Numerical Modeling Of The Effect Of Fine Water Mist On The Small Scale Flame Spreading Over Solid Combustibles

Karpov, A.I.; Galat, A; Novozhilov, Vasily; Bulgakov, V. K.

doi:10.3801/iafss.fss.8-753

Cited by 20 publications

(15 citation statements)

References 14 publications

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“…We used the kinetics of thermal decomposition for deciduous and coniferous tree species [1,3,5,9] in numerical simulation. From the analysis [1,3,5,9] it can be concluded that forest materials of different regions differ in their thermophysical properties and kinetic parameters.…”

Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Studies of Suppression of Forest Combustible Material Pyrolysis under Influence of Steam-Water Curtain

2018

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Forest fires inflict enormous damage to the environment and the economy of many countries around the world. This paper presents the results of experimental and numerical studies of the suppression of the pyrolysis reaction of forest combustible materials (birch leaves, spruce needles) under the influence of water vapor. The dependences of the characteristic times of suppression of the thermal decomposition and the complete decomposition of forest combustible material on the thickness of its layer were established. We used typical model of fire source with fixed height 0.04 m and varied diameter 0.02–0.06 m. The processes of suppressing the pyrolysis reaction of forest combustible materials were recorded using a high-speed video camera (recording frequency 6∙105 fps). Numerical studies were conducted using Ansys Fluent and Matlab. The obtained results are important for the development of technologies of extinguishing forest bottom fires.

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Section: Resultsmentioning

confidence: 99%

Experimental and Numerical Studies of Suppression of Forest Combustible Material Pyrolysis under Influence of Steam-Water Curtain

2018

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“…Up to now, a large part of experimental and numerical works mainly focuses on relatively fundamental phenomena, using simplified test configurations, see for example Refs. [6,11].…”

Section: The Use Of Water Mist In Tunnelsmentioning

confidence: 99%

“…A few real-scale tunnel fire experiments have been conducted in the past, like the EUREKA program [11], the US Memorial Tunnel campaign [13], or the UPTUN project [9]. Such real-scale tests are very expensive because a large number of sensors are required to get a detailed measurement of velocity and temperature fields.…”

Section: The Use Of Water Mist In Tunnelsmentioning

confidence: 99%

Quantification of Energy Balance during Fire Suppression by Water Mist in a Mid-scale Test Tunnel

Blanchard¹,

Desanghere²,

Bouley³

2011

Fire Safety Science - Proceedings of the 10th International Sym

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This paper aims at improving the understanding of the dynamics of the interactions during water mist fire suppression in tunnels. The work described here makes extensive use of numerical simulations using the Fire Dynamics Simulator (FDS, NIST), on the basis of the numerical reconstruction of an experimental test performed at one third scale. In a first step, the method consists of determining the relevant numerical parameters to accurately model the water mist using current FDS sub-models. The second step consists of calibrating the code, in order to get the best achievable numerical processing of the test. Finally, the third part of the work is devoted to the extraction and the post processing of information from the FDS calculation, in order to quantify the global energy balance within the test tunnel. This makes it possible to evaluate the distribution of energy and notably the heat absorbed by droplets during water mist application. An estimation of the efficiency of the water application is then proposed. On the whole, this paper gives an example of the use of a numerical model to help interpreting experimental results by getting information whose measurement is very difficult to reach.

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Section: Introd Ctionmentioning

confidence: 99%

“…As a result, water flow for fire fighting reaches significant values. Therefore, one of the main challenges of founders the modern fire extinguishing systems is increase the efficiency of water use [6].The purpose of this work -the study of the evaporation of large single water droplets as it passes through the flames of oil and oil products with varying parameters of the processes (the initial size of 2-6 mm, the rate of 2-4 m / s and the temperature of the water droplets 290-300 K, the temperature of the combustion products 185-2073 K). …”

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confidence: 99%

Method for Increasing the Efficiency of Automatic Fire Extinguish System at Objects Of Power

Dmitrienko

2015

MATEC Web of Conferences

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Abstract. Operation of energy facilities requires compliance with all safety standards, and especially fire safety. Emergency situations that arise when operated the power equipment damage not only the objects of the technosphere but also the environment. In recent years, can be noted a trend of quite intensive development of technological bases of technology water mist fire extinguishing. Using the methods of optical panoramic imaging PIV, IPI and the method of high-speed video recording were performed the experimental studies of the characteristics of evaporation of large single water droplets as they pass through the flames of oil and oil products with varying parameters of the processes (the initial size of 2-6 mm, the rate of 2-4 m/s and the temperature of water drops 290-300 K, the temperature of the combustion products 185-2073 K). Was established decisive influence droplet size, velocities at which droplets enter the gaseous medium, the initial water temperature on heating rate and evaporation of droplets in a stream of high-temperature combustion products. Introd ctionFire extinguishing systems are the most promising, as water reserves in the world are practically inexhaustible. In addition, the water has a high fire-extinguishing efficiency due to cooling and phlegmatizing effects on the seat of fire. However, the relatively low ability of water to wetting the burning solid surfaces, the formation of stable barriers on the surface of the flammable liquid and the penetration into closed areas is reduces the effectiveness of its application [1][2][3][4][5]. As a result, water flow for fire fighting reaches significant values. Therefore, one of the main challenges of founders the modern fire extinguishing systems is increase the efficiency of water use [6].The purpose of this work -the study of the evaporation of large single water droplets as it passes through the flames of oil and oil products with varying parameters of the processes (the initial size of 2-6 mm, the rate of 2-4 m / s and the temperature of the water droplets 290-300 K, the temperature of the combustion products 185-2073 K).

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Numerical Modeling Of The Effect Of Fine Water Mist On The Small Scale Flame Spreading Over Solid Combustibles

Cited by 20 publications

References 14 publications

Experimental and Numerical Studies of Suppression of Forest Combustible Material Pyrolysis under Influence of Steam-Water Curtain

Experimental and Numerical Studies of Suppression of Forest Combustible Material Pyrolysis under Influence of Steam-Water Curtain

Quantification of Energy Balance during Fire Suppression by Water Mist in a Mid-scale Test Tunnel

Method for Increasing the Efficiency of Automatic Fire Extinguish System at Objects Of Power

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