Unraveling Fire Suppression Sprays

Marshall, André W.

doi:10.3801/iaffs.fss.10-61

Cited by 4 publications

(2 citation statements)

References 19 publications

(32 reference statements)

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“…The impact of design features such as sloped or curved ceilings, cloud ceilings, obstructions and other rudimentary design features on sprinkler performance is simply not understood, driving this potentially expensive and often empirical design methodology when prescriptive guidance is not available. Only now are measurement and analytical methods available to provide sufficient fidelity to unravel the complex spray patterns and their interactions with the built environment [2].…”

Section: Introductionmentioning

confidence: 99%

An Engineering Tool for Evaluation of Fire Suppression System Performance

Correa¹,

Baum²,

Marhsall³

2018

Proceedings of the 16th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Innovation in Educat

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In this paper is presented a description of a new engineering tool for evaluation of water-based fire suppression system (sprinklers), based on a high fidelity description of initial characteristics of the jet (sphere initialization from 4S device). The proposed model has three principal innovative advantages over classical Lagrangian approach: i) Speed: Fast calculation of the spray anywhere; ii) Description of the spray in the phase space, which turns the description of the spray into a time-independent, enabling compact, fast, and useful reconstruction of the spray; iii) Description of the spray as a set of 2D spray dispersion fields allowing considerable simplification of the spray field analysis. As results, a 2D visualization of the spray (volume flux), and an example of volume flux into a surface are reported.

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Section: Introductionmentioning

confidence: 99%

An Engineering Tool for Evaluation of Fire Suppression System Performance

Correa¹,

Baum²,

Marhsall³

2018

Proceedings of the 16th LACCEI International Multi-Conference for Engineering, Education, and Technology: “Innovation in Educat

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“…This jet then impinges onto a deflector to form thin sheets of water (described by the modeling scheme developed in the current study). These thin, unstable sheets then disintegrate into ligaments, which, in turn, break into droplets [1].…”

Section: Introductionmentioning

confidence: 99%

A Free-Surface Model of a Jet Impinging On a Sprinkler Head

Myers¹,

Marshall²,

Baum³

2014

Fire Saf. Sci.

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Understanding the atomization of fire sprinkler sprays fills a critical gap in the modeling of fire suppression systems. Previous research by the authors has shown an instability model coupled with a stochastic transport model can paint most of the sprinkler spray picture, but requires input in the form of thickness and velocity of unstable fluid sheets. The model outlined describes a water jet impinging on a perforated deflector plate as a velocity potential. The free surface separating the jet from the surrounding air takes the form of a vortex sheet with the air assumed to be at rest. Through the use of the Green's function, the fluid velocity potential can be posed as a boundary value problem. Any solution obtained is an exact solution to the inviscid flow equations and the interior flow a solution to the Navier-Stokes equations. The resulting model allows for the determination of the complete flow field over a sprinkler head of arbitrary geometry and input conditions. Knowledge of this flow field provides insight into the impact of sprinkler head geometry and fluid velocity as well as providing the above mentioned inputs for a complete model of fire sprinkler sprays.

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A description of the initial fire sprinkler spray

Myers

Marshall

2016

Fire Safety Journal

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a b s t r a c tAccurate representation of the fire sprinkler spray enables quantitative engineering analysis of fire suppression performance. Increasingly, fire sprinkler systems are analyzed with computational fluid dynamics (CFD) fire models where the sprinkler spray is simulated with Lagrangian particles dispersed throughout the fire induced flow. However, there is limited guidance for representing the complex, spatio-stochastic characteristics of the initial sprinkler sprays in terms of these Lagrangian particles. The present work establishes a descriptive analytical framework for the initial sprinkler spray that is rigorously grounded in statistical theory, related to local spray properties, and capable of translating highfidelity measurements into CFD inputs. This framework describes the initial sprinkler spray as a unified probability distribution function, varying over an initialization surface, and statistically representing measurements of near field local spray properties (volume flux, drop size distribution, and drop sizevelocity correlation). Lagrangian particles accurately representing the sprinkler spray may be initialized by a stochastic sampling of this probability distribution function. This novel representation enables highfidelity initialization of the sprinkler spray in CFD fire models, improving their utility in quantitative engineering analysis.

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Unraveling Fire Suppression Sprays

Cited by 4 publications

References 19 publications

An Engineering Tool for Evaluation of Fire Suppression System Performance

An Engineering Tool for Evaluation of Fire Suppression System Performance

A Free-Surface Model of a Jet Impinging On a Sprinkler Head

A description of the initial fire sprinkler spray

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