Effect of Location Source of Fire in the Room on the Development of Gas Explosion

POLANDOV, Yu. Kh.; BABANKOV, V. A.

doi:10.18322/pvb.2014.23.3.68-74.

Cited by 6 publications

(4 citation statements)

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“…The article calculates the supposed time relationships of blast pressure generated using the explosion. The calculations were performed by the methodology describing the pressure pattern outside a pulsating sphere, simulating an expanding ball of combustion products following a deflagration explosion [6,7]. It has been demonstrated that it is the most reasonable to base computational experiments on linearized (acoustic) equations of continuum motion, as the visible flame propagation rate emerging during explosive combustion is small (compared to the speed of sound).…”

Section: Discussionmentioning

confidence: 99%

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Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Комаров

Korolchenko

Громов

et al. 2023

Fire

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Aspects of mathematical and physical modeling of deflagration explosions emerging during atmospheric (outdoor) accidental explosions are addressed. It has been demonstrated that when physically modeling accidental deflagration explosions, a stoichiometric mixture in the shape of a sphere or hemisphere supported by the ground should be used. This allows us to research the parameters of blast loads for the worst-case accidental scenarios or address the accident using the most conservative approach. A technique has been provided allowing one to create a mixture of a given blend composition in the shape of a sphere or hemisphere supported by the ground in outdoor conditions. It has been demonstrated that there is an ability to conduct modeling studies of accidental atmospheric explosions. We have provided examples of modeling studies of accidental atmospheric explosions; a methodology for analyzing experimental results has also been reviewed. The article discusses the mathematical modeling of outdoor (unobstructed) accidental deflagration explosions. It has been demonstrated that it is most reasonable to base computational experiments on linearized (acoustic) equations of continuum motion, as the visible flame propagation rate emerging during explosive combustion is small (compared to the speed of sound). There has been a satisfactory agreement between the numerical analysis and the experimental data.

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Section: Discussionmentioning

confidence: 99%

“…Based on these conservative considerations, we will also assume that accidental atmospheric explosions generate clouds containing a stoichiometric mixture [7][8][9][10][11][12][13]. We will also assume that in an accidental explosion, the clouds are of spheric or hemispheric shape, i.e., have a hemispheric shape supported by the ground.…”

Section: Introductionmentioning

confidence: 99%

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Комаров

Korolchenko

Громов

et al. 2023

Fire

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“…Більш стійким у розрахунках розривних течій є метод великих часток за рахунок наявності в різницевих схемах схемної в'язкості. В роботі [6] даний метод застосовується для розрахунку аварійних вибухів в умовах топок газових котлів. Однак, в розрахунку не враховується кінетика процесу вибухового горіння газових сумішей, яка обумовлює параметри ударної хвилі.…”

Section: методи дослідженняunclassified

Numerical simulation of an emergency explosions of the mining atmosphere

Nalisko¹

2016

Fiziko-tehničeskie problemy gornogo proizvodstva

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Purpose. Development of an effective scheme for numerical calculation of the joint solution of the problem of gas dynamics and chemical kinetics of combustion of a gas-air medium on the basis of the large-particle method. Methods. Mathematical modeling, numerical experiment, analysis and generalization and results. Findings. For joint solution of problems of gas dynamics and chemical kinetics of combustion gas environments proposed in the numerical scheme of the method of large particles concentration function, which allows to take into account the multicomponent composition of the gas medium. This function is determined at the stage of formation of the calculation area and in each cell of the calculation scheme it determines the mole fraction of each substance. The function is involved in the calculation of mass flows across the boundaries of the calculated cells, determining the mass of the overflow for each substance. The concentration function makes it possible to introduce into the numerical scheme the equations of chemical kinetics in the form of the Arrhenius equation and to distinguish the chemical reaction components and combustion products. In the problem of calculating detonation explosions, strong pressure gradients arise which, when the front of the shock wave reaches the free exit boundary, nonphysical fluctuations of the parameter are generated. To exclude their influence on the process under consideration, various types of approximation of parameters in the fictitious layer of the design scheme are analyzed. From the analysis of physical processes an effective Физико-технические проблемы горного производства 2020, вып. 22 86 form of the boundary conditions is found for a free yield for the problem of propagation of a shock wave in a channel. Originality. Modification of the numerical method of large particles due to the introduction of a concentration function allows the joint solution of the problem of gas dynamics and chemical kinetics of explosive combustion of a gas-air medium. For correct operation of the boundary conditions, a free exit into the conditions of discontinuous flows is developed for the scheme of approximation of the parameter in a fictitious layer on the basis of the shock adiabat of a particular gas. Practical implications. The modification of the large-particle method makes it possible to conduct a numerical experiment on the calculation of safe distances in emergency gas explosions in coal mine conditions, and also on the basis of calculating the propagation of a shock air wave through a channel to determine the dynamic loads on explosion-proof structures.

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“…A similar approach is implemented in the work [5]. In it, for modeling of combustion in the numerical scheme, the parameter "f " is a continuous Lagrangian marker that tracks the "source", "burned" and "burning" calculation cells.…”

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confidence: 99%

The macrokinetics parameters of the hydrocarbons combustion in the numerical calculation of accidental explosions in mines

Соболев¹,

Ustimenko²,

Nalisko³

et al. 2018

SBNMU

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Параметри макрокінетики горіння вуглеводнів у чисельному розрахунку аварійних вибухів у гірничих виробках Purpose. Obtaining effective parameters of the macrokinetics of combustion of hydrocarbons in the deflagration and detonation regime for the numerical calculation of emergency explosions in mine workings. Methodology. Mathematical modeling, numerical experiment, kinetics analysis of explosive combustion reaction, analysis and synthesis. Findings. The paper analyzes the parameters of the kinetic equation against experimental data. Obtaining such data in a physical experiment for explosive chemical reactions meets serious difficulties. This is due to the size of the reaction zone not exceeding fractions of a millimeter, the lack of time resolution of experimental techniques and other factors leading to errors in direct measurements and the emergence of multiple solutions. This possibility contributes to obtaining a simultaneous numerical solution of the equations of gas dynamics and chemical kinetics. In the numerical experiment, a direct relationship between the macrokinetic characteristics of the chemical reaction and the parameters of the discontinuous flow of the reacting gas stream is established: velocity, pressure in the front and behind the front of the detonation and deflagration wave. Based on this, Arrhenius characteristics of the reaction-preexponential and effective activation energy for the hydrocarbons under consideration are obtained. Originality. Macrokinetic parameters are established for simulating one-stage ignition and burning of the most probable hydrocarbons of the mine atmosphere in the deflagration and detonation regime. Modeling of explosive

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Effect of Location Source of Fire in the Room on the Development of Gas Explosion

Cited by 6 publications

References 0 publications

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Numerical simulation of an emergency explosions of the mining atmosphere

The macrokinetics parameters of the hydrocarbons combustion in the numerical calculation of accidental explosions in mines

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