Experimental study of thermal and fire tornados

Гришин, А. М.; Golovanov, A. N.; Колесников, А. А.; Strokatov, A. A.; Tsvyk, R. Sh.

doi:10.1134/1.1881713

Cited by 12 publications

(7 citation statements)

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“…This suggests that the fire source dimension D 0 and heat release rateQ do not considerably affect the radial distribution of temperature at high elevations (Lei et al 2011(Lei et al , 2015bWang et al 2015). Moreover, the flame temperature of whirling flames has been measured to be 1.2 times that of their nonwhirling counterparts (Grishin et al 2005). This behavior is attributed to higher diffusion rates due to a better oxygen supply in fire whirls' elongated combustion region.…”

Section: Thermal Compositionmentioning

confidence: 73%

“…1 denotes the Froude number Fr based on the axial velocity component and can be used to indicate the role of buoyancy in the flame structure or formation (Emori & Saito 1982;Grishin et al 2005;Akhmetov et al 2007;Kuwana et al 2007Kuwana et al , 2008. 2 is the (vortex core) Reynolds number Re based on the azimuthal velocity component (Mullen & Maxworthy 1977), and 7 is the flow's Prandtl number Pr.…”

Section: Introductionmentioning

confidence: 99%

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Fire Whirls

Tohidi

Gollner

Xiao

2018

Annu. Rev. Fluid Mech.

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Fire whirls present a powerful intensification of combustion, long studied in the fire research community because of the dangers they present during large urban and wildland fires. However, their destructive power has hidden many features of their formation, growth, and propagation. Therefore, most of what is known about fire whirls comes from scale modeling experiments in the laboratory. Both the methods of formation, which are dominated by wind and geometry, and the inner structure of the whirl, including velocity and temperature fields, have been studied at this scale. Quasi-steady fire whirls directly over a fuel source form the bulk of current experimental knowledge, although many other cases exist in nature. The structure of fire whirls has yet to be reliably measured at large scales; however, scaling laws have been relatively successful in modeling the conditions for formation from small to large scales. This review surveys the state of knowledge concerning the fluid dynamics of fire whirls, including the conditions for their formation, their structure, and the mechanisms that control their unique state. We highlight recent discoveries and survey potential avenues for future research, including using the properties of fire whirls for efficient remediation and energy generation.

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Section: Thermal Compositionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Fire Whirls

Tohidi

Gollner

Xiao

2018

Annu. Rev. Fluid Mech.

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“…Over the past few decades, a significant body of information has accumulated on fire whirl structure and influencing factors. The different techniques used to investigate fire whirls include field [10-15, 17, 21, 22] and laboratory [1,7,18,[23][24][25][26][27][28][29][30][31][32][33][34][35][36][37] scale experiments, and analytical [1, 23-26, 30, 38, 39], physical [1,7,18,26,27,29,[33][34][35][36]40], and numerical [15,23,24,[41][42][43][44][45][46] modeling. This work has revealed some of the main features of fire whirls.…”

Section: Fire Whirl Physicsmentioning

confidence: 99%

“…They conclude that fire whirl characteristics are determined by the heat-flux density, lift force, and angular momentum of the external vortex flow. Grishin et al [35] use a Rossby number derived in a semiempirical way to determine the critical values 6 Journal of Combustion under which a fire whirl would form in their laboratory experiments. They state that the rotation velocity of a fire whirl decreases as its radius increases and increases as its height increases.…”

Section: Scaling Fire Whirlsmentioning

confidence: 99%

Review of Vortices in Wildland Fire

Forthofer

Goodrick

2011

Journal of Combustion

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Vortices are almost always present in the wildland fire environment and can sometimes interact with the fire in unpredictable ways, causing extreme fire behavior and safety concerns. In this paper, the current state of knowledge of the interaction of wildland fire and vortices is examined and reviewed. A basic introduction to vorticity is given, and the two common vortex forms in wildland fire are analyzed: fire whirls and horizontal roll vortices. Attention is given to mechanisms of formation and growth and how this information can be used by firefighters.

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“…In this work, the approach of scenario modeling [15] of forest fire danger [16]- [22] should be used. For definiteness, the article considers the following types of forest fires: low and high intensity surface forest fires, crown forest fires and firestorms [23]- [26]. Meteorological characteristics correspond to the parameters on the territory of the Republic of Buryatia (Russian Federation) [27], [28].…”

Section: Nomenclaturementioning

confidence: 99%

Mathematical Simulation of Heat Transfer in the Structures of a Passenger Carriage Under the Influence of Forest Fires

Baranovskiy

Malinin

2021

IREMOS

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Forest fires have a negative impact on the functioning of the railway. The aim of the work is a mathematical modeling of heat transfer in the structures of a passenger carriage under the influence of radiation from a forest fire front. The originality of the study is explained by modeling heat transfer in structural materials of a passenger carriage under the influence of radiation from a forest fire front. Low and high intensity surface forest fires, crown forest fires are considered. Most of the previously published works are devoted to the analysis of the causes of forest fires, including the ones near the railway. The software implementation of the mathematical model is performed in the RAD Studio software in the high-level programming language Delphi. Mathematically, heat transfer in the materials of a passenger carriage is described by nonstationary differential heat conduction equations with corresponding initial and boundary conditions. In order to solve the partial differential equations, the finite-difference method and the locally one-dimensional method are used. Difference analogs of differential equations are solved by the marching method. The main findings of the study are: 1) physical and mathematical models of heat transfer in the structures of a passenger carriage under conditions of exposure to radiation from a forest fire; 2) the obtained temperature distributions in the inhomogeneous structure of the passenger carriage wall; 3) simulation has shown that a low-intensity surface forest fire causes a relatively safe forest fire impact scenario, while a high-intensity surface forest fire impact is a potentially dangerous scenario; 4) the scenario of the impact of a crown forest fire is unambiguously dangerous at any parameters; 5) the results obtained in this paper and the expected in future investigations will create a physical basis for the development of software for fire safety systems for rolling stock on the railway. The presented results are proposed to be used for forecasting, monitoring, and assessing forest fire dangers during the operation of the rolling stock of JSC Russian Railways.

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Experimental study of thermal and fire tornados

Cited by 12 publications

References 0 publications

Fire Whirls

Fire Whirls

Review of Vortices in Wildland Fire

Mathematical Simulation of Heat Transfer in the Structures of a Passenger Carriage Under the Influence of Forest Fires

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