Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Hot‐Particle Ignition of Typical Fuels in the Wildland‐Urban Interface and Subsequent Fire Behaviors
https://orcid.org/0009-0004-1989-6668
https://orcid.org/0000-0002-0584-8452
ABSTRACTThe hot‐particle ignition is a common cause of wildland and building fires. This study investigates the ignition of three typical fuels (straw, pine needles, and cotton) in the wildland‐urban interface (WUI) by a hot metal particle of different temperatures and void ratios. In the absence of wind, the ignition of cotton is the easiest, where a flame occurs directly without clear smoldering. As the particle becomes hollow, the required minimum particle temperature for igniting cotton becomes smaller, because of a longer contact time between particle and fuel surface. Once ignited, the flaming of cotton is the weakest, with a mass loss of less than 25% because of an intensive charring. The burning of straw and pine needles is intense, with a large flame height and very little residue. Materials with finer and thinner structure like cotton are easy to initiate a flame by a hot particle while hard to sustain smoldering ignition. The hollow‐structure or large‐porosity materials like straw are prone to smoldering ignition under a weaker spot heating source. The fast‐cooling void particles cannot induce a smoldering ignition of all three WUI fuels, because smoldering ignition requires a longer effective heating duration. This study helps understand the ignition propensity of WUI fuels by a hot particle and the subsequent flame‐spread and burning process, which supports the fire protection design for WUI communities.
Hot‐Particle Ignition of Typical Fuels in the Wildland‐Urban Interface and Subsequent Fire Behaviors
https://orcid.org/0009-0004-1989-6668
https://orcid.org/0000-0002-0584-8452
ABSTRACTThe hot‐particle ignition is a common cause of wildland and building fires. This study investigates the ignition of three typical fuels (straw, pine needles, and cotton) in the wildland‐urban interface (WUI) by a hot metal particle of different temperatures and void ratios. In the absence of wind, the ignition of cotton is the easiest, where a flame occurs directly without clear smoldering. As the particle becomes hollow, the required minimum particle temperature for igniting cotton becomes smaller, because of a longer contact time between particle and fuel surface. Once ignited, the flaming of cotton is the weakest, with a mass loss of less than 25% because of an intensive charring. The burning of straw and pine needles is intense, with a large flame height and very little residue. Materials with finer and thinner structure like cotton are easy to initiate a flame by a hot particle while hard to sustain smoldering ignition. The hollow‐structure or large‐porosity materials like straw are prone to smoldering ignition under a weaker spot heating source. The fast‐cooling void particles cannot induce a smoldering ignition of all three WUI fuels, because smoldering ignition requires a longer effective heating duration. This study helps understand the ignition propensity of WUI fuels by a hot particle and the subsequent flame‐spread and burning process, which supports the fire protection design for WUI communities.
Hot‐Particle Ignition of Typical Fuels in the Wildland‐Urban Interface and Subsequent Fire Behaviors
https://orcid.org/0009-0004-1989-6668
https://orcid.org/0000-0002-0584-8452
ABSTRACTThe hot‐particle ignition is a common cause of wildland and building fires. This study investigates the ignition of three typical fuels (straw, pine needles, and cotton) in the wildland‐urban interface (WUI) by a hot metal particle of different temperatures and void ratios. In the absence of wind, the ignition of cotton is the easiest, where a flame occurs directly without clear smoldering. As the particle becomes hollow, the required minimum particle temperature for igniting cotton becomes smaller, because of a longer contact time between particle and fuel surface. Once ignited, the flaming of cotton is the weakest, with a mass loss of less than 25% because of an intensive charring. The burning of straw and pine needles is intense, with a large flame height and very little residue. Materials with finer and thinner structure like cotton are easy to initiate a flame by a hot particle while hard to sustain smoldering ignition. The hollow‐structure or large‐porosity materials like straw are prone to smoldering ignition under a weaker spot heating source. The fast‐cooling void particles cannot induce a smoldering ignition of all three WUI fuels, because smoldering ignition requires a longer effective heating duration. This study helps understand the ignition propensity of WUI fuels by a hot particle and the subsequent flame‐spread and burning process, which supports the fire protection design for WUI communities.
Hot‐Particle Ignition of Typical Fuels in the Wildland‐Urban Interface and Subsequent Fire Behaviors
Fire and Materials
Wang, Kaifeng (Autor:in) / Wang, Supan (Autor:in) / Huang, Xinyan (Autor:in)
09.01.2025
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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