the initial temperature of air or aggrandizing area of fire grate (larger than 3.36m2) contribute to increase flashover temperatures. However, augment of vapor heat and heat transfer area have the opposite effects.

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