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The effect of diluent type in atmosphere on flame spread over thermally thin combustibles in microgravity
Du WF; Hu WR(胡文瑞); Du, WF (reprint author), Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Beijing 100080, Peoples R China.
Source PublicationPROGRESS IN SAFETY SCIENCE AND TECHNOLOGY, VOL III, PTS A AND B
2002
Conference Name3rd International Symposium on Safety Science and Technology (2002 ISSST)
Conference DateOCT 10-13, 2002
Conference PlaceTAI AN, PEOPLES R CHINA
AbstractThe effects of diluent type on flame spread over thermally thin combustibles for different diluents in atmospheres have been bivestigated computationally. The re-absorption effect is incorporated in the problem by solving the Radiative Transfer Equation ( RTE). The calculated results show that the diluent type in atmosphere has significant effect on the flame spread. For N(2) diluent, the radiation re-absorption in combustion zone and the surrounding atmosphere has little effect on the flame spread rate and the flame structure, thus the flame can be treated as optically thin flame, and the re-absorption can be neglected in the analysis. In this cam, at low flow velocity the radiation cooling effect becomes significant and manifests in lowered flame spread rate and flame temperature. In contrast, for CO(2) diluent the re-absorption of radiation has strong effect on the flame structure and flame spread rate. Due to re-absorption, the surrounding atmosphere near the flame will absorb the thermal radiation emitted from the combustion zone. Under such conditions the conductive and radiative heat transfer from flame to fuel surface is enhanced, the radiative heat transfer plays almost equally important role in flame spread mechanism, and the flame spread rate reaches its maximum value in quiescent microgravity. With the increase of the opposed flow velocity, the heated layer around the flame is removed, and the effect of the radiation re-absorption declines, and the flame spread rate decreases monotonically.
WOS IDWOS:000179871800258
ISBN7-03-010787-X
Indexed ByCPCI-S ; EI
Language英语
Citation statistics
Document Type会议论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/58941
Collection力学所知识产出(1956-2008)
Corresponding AuthorDu, WF (reprint author), Chinese Acad Sci, Inst Mech, Natl Micrograv Lab, Beijing 100080, Peoples R China.
Recommended Citation
GB/T 7714
Du WF,Hu WR,Du, WF . The effect of diluent type in atmosphere on flame spread over thermally thin combustibles in microgravity[C]PROGRESS IN SAFETY SCIENCE AND TECHNOLOGY, VOL III, PTS A AND B,2002.
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