期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 37, 期 3, 页码 3919-3926出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2018.07.107
关键词
Compartment fire; Fire source elevation; Temperature inside compartment; Critical heat release rate; Facade flame base elevation at opening; Facade flame height
资金
- Key project of National Natural Science Foundation of China (NSFC) [51636008]
- Key Research Program of Frontier Sciences, Chinese Academy of Science (CAS) [QYZDB-SSW-JSC029]
- Fundamental Research Funds for the Central Universities [WK2320000035, WK2320000038]
This study experimentally investigated the effect of fire source elevation above the floor of a compartment on the evolution of facade flame through the opening. Experiments were conducted employing a 0.5-m cubic compartment with an opening at the centre of one sidewall and an attached facade. A porous propane burner was set inside the compartment and attached to the backwall opposite to the opening. The temperature inside the compartment and the facade flame heights were measured for different openings with burner at various heat release rates and elevations (0, 0.05, 0.10, 0.15, 0.20, 0.25, 0.30, 0.35, and 0.40 m) above floor. Results showed that for all burner elevations, the temperature inside the compartment was stratified. The temperatures of both the upper- and lower parts inside compartment first decreased significantly with increasing burner elevation until approximately the height of the opening centre, and then the temperature change was gradual with further increase in burner elevation. The critical heat release rate, when the flame was observed to eject from the opening, generally decreased with increasing burner elevation. The facade flame base elevation above bottom of opening gradually increased first with increasing burner elevation up to approximately the height of opening centre, then changed little at a constant about 0.62 H (H is opening height) with further increase in burner elevation. The facade flame height showed a general increase, although with several transitions with increase in burner elevation. A new characteristic length was proposed concerning the evolutions of temperature inside compartment and the flame base elevation (or flame vertical thickness through the opening), which determines the buoyancy of the hot gas outflow through the opening. The measured facade flame heights at various burner elevations were shown to correlate well to a newly defined non-dimensional excess heat release rate based on the proposed characteristic length. (C) 2018 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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