Role of Firebrand Combustion in Large Outdoor Fire Spread.

Large outdoor fires are an increasing danger to the built environment. Wildfires that spread into communities, labeled as Wildland-Urban Interface (WUI) fires, are an example of large outdoor fires. Other examples of large outdoor fires are urban fires including those that may occur after earthquakes as well as in informal settlements. When vegetation and structures burn in large outdoor fires, pieces of burning material, known as firebrands, are generated, become lofted, and may be carried by the wind. This results in showers of wind-driven firebrands that may land ahead of the fire front, igniting vegetation and structures, and spreading the fire very fast. Post-fire disaster studies indicate that firebrand showers are a significant factor in the fire spread of multiple large outdoor fires. The present paper provides a comprehensive literature summary on the role of firebrand mechanisms on large outdoor fire spread. Experiments, models, and simulations related to firebrand generation, lofting, burning, transport, deposition, and ignition of materials are reviewed. Japan, a country that has been greatly influenced by ignition induced by firebrands that have resulted in severe large outdoor fires, is also highlighted here as most of this knowledge remains not available in the English language literature. The paper closes with a summary of the key research needs on this globally important problem.

[1]  A. Carlos Fernandez-Pello,et al.  Wildland fire spot ignition by sparks and firebrands , 2017 .

[2]  Yoshihiko Hayashi,et al.  Mass and size distribution of firebrands generated from burning Korean pine (Pinus koraiensis) trees , 2009 .

[3]  Samuel L. Manzello,et al.  Investigation on the ability of glowing firebrands deposited within crevices to ignite common building materials , 2009 .

[4]  Yanlong Shan,et al.  New Correlation Between Ignition Time and Moisture Content for Pine Needles Attacked by Firebrands , 2014 .

[5]  Samuel L. Manzello,et al.  Exposing siding treatments, walls fitted with eaves, and glazing assemblies to firebrand showers , 2012 .

[6]  A. I. Zvyagils'kaya,et al.  Influence of moisture content and heat and mass exchange with the surrounding medium on the critical conditions of initiation of surface fire , 1996 .

[7]  Samuel L. Manzello,et al.  Ignition of Mulch Beds Exposed to Continuous Wind-Driven Firebrand Showers , 2015 .

[8]  Sara Caton.  Laboratory studies on the generation of firebrands from cylindrical wooden dowels , 2016 .

[9]  Howard R. Baum,et al.  Fire Induced Flow Field - Theory And Experiment , 1989 .

[10]  Huahua,et al.  Fire Whirls , 2017 .

[11]  Ali Tohidi,et al.  Statistical description of firebrand size and shape distribution from coniferous trees for use in Metropolis Monte Carlo simulations of firebrand flight distance , 2015 .

[12]  Judith Winterkamp,et al.  Studying wildfire behavior using FIRETEC , 2002 .

[13]  Dorian Liepmann,et al.  Brand Lofting Above Large-Scale Fires. , 1997 .

[14]  J. Jones,et al.  Predictive Calculations of the Effect of an Accidental Heat Source on a Bed of Forest Litter , 1993 .

[15]  Glenn P. Forney,et al.  Fire Dynamics Simulator (Version 2) -- Technical Reference Guide | NIST , 2001 .

[16]  Albert Simeoni,et al.  Experimental Procedures Characterising Firebrand Generation in Wildland Fires , 2016 .

[17]  Morton H. Friedman,et al.  A CORRELATION OF IMPACT SENSITIVITIES BY MEANS OF THE HOT SPOT MODEL , 1963 .

[18]  Takeyoshi Tanaka,et al.  Transport Of Disk-shaped Firebrands In A Turbulent Boundary Layer , 2005 .

[19]  Supan Wang,et al.  Ignition of expandable polystyrene foam by a hot particle: an experimental and numerical study. , 2015, Journal of hazardous materials.

[20]  Vytenis Babrauskas.  Ignition Handbook: Principles and Applications to Fire Safety Engineering, Fire Investigation, Risk Management and Forensic Science , 2003 .

[21]  M. Finney,et al.  Time to ignition is influenced by both moisture content and soluble carbohydrates in live Douglas fir and Lodgepole pine needles , 2010 .

[22]  Carlos Fernandez-Pello,et al.  Smoldering spot ignition of natural fuels by a hot metal particle , 2017 .

[23]  P. H. Thomas,et al.  A comparison of some hot spot theories , 1965 .

[24]  R. A. Anthenien,et al.  On the trajectories of embers initially elevated or lofted by small scale ground fire plumes in high winds , 2006 .

[25]  Samuel L. Manzello,et al.  Enabling the Investigation of Structure Vulnerabilities to Wind- Driven Firebrand Showers in Wildland-Urban Interface (WUI) Fires , 2014 .

[26]  S. L. Manzello,et al.  Investigating Effect of Wind Speeds on Structural Firebrand Generation in Laboratory Scale Experiments. , 2019, International journal of heat and mass transfer.

[27]  R. Hubbard,et al.  Relationships between moisture, chemistry, and ignition of Pinus contorta needles during the early stages of mountain pine beetle attack , 2012 .

[28]  Raquel S. P. Hakes,et al.  Thermal characterization of firebrand piles , 2019, Fire Safety Journal.

[29]  Sayaka Suzuki,et al.  Experimental Investigation of Firebrand Accumulation Zones in Front of Obstacles. , 2017, Fire safety journal.

[30]  J. Clark,et al.  Ignition , 2021, Unsteady Combustor Physics.

[31]  Samuel L. Manzello,et al.  Ignition of Wood Fencing Assemblies Exposed to Continuous Wind-Driven Firebrand Showers , 2016 .

[32]  Samuel L. Manzello,et al.  On the ignition of fuel beds by firebrands , 2005 .

[33]  Carlos Sánchez Tarifa,et al.  On the flight pahts and lifetimes of burning particles of wood , 1965 .

[34]  Samuel L. Manzello,et al.  Firebrand generation from burning vegetation , 2007 .

[35]  A. Filkov,et al.  Simulation of fuel bed ignition by wildland firebrands , 2018 .

[36]  Samuel L. Manzello,et al.  Characteristics of Firebrands Collected from Actual Urban Fires , 2018, Fire technology.

[37]  S. L. Manzello,et al.  Ignition of Vegetation and Mulch by Firebrands in Wildland/Urban Interface (WUI) Fires. | NIST , 2005 .

[38]  Xinyan Huang,et al.  Interaction between flaming and smouldering in hot-particle ignition of forest fuels and effects of moisture and wind , 2017 .

[39]  Samuel L. Manzello,et al.  Ignition of mulch and grasses by firebrands in wildland–urban interface fires , 2006 .

[40]  Yuji Hasemi,et al.  Firebrand deposition and measurements of collected firebrands generated and transported from a full-Scale burn test using a large wooden building , 2014 .

[41]  Benoit B. Mandelbrot,et al.  Fractal Geometry of Nature , 1984 .

[42]  S. L. Manzello.  Summary of Workshop on Global Overview of Large Outdoor Fire Standards , 2019 .

[43]  Nigel B. Kaye,et al.  Stochastic modeling of firebrand shower scenarios , 2017 .

[44]  P. C. Bowes,et al.  Self-Heating: Evaluating and Controlling the Hazards , 1984 .

[45]  Anthony Collin,et al.  Modelling of tree crowns with realistic morphological features: New reconstruction methodology based on Iterated Function System tool , 2011 .

[46]  P. Richards.  Steady Aerodynamics of Rod and Plate Type Debris , 2010 .

[47]  Samuel L. Manzello,et al.  Experiments to provide the scientific-basis for laboratory standard test methods for firebrand exposure , 2017 .

[48]  David R. Weise,et al.  Firebrands and spotting ignition in large-scale fires , 2010 .

[49]  S. L. Manzello,et al.  Quantifying wind‐driven firebrand production from roofing assembly combustion , 2018, Fire and materials.

[50]  Dorian Liepmann,et al.  Brand Propagation From Large-Scale Fires , 1999 .

[51]  Ichiro Hagiwara,et al.  Full-scale fire tests of 3-storey wooden school building , 2014 .

[52]  Sayaka Suzuki,et al.  Firebrand Production from Building Components Fitted with Siding Treatments. , 2016, Fire safety journal.

[53]  J. G. Quintiere,et al.  A unified analysis for fire plumes , 1998 .

[54]  A. Muraszew,et al.  Trajectory of firebrands in and out of fire whirls , 1977 .

[55]  Patrick J. Pagni.  Causes of the 20 October 1991 Oakland Hills conflagration , 1993 .

[56]  Samuel L. Manzello,et al.  Characterizing Firebrand Exposure from Wildland–Urban Interface (WUI) Fires: Results from the 2007 Angora Fire , 2014 .

[57]  Sayaka Suzuki,et al.  Generating Wind-Driven Firebrand Showers Characteristic of Burning Structures. , 2017, Proceedings of the Combustion Institute. International Symposium on Combustion.

[58]  B.D. Russell,et al.  Electrical characterization of vegetation contacts with distribution conductors - investigation of progressive fault behavior , 2008, 2008 IEEE/PES Transmission and Distribution Conference and Exposition.

[59]  S. L. Manzello,et al.  Initial Study on Thatched Roofing Assembly Ignition Vulnerabilities to Firebrand Showers. , 2019, Fire safety journal.

[60]  Daniel J. Gorham,et al.  Review of Pathways for Building Fire Spread in the Wildland Urban Interface Part I: Exposure Conditions , 2017 .

[61]  V. V. Reino,et al.  Ignition of a layer of combustible forest materials , 1998 .

[62]  J. Jones,et al.  Further Calculations Regarding the Accidental Supply of Heat to a Bed of Forest Material , 1994 .

[63]  Yoshihiko Hayashi,et al.  CFD Simulation of Thermal Plume and Firebrands Scattering in Urban Fire , 2004 .

[64]  Sayaka Suzuki,et al.  Experimental Investigation of Wood Decking Assemblies Exposed to Firebrand Showers. , 2017, Fire safety journal.

[65]  Samuel L. Manzello,et al.  Numerical simulation and experiments of burning douglas fir trees , 2009 .

[66]  A. C. Fernandez-Pello,et al.  Numerical study of ground-level distribution of firebrands generated by line fires , 2008 .

[67]  Samuel L. Manzello,et al.  Firebrand Generation Data Obtained from a Full Scale Structure Burn | NIST , 2011 .

[68]  Casey D. Zak,et al.  Spot Fire Ignition of Natural Fuel Beds by Hot Metal Particles, Embers, and Sparks , 2015 .

[69]  R. Kremens,et al.  Investigation of firebrand production during prescribed fires conducted in a pine forest , 2017 .

[70]  Nigel B. Kaye,et al.  Aerodynamic characterization of rod-like debris with application to firebrand transport , 2017 .

[71]  Samuel L. Manzello,et al.  Experimental investigation of structure vulnerabilities to firebrand showers , 2011 .

[72]  Supan Wang,et al.  Ignition of low-density expandable polystyrene foam by a hot particle , 2015 .

[73]  A. Carlos Fernandez-Pello,et al.  Modeling transport and combustion of firebrands from burning trees , 2007 .

[74]  Samuel L. Manzello,et al.  On the development and characterization of a firebrand generator , 2008 .

[75]  John Clifford Jones.  Improved Calculations Concerning the Ignition of Forest Litter by Hot Particle Ingress , 1995 .

[76]  V. V. Barzykin,et al.  Ignition of a condensed explosive by a hot object of finite dimensions , 1973 .

[77]  Xinyan Huang,et al.  The Wind Effect on the Transport and Burning of Firebrands , 2017 .

[78]  A. Carlos Fernandez-Pello,et al.  On the flight paths of metal particles and embers generated by power lines in high winds--a potential source of wildland fires , 1998 .

[79]  Vytenis Babrauskas,et al.  Effective heat of combustion for flaming combustion of conifers , 2006 .

[80]  Samuel L Manzello,et al.  FORUM Position Paper The Growing Global Wildland Urban Interface (WUI) Fire Dilemma: Priority Needs for Research. , 2018, Fire safety journal.

[81]  Samuel L. Manzello,et al.  Experimental investigation of firebrands: Generation and ignition of fuel beds , 2008 .

[82]  S.-L. Lee,et al.  Firebrand trajectory study using an empirical velocity-dependent burning law , 1970 .

[83]  Nigel B. Kaye,et al.  Comprehensive wind tunnel experiments of lofting and downwind transport of non-combusting rod-like model firebrands during firebrand shower scenarios , 2017 .

[84]  Bernard Porterie,et al.  Experimental validation of a numerical model for the transport of firebrands , 2009 .

[85]  Sayaka Suzuki,et al.  The Performance of Wood and Tile Roofing Assemblies Exposed to Continuous Firebrand Assault. , 2016, Fire and materials.

[86]  F. Usda,et al.  Transport of Firebrands by Line Thermals , 1983 .

[87]  Rory Hadden,et al.  Investigation of firebrand generation from an experimental fire: Development of a reliable data collection methodology , 2017 .

[88]  Samuel L. Manzello,et al.  Quantifying the vulnerabilities of ceramic tile roofing assemblies to ignition during a firebrand attack , 2010 .

[89]  James L. Urban,et al.  Ignition of a spot smolder in a moist fuel bed by a firebrand , 2019, Fire Safety Journal.

[90]  M. B. Zaturska.  An elementary theory for the prediction of critical conditions for thermal explosion , 1978 .

[91]  Samuel L. Manzello,et al.  Firebrands generated from a full-scale structure burning under well-controlled laboratory conditions , 2014 .

[92]  Samuel L. Manzello,et al.  Enabling the study of structure vulnerabilities to ignition from wind driven firebrand showers: A summary of experimental results , 2012 .

[93]  Eulàlia Planas,et al.  Summary of Workshop Large Outdoor Fires and the Built Environment. , 2017, Fire safety journal.

[94]  Yukio Tamura,et al.  Tachikawa number: A proposal , 2006 .

[95]  Samuel L. Manzello,et al.  Full-Scale Experimental Investigation to Quantify Building Component Ignition Vulnerability from Mulch Beds Attacked by Firebrand Showers , 2017, Fire technology.

[96]  Yoshifumi Ohmiya,et al.  An Investigation on the Distribution of Fire Brands and Spot Fires Due to a Hotel Fire , 2000 .

[97]  Samuel L. Manzello,et al.  The size and mass distribution of firebrands collected from ignited building components exposed to wind , 2013 .

[98]  E. Pastor,et al.  Mathematical models and calculation systems for the study of wildland fire behaviour , 2003 .

[99]  O. A. Ezekoye,et al.  Thermo-mechanical modeling of firebrand breakage on a fractal tree , 2013 .

[100]  A. Carlos Fernandez-Pello,et al.  Ignition of Combustible Fuel Beds by Hot Particles: An Experimental and Theoretical Study , 2011 .