Low air pressure effects on burning characteristics of typical oil with forced irradiance

5th Asia Conference on Mechanical and Materials Engineering

机械制造;材料科学

Pan, Li^1,2 ; Yuen, Richard^2 ; Jian, Wang^1

State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui

230026, China^1

Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong

999077, Hong Kong^2

关键词: Ambient pressures;    Boiling temperature;    Burning characteristics;    Combustion characteristics;    Combustion pro-cess;    Flame temperatures;    Heat flux distributions;    Plume temperature;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/241/1/012039/pdf
DOI  :  10.1088/1757-899X/241/1/012039

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In this paper, a report is given on an experimental study of the combustion characteristics of typical oil with forced irradiance under two fixed ambient pressures, which may occurred in real fires. Mass loss and flame axial heat flux distribution were measured to evaluate the hazards. The burning intensity at reduced pressure is relatively lower under the circumstance without incident irradiance because the thin air for reduced pressure may attenuate the combustion. However, the burning intensity at lower pressure is higher due to the lower boiling temperature when the irradiance reaches to 10 kW/m2.The flame could engulf sufficient air to complete the combustion process for atmospheric pressure condition compared with that under low pressure, and thus resulting in relatively higher flame temperature for a fixed flame height. While in the unified plume region, the weaker air entrainment under lower pressure leads to a poorer cooling effect, i.e. higher plume temperature.