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Journal ArticleDOI

Combustion and fire safety of energy conservation materials in building vertical channel: Effects of structure factor and coverage rate

TL;DR: In this paper, an experimental study on combustion and fire safety of energy conservation materials (extruded polystyrene, i.e., XPS) in vertical channel with front openings of building facade is conducted, and effects of channel structure factor and curtain wall coverage rate (β) are revealed.
About: This article is published in Case Studies in Thermal Engineering.The article was published on 2021-04-01 and is currently open access. It has received 15 citations till now. The article focuses on the topics: Flame spread & Combustion.
Citations
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Journal ArticleDOI
TL;DR: In this article, the authors investigated the coupling effect of blockage and tunnel slope on spreading characteristics of fire smoke and ceiling temperature distribution in a metro depot with one closed end and compared the effect of tunnel slope and blockage on the fire plume behavior.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of grain orientation and sample thickness on the fire spread behavior of corrugated cardboard fire spread in underground logistic transportation and warehousing were investigated. But, the results were limited to three grain orientations: along grain, across grain, and across grain.

2 citations

Journal ArticleDOI
TL;DR: In this paper, the effects of parallel curtain walls on the characteristics and mass loss rate of the upward flame spread over polymethyl methacrylate (PMMA) have been experimentally studied.
Abstract: The effects of parallel curtain walls on the characteristics and mass loss rate of the upward flame spread over polymethyl methacrylate (PMMA) have been experimentally studied. The experimental research variables were the sample size and separation distance of the curtain wall. In the experimental setup, a PMMA plate was attached to one of the curtain walls. The results were analyzed to assess the effect of the curtain wall separation distance on the flame height. The special condition of two curtain walls with only a small distance between them was also analyzed. Analysis of experiments with systematically varied distances between the curtain walls has provided insight into factors such as air entrainment and the chimney effect. The results show the flame height evolution trend with the separation distance, and a new correlation to predict the global mass loss rate of the PMMA plate under the influence of parallel curtain walls, which can potentially be used in curtain wall design through optimization of the separation distance given fire safety requirements and practical needs.

2 citations

Journal ArticleDOI
TL;DR: In this paper , a small-scale experiment and Fire Dynamics Simulator (FDS) were conducted to investigate the fire behavior in a concave building with a partial sunken façade.
Abstract: The concave building structure (CBS) featured with a partial sunken façade is prevalent in the high-rise residence and comprehensive buildings. The building is a 3/4 enclosed longitudinal shaft that creates a new channel for longitudinal fire propagation. The objective of the paper is to reveal the dynamic mechanism of fire propagation in CBS. A small-scale experiment and Fire Dynamics Simulator (FDS) were conducted to investigate the fire behaviour. The results show that CBS could enhance the longitudinal propagation velocity of the flame and smoke with a slender profile. It could reduce the heat loss and create a higher space temperature than no-concave building structure (NBS). The maximum temperature and smoke concentration extended from the external facade centre to two flanks with the building height increase. Raising the structure factor extended the flame length from 7.0 m to 8.6 m. It exhibited a typical three stages of entrainment velocity growth: rapid growth, medium growth and slow growth. The flame transferred from the external façade to the lateral façade when the heat release rate was 8–10 MW. The research is essential to distinguish the hazardous region and provide a basis for architectural design and personal safe evacuation in the CBS fire scenario.

1 citations

Journal ArticleDOI
TL;DR: In this article , a small-scale experiment and Fire Dynamics Simulator (FDS) were conducted to investigate the fire behavior in a concave building with a partial sunken façade.
Abstract: The concave building structure (CBS) featured with a partial sunken façade is prevalent in the high-rise residence and comprehensive buildings. The building is a 3/4 enclosed longitudinal shaft that creates a new channel for longitudinal fire propagation. The objective of the paper is to reveal the dynamic mechanism of fire propagation in CBS. A small-scale experiment and Fire Dynamics Simulator (FDS) were conducted to investigate the fire behaviour. The results show that CBS could enhance the longitudinal propagation velocity of the flame and smoke with a slender profile. It could reduce the heat loss and create a higher space temperature than no-concave building structure (NBS). The maximum temperature and smoke concentration extended from the external facade centre to two flanks with the building height increase. Raising the structure factor extended the flame length from 7.0 m to 8.6 m. It exhibited a typical three stages of entrainment velocity growth: rapid growth, medium growth and slow growth. The flame transferred from the external façade to the lateral façade when the heat release rate was 8–10 MW. The research is essential to distinguish the hazardous region and provide a basis for architectural design and personal safe evacuation in the CBS fire scenario.

1 citations

References
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Journal ArticleDOI
TL;DR: In this paper, the effect of vertical shaft height on natural ventilation in urban road tunnel fires was investigated, and two special phenomena, plug-holing and turbulent boundary-layer separation were observed, both of which will influence the impact of smoke exhaust.

146 citations

Journal ArticleDOI
TL;DR: In this paper, a theoretical analysis was developed to predict the flame spread as a function of material properties, sample orientation, and flame spread direction, and the one-dimensional theory was in reasonable agreement with the paper data.

78 citations

Journal ArticleDOI
TL;DR: In this paper, two identical square gas burners with side length of 15 cm were used as the fire sources with propane burning in still air to estimate the heat fluxes received by horizontal targets from two buoyant turbulent diffusion flames.

77 citations

Journal ArticleDOI
TL;DR: In this article, both experimental methods and theoretical analysis are employed to investigate effects of concave structure on flame spread behaviors of XPS foam, and the results contribute to the fire hazard assessment of the XPS and fire safety design of the concave building facade.

42 citations

Journal ArticleDOI
TL;DR: In this paper, the downward flame spread over extruded polystyrene (XPS) slabs at different widths with and without sidewalls in a city at high elevation was investigated.

36 citations