Radiation attenuation characteristics of pyrolysis volatiles of solid fuels and their effect for radiant ignition model

Journal Article · Fri Jan 15 04:00:00 EST 2010 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2009.06.020· OSTI ID:21248856

Zhou, Yupeng; Yang, Lizhong; Dai, Jiakun; Wang, Yafei; Deng, Zhihua ^[1]

---

1. State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, Anhui Province (China)

Radiation attenuation characteristics of pyrolysis volatiles from heated solid fuels, a neglected physical effect in radiant ignition process, are studied by simulated experiment and mathematical models. Firstly, it is experimentally found the radiation attenuation of an incident heat flux when pine or Polymethyl Methacrylate (PMMA) is heated occurs before flaming ignition (6-14%), especially for the one in the experiment of the Cone Calorimeter style apparatus with a shorter test radiation distance (D < 100 mm). Then, a more reasonable parameter using Beer's law for determining the radiation absorptivity of pyrolysis volatiles of different fuels is presented. It is found the radiation absorptivity of pyrolysis volatiles of PMMA is actually larger than the one of pine and the ignition of PMMA more depends on the gas-phase heating by radiation absorption. Finally, the calculated results with the experimental radiation attenuation data illustrates that consideration of the radiation attenuation by pyrolysis volatiles in radiant ignition models is necessary. A constant radiation attenuation coefficient G = 0.1 is approximately accepted for the general calculation of radiant ignition model. (author)

• OSTI ID: 21248856
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1 Vol. 157; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ABSORPTION
ABSORPTIVITY
ATTENUATION
CALORIMETERS
HEAT FLUX
HEATING
IGNITION
Ignition model
Incident heat flux
MATHEMATICAL MODELS
PINES
PMMA
PYROLYSIS
PYROLYSIS PRODUCTS
Pyrolysis volatiles
RADIATIONS
Radiation absorptivity
Radiation attenuation
SIMULATION
SOLID FUELS
VOLATILE MATTER