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Efficiency of sustained burning of layered leaf fuels under external radiant heat flux
Efficiency of energy release by burning of layered leaf fuels under external radiant heat flux was studied using a cone calorimeter. By performing the ignition and sustained burning measurements with coniferous and broadleaf plants, a method was developed to determine the combustion efficiency during sustained burning χc. Experimental results showed that at the same radiant heat flux, an increase in the sample mass (density) leads to substantial decrease in χc followed by a level‐off, and the increase in leaf moisture content results in significant reduction of χc. Analysis indicated that χc is essentially independent to the sample mass when a sample is constituted by three layers. By defining a ratio of the amount of CO produced to that of O2 consumed during measurement ϕCO/O2, χc was found to be well correlated by ϕCO/O2 with the form χc = 0.2166ln[0.4655/(ϕCO/O2 − 0.03177)], thereby highlighting that energy release efficiency of a sample mainly relies on the extent of O2 consumed to convert into CO. The parameter χc acts as an indicator to reveal the combustion states of a fuel during testing, and the parameter ϕCO/O2 can be used as an index to evaluate the capacity of leaf fuels to emit toxic gases in specific fire scenarios.
Efficiency of sustained burning of layered leaf fuels under external radiant heat flux
Efficiency of energy release by burning of layered leaf fuels under external radiant heat flux was studied using a cone calorimeter. By performing the ignition and sustained burning measurements with coniferous and broadleaf plants, a method was developed to determine the combustion efficiency during sustained burning χc. Experimental results showed that at the same radiant heat flux, an increase in the sample mass (density) leads to substantial decrease in χc followed by a level‐off, and the increase in leaf moisture content results in significant reduction of χc. Analysis indicated that χc is essentially independent to the sample mass when a sample is constituted by three layers. By defining a ratio of the amount of CO produced to that of O2 consumed during measurement ϕCO/O2, χc was found to be well correlated by ϕCO/O2 with the form χc = 0.2166ln[0.4655/(ϕCO/O2 − 0.03177)], thereby highlighting that energy release efficiency of a sample mainly relies on the extent of O2 consumed to convert into CO. The parameter χc acts as an indicator to reveal the combustion states of a fuel during testing, and the parameter ϕCO/O2 can be used as an index to evaluate the capacity of leaf fuels to emit toxic gases in specific fire scenarios.
Efficiency of sustained burning of layered leaf fuels under external radiant heat flux
Wang, Hai‐Hui (author) / Yao, Feng‐Qi (author) / Tao, Jun‐Jun (author) / Zhu, Feng (author)
Fire and Materials ; 44 ; 121-129
2020-01-01
9 pages
Article (Journal)
Electronic Resource
English
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