Influences of Sub-Atmospheric Pressure on Upward Flame Spread over Flexible Polyurethane Foam Board with Multiple Inclinations

Applied Sciences

Ran Tu¹  Yi Zeng¹  Xuejin Zhou¹  Xin Ma²  Qixing Zhang² 

[1] College of Mechanical Engineering and Automation, Huaqiao University, Xiamen 361021, Fujian, China;State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, Anhui, China;

关键词: sub-atmospheric pressure;    inclination;    flame spread;    burning characteristics;    flame morphology;   

DOI  :  10.3390/app10207117

来源: DOAJ

【 摘 要 】

Fire propagation and burning characteristics of upward flame spread over flexible polyurethane (FPU) foam board were investigated under coupling effects of pressure and orientation. As a further comparative research of our previous work, three pressures (70, 85 and 100 kPa) and four fuel surface inclination angles (0°, 30°, 60°, 90°) were applied, respectively, as before, to study the variation of typical parameters including flame spread rate (FSR), burning rate, heat transfer components, flame length, etc. First, a phenomenological interpretation was taken to show the special spreading process with melting flow combustion and flash burning observed. Second, an overall theoretical analysis was proposed to reveal the individual or coupling effects of pressure and inclined burning surface on spreading behavior. A semi-quantitative correlation was developed and formulated to show the tendency of FSR as a function of pressure, inclination and other burning parameters, which was validated by data in paper. Meanwhile, comparison of detailed differences between upward and downward spread was conducted to give a full insight on FPU fire development. At last, comprehensive discussions of coupling effects on variation of spreading characteristics and heat transfer mechanisms were performed based on fire dynamics.

【 授权许可】

Unknown