DOI: 10.1016/j.combustflame.2019.11.001
论文题名: Influence of soil conditions on the multidimensional spread of smouldering combustion in shallow layers
作者: Christensen E.G. ; Fernandez-Anez N. ; Rein G.
刊名: Combustion and Flame
ISSN: 102180
出版年: 2020
卷: 214 语种: 英语
英文关键词: Biomass
; Fire
; Heat transfer
; Smouldering
; Wildfire
Scopus关键词: Air quality
; Biomass
; Deterioration
; Greenhouse gases
; Heat transfer
; Integrated circuits
; Moisture
; Moisture determination
; Soils
; Inorganic content
; Shallow layers
; Significant deteriorations
; Smouldering
; Smouldering combustions
; Soil conditions
; Vector components
; Wildfire
; Fires
; inorganic compound
; Article
; biomass
; combustion
; comparative study
; heat transfer
; oxygen supply
; peat fire
; priority journal
; smouldering combustion
; soil analysis
; soil moisture
; soil property
英文摘要: Smouldering peatland fires are capable of burning vast amounts of organic soils, resulting in the release of greenhouse gases into the atmosphere, as well as a significant deterioration of air quality resulting in major regional crises known as haze events. Fundamental understanding of smouldering fire spread is essential for the development of mitigating technologies. In this paper, we have systematically conducted 63 experiments on multidimensional smouldering spread, studying the individual and combined influence of two key factors affecting smouldering in organic soils: moisture content (MC) and inorganic content (IC). Both lateral and in-depth smouldering spread were investigated using a novel shallow reactor. This shallow depth allows a greater number of experiments to be performed in a short period of time compared to deeper samples. Lateral spread was found to decrease linearly with moisture content (R2 > 90%); while in-depth spread rate increased linearly up to 300% in samples with a moisture content of 140%. Increased inorganic content linearly decreased the lateral spread rate but had little influence on in-depth spread in drier samples. Interestingly, in wetter samples, in-depth spread was in fact sensitive to inorganic content. A novel approach combining lateral and in-depth spread rates as vector components, revealed that the global spread is independent of moisture content, with an average spread rate of 8.7 and 8.4 cm/h for 2.5 and 40% IC, with changes in direction according to moisture content; going in-depth for wet soils, and laterally for dry soils. Similarly, increasing the IC encouraged downward spread for wet samples. We also report observations of a bifurcation of lateral spread, where spread would locally extinguish where the in-depth spread was greater than the lateral spread. These findings provide previously unknown insight into the relationship between lateral and in-depth spread in smouldering fires, ultimately improving the fundamental understanding of such fires. © 2019 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158624
Appears in Collections: 气候变化与战略
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作者单位: Department of Mechanical Engineering, Imperial College London, London, SW7 2AZ, United Kingdom; Western Norway University of Applied Sciences, Haugesund, 5528, Norway
Recommended Citation:
Christensen E.G.,Fernandez-Anez N.,Rein G.. Influence of soil conditions on the multidimensional spread of smouldering combustion in shallow layers[J]. Combustion and Flame,2020-01-01,214