Calculation of gas dynamics characteristics of flows during deflagrations at outdoor installations

Комаров, А. А.

doi:10.18322/pvb.2002.11.05.15-18

Cited by 6 publications

(10 citation statements)

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“…A portion of criticisms may also be addressed to the one-dimensional model used in the experiment. But the simulation tests of deflagration explosions in the open space that have been previously conducted in Russia and abroad have not given practically essential answers to multiple questions related to flame front dynamics during accidental explosions [3]. Dynamic parameters of the flame front (see Figure 3) suggest that at the initial stage of the explosion it accelerates but then slows down until it stops completely (the end of combustion process).…”

Section: Methodsmentioning

confidence: 99%

Experimental observation of visible flame propagation rate in accidental deflagration explosions and explosive load reduction

Комаров

Громов

2018

MATEC Web Conf.

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The article reveals the results of experimental studies of the impact exerted by an accidental explosion scenario on the visible flame propagation rate. The numerical value of the visible flame propagation rate defines the parameters of the explosive load accompanying an accidental explosion. The conducted experimental studies were used for justification of recommendations aimed at reduction of potential explosive loads during accidental events.

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Section: Methodsmentioning

confidence: 99%

Experimental observation of visible flame propagation rate in accidental deflagration explosions and explosive load reduction

Комаров

Громов

2018

MATEC Web Conf.

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“…There were calculations of supposed time relationships of blast pressure generated using the explosion [18,19]. The calculations were performed by the methodology that describes the pressure pattern outside a pulsating sphere; the sphere simulates an expanding ball of combustion products following a deflagration explosion [5,6]. The kinematic parameters of the flame front assumed in the calculations correspond to the parameters obtained in the experiment.…”

Section: Numerical Analysis Of Indoor Deflagration Combustionmentioning

confidence: 99%

“…The technical ones include difficulties creating a cloud of explosive mixture [1,2] with definite, predetermined parameters such as cloud shape and dimension and fuel density distribution in the mixture [3,4]. As for issues of a theoretical nature, there is the question of what [5,6] parameters explosive clouds under examination should have concerning accidental atmospheric explosions.…”

Section: Introductionmentioning

confidence: 99%

“…leads to mild bangs following jet fires from the emergency opening. In this case, accumulating large gas-air clouds of light gases is impossible due to their volatility and 'surfacing' propensity [5,6,[9][10][11]. Clouds of light gases might appear after liquid phase spills.…”

Section: Introductionmentioning

confidence: 99%

“…Ground drifting clouds appear in emergency emissions of heavy (relative to the air) combustible gases. Their explosion at the initial stages has a shape of a hemisphere [5,6,11,13].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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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Influence of hydrodynamic processes on apparent flame velocity in accidental explosions

Komarov,

Gromov,

Korolchenko

2023

E3S Web Conf.

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The main impact factor of an accidental explosion is explosive pressure, the numerical value of which is determined by the magnitude of the apparent flame velocity during explosive combustion of an explosive mixture. Therefore, the issues related to predicting the apparent flame velocity in deflagration explosions are the main ones when considering the problem of ensuring explosion resistance of buildings and structures and investigating accidents accompanied by explosions. Relationships are presented that confirm the unambiguous dependence of explosive pressure on apparent flame velocity. It is shown experimentally that in a deflagration explosion in free space, laminar combustion of the mixture occurs at first, so the flame front is flat and smooth, and at a certain distance from the ignition source, there is turbulization of the mixture moving in front of the flame front, and the explosive combustion becomes turbulent. The dependence determining the flame acceleration in an accidental explosion is given. It is experimentally shown that there is no rapid cessation of explosive combustion and flame arrest at the central initiation of a spherical explosive cloud of stoichiometric concentration. The methodology described in this article for determining the apparent flame velocity in deflagration explosions allows a fairly accurate prediction of the potential threat posed by explosive facilities and installations in the surrounding area.

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Calculation of gas dynamics characteristics of flows during deflagrations at outdoor installations

Cited by 6 publications

References 0 publications

Experimental observation of visible flame propagation rate in accidental deflagration explosions and explosive load reduction

Experimental observation of visible flame propagation rate in accidental deflagration explosions and explosive load reduction

Specific Aspects of Modeling Gas Mixture Explosions in the Atmosphere

Influence of hydrodynamic processes on apparent flame velocity in accidental explosions

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