Ventilation limited extinction of fires in ceiling vented compartments

被引：36

作者：

He, Qize ^{[1
,2
]}

Ezekoye, Ofodike A. ^{[2
]}

Li, Changhai ^{[1
]}

Lu, Shouxiang ^{[1
]}

机构：

[1] Univ Sci & Technol China, State Key Lab Fire Sci, Hefei 230026, Anhui, Peoples R China

[2] Univ Texas Austin, Mech Engn, Austin, TX 78712 USA

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2015年 / 91卷

基金：

中国国家自然科学基金; 高等学校博士学科点专项科研基金;

关键词：

Compartment fire; Ceiling vent; Ventilation; Flame extinction; DRIVEN FLOW-THROUGH; COMBINED BUOYANCY; HORIZONTAL VENTS; SMALL OPENINGS; EXCHANGE FLOW; CIRCULAR VENT; ENCLOSURES; SIMULATION; PRESSURE; SMOKE;

D O I：

10.1016/j.ijheatmasstransfer.2015.07.080

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Compartment fire behaviour under ceiling ventilation was experimentally investigated in a reduced-scale compartment. Different fuels, including methane, propane, N-heptane, ethanol and N-butanol, covering both gas and liquid phase fuels were used in the experiments. Measurements included gas fuel flow rate, pool fire Mass Loss Rate, gas temperature, and gas mole fraction. The fire development processes in ceiling vented compartments were described using energy and species balances. The influence of both the vent size and the fire size on energy and species transfer was examined. A ventilation limited extinction boundary was found for ceiling vented compartments and the general self-extinction processes were represented. The experimental results were plotted using a ventilation parameter (A(v)(5/4)/(Q) over dot(f)) derived from balance equations. It was found that this parameter can be used to identify the general ventilation condition in ceiling vented compartments. The oxygen concentration and gas temperature were shown to depend on the ventilation parameter. (C) 2015 Elsevier Ltd. All rights reserved.

引用

页码：570 / 583

页数：14

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