Fire suppression studies

Novozhilov, Vasily

doi:10.2298/tsci0702161n

Cited by 14 publications

(8 citation statements)

References 25 publications

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“…Sprinkler-based fire suppression mainly relies on the water flow cascading on the fuel surfaces [26][27][28]. This cascading water flow pre-wets and cools the fuel resulting in reduced fire spread over the surface and fuel supply rate.…”

Section: Model Descriptionmentioning

confidence: 99%

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Numerical Simulation of Sprinkler Suppression of Rack Storage Fires

Wang¹,

Meredith²,

Zhou³

et al. 2014

Fire Saf. Sci.

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Fire suppression tests with ceiling sprinkler protection in a rack storage fuel configuration are simulated using a Computational Fluid Dynamics tool. The fuel is arranged in a double-row, six pallet-load wide and three-tier high (2×6×3) rack storage array. Each pallet load consists of three nested double-wall corrugated cardboard boxes surrounding a metal liner. Two types of ceiling sprinklers are used in this study: a pendent quick response sprinkler designated as K14, and an upright standard response sprinkler designated as K11.2. The tests are simulated using FireFOAM, which couples necessary sub-models for fire growth, sprinkler response, and fire suppression. Numerical results are compared with experiments for both free burn tests under a 20-MW calorimeter and sprinkler suppression tests under a 7.6 m high ceiling. For the free burn case, the model results show good quantitative agreement of heat release rates in all three phases, from ignition to fire growth and steady burning. For the suppression cases, the model reproduces the suppression effectiveness of the two sprinkler protection designs: K14 sprinklers suppress the fire rapidly with only one sprinkler activation, while with K11.2 sprinklers, both in the tests and simulation, the fire spreads to the pallets on the end of the fuel array with multiple sprinkler activations. The modeled sprinkler activation times are within the estimated experimental uncertainty following three repeat tests. Quantitative results characterizing sprinkler suppression performance obtained from the simulations, such as the actual delivered density (ADD) and water evaporation rate, are also reported.

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Section: Model Descriptionmentioning

confidence: 99%

“…[15,16,20]. It is noted that gas phase extinction, another suppression mechanism that is more relevant to water mist system [28], is not considered in the current gas phase model. However, the cooling of the gas phase due to water evaporation is included in both the spray and water film models.…”

Section: Model Descriptionmentioning

confidence: 99%

Numerical Simulation of Sprinkler Suppression of Rack Storage Fires

Wang¹,

Meredith²,

Zhou³

et al. 2014

Fire Saf. Sci.

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“…Production of hot gases during fire mainly --------------* Corresponding authors, e-mails: r_mouangue@yahoo.fr depends not only on the HRR of the source but also on the ventilation level of the compartment. If an unexpected fire is not suppressed [1], the produced hot gases could provoke a generalization of fire in the entire room whether its temperature exceeds 600 °C because of the emitted radiation, which can ignite potential combustibles far from the source [2][3][4][5]. Compartment fires have as principal characteristic the relative lack of air in the combustion process.…”

Section: Introductionmentioning

confidence: 99%

Effect of ratio between incoming cool air and outgoing hot gases on behaviour of compartment fire

et al. 2021

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Many factors have an influence on the development of compartment fire notably on its heat release rate as well as on its capability to propagate and become a flashover situation. The main element which rapidly conveys fire from a compartment to another is hot smoke flowing out through openings of the compartment source of fire. The present work aims to experiment the impact of the variation of heat release rate of the source on the behaviour of fire. So, five fire tests with different heat release rates were thus carried out in a reduced scale room. Temperature of burned gases inside the room, were measured during tests by sensors connected to a data acquisition system. Results revealed that temperature of burned gases as well as its content in carbon monoxide, evolves differently according to two ranges of the incoming air/outgoing gases ratio. The first range of which the ratio is lower than 2, corresponds to the case where both parameters decrease rapidly. The second range of which the ratio is higher than 2, corresponds to the case where both parameters decrease moderately. The transition from the first to the second range, points out the passing from the ventilation-controlled fire to the fuel-controlled fire. A relation expressing the variation of the mass flow rate of outgoing burned gases according to the heat release rate of the fire source has been given.

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“…Investigations of shock wave and heterogeneous detonation propagation in gasparticle mixtures are important for providing the explosion safety in various industrial processes [1,2] and for development of a detonation engine [3,4]. This research area is often characterized by lack of fundamental knowledge about the physical processes responsible for initiation, propagation, and decay of explosive and detonation waves, as well as difficulties in experimental modeling of these processes.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of shock wave propagation in 2-D channels with obstacles filled with chemically reacting gas suspensions

2019

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Modification of the serial Fortran code for solving unsteady 2-D Euler equations for the mixture of compressible gas and polydisperse particles was carried out using OpenMP technology. Modified code was verified and parallel speed-up was measured. Analysis showed that the data on parallel efficiency is in a good agreement with the Amdahls law, which gives the estimate for serial code fraction about 30%. Parallel code was used for the numerical simulation of two testcases, namely shock wave propagation in 2-D channel with obstacles filled with reactive Al-O 2 gas particle mixture and heterogeneous detonation propagation in polydisperse suspensions. For the first test-case the data on particles distribution in the flow was obtained, the existense of particle free zones inside the vortices was demonstrated and the attenuation of a shock wave was studied. In the second test, numerical simulation of detonation shock wave propagation in plain 2-D channel for the three polydisperse mixtures was carried out and data on detonation regimes was also obtained.

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Fire suppression studies

Cited by 14 publications

References 25 publications

Numerical Simulation of Sprinkler Suppression of Rack Storage Fires

Numerical Simulation of Sprinkler Suppression of Rack Storage Fires

Effect of ratio between incoming cool air and outgoing hot gases on behaviour of compartment fire

Numerical simulation of shock wave propagation in 2-D channels with obstacles filled with chemically reacting gas suspensions

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