Pool Fire
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2021 ◽  
Vol 117 ◽  
pp. 104131
Author(s):  
Jiaqiang Han ◽  
Pengqiang Geng ◽  
Zihao Wang ◽  
Fei Wang ◽  
Miaocheng Weng ◽  
...  

Kerntechnik ◽  
2021 ◽  
Vol 86 (4) ◽  
pp. 260-272
Author(s):  
P. K. Sharma ◽  
V. Verma ◽  
J. Chattopadhyay ◽  
G. Vinod

Abstract A computational study has been carried out for predicting the behaviour of a pool fire source using the field-model based code Fire Dynamics Simulator (FDS). Time dependent velocity and temperature fields are predicted along with the resulting changes in the plume structure and its width. Firstly, a grid study was performed to find out the best grid size for this purpose. Then calculations were done which showed a very good agreement with earlier reported experimental based correlations for the temperature of the plume region. These studies have been extended to use this field-model based tools for modelling particular separate effect phenomena like puffing frequency and to validate against experimental data. There are several applications in nuclear industry like room fires, wildland fires, smoke or ash disposal, hydrogen transport in nuclear reactor containment, natural convection in building flows etc. In this paper the use of FDS with the advanced Large Eddy Simulation (LES) based CFD turbulence model is described for various applications: Fire simulation for Alpha storage, Bhabhatran teletherapy, pool fire for transport casks, fire PSA of a representative NPP, exhaust air fan buildings of a process plant and smoke dispersion in large fires around NPPs.


2021 ◽  
Vol 33 (8) ◽  
pp. 085109
Author(s):  
Stefan P. Domino ◽  
John Hewson ◽  
Robert Knaus ◽  
Mike Hansen

2021 ◽  
pp. 073490412110301
Author(s):  
Yawei Wang ◽  
Gaowan Zou ◽  
Conglin Liu ◽  
Y Gao

The Halon 1301 fixed gas fire extinguishing system used in ship engine rooms has been banned from production all over the world, because halon destroys the ozone layer. Therefore, it is necessary to find an environmentally friendly, compatible and efficient alternative firefighting system. In this study, we performed fire extinguishing tests in an ISO9705 standard room for four alternative fire extinguishing agents, as well as Halon 1301. The fire extinguishing efficiency of each agent was determined based on its cooling effect, dilution effect of oxygen concentration, the extinguishing time of the oil pool fire and the re-ignition probability of the wood stack. The test results provide data support for the selection of alternatives of Halon 1301 from the aspect of fire extinguishing efficiency. Among these results, Novec 1230 had the best ability to put out the oil pool fire, and HFC-227ea suppressed the wood stack fire the best. The difference between the cooling ability of each fire extinguishing agent was small, and the inert gas (IG-541) displayed the best ability to dilute oxygen. Hot aerosol required the longest time to extinguish fire. Consequently, under the existing design standards, HFC-227ea had the better firefighting efficiency, more suitable to replace Halon 1301.


2021 ◽  
pp. 103416
Author(s):  
Xueqiang Shi ◽  
Yutao Zhang ◽  
Xiaokun Chen ◽  
Yuanbo Zhang ◽  
Qian Ma ◽  
...  

2021 ◽  
Author(s):  
Kunhyuk Sung ◽  
Jian Chen ◽  
Matthew Bundy ◽  
Marco Fernandez ◽  
Anthony Hamins
Keyword(s):  

2021 ◽  
pp. 073490412110196
Author(s):  
Jian Chen ◽  
Kunhyuk Sung ◽  
Zhigang Wang ◽  
Wai Cheong Tam ◽  
Ki Yong Lee ◽  
...  

Thin filament pyrometry is used to measure the time-varying temperature field in a 1-m methanol pool fire. A digital camera with optical filters and zoom lens recorded the emission intensity of an array of 12-µm silicon–carbide filaments oriented horizontally at various heights across the steadily burning pool fire. A 50-µm-diameter thermocouple measured the temperature at locations corresponding to the filament positions. A correlation was developed between the local probability density functions of the thermocouple time-series measurements corrected for radiation and thermal inertia effects and the camera grayscale pixel intensity of the filaments. A regression analysis yields the local mean temperature and its variance. The time series of the temperature field is transformed into average values during consecutive phases of the fire’s puffing cycle, providing quantitative insight into the complex and dynamic structure of a turbulent fire.


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