2024-03-28T08:27:34Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00017716
2023-01-16T04:05:49Z
320:321:322
部分予混合雰囲気中における可燃性固体の燃え拡がり
Flame Spread over Solid Fuel in a Partially Premixed Atmosphere
山本, 和弘
瀬尾, 哲
小沼, 義昭
YAMAMOTO, Kazuhiro
SEO, Satoshi
ONUMA, Yoshiaki
open access
Flame Spread
Partially Premixing
Solid Fuel
Diffusion
Heat Transfer
Usually, depending on the initial mixing of fuel and oxidizer, combustion process is classified as either non-premixed or premixed burning. Although it may be useful to consider these two modes in theoretical manner, some examples show the intermediate state or coupling modes. For example, at the leading edge of a lifted flame, the “triple” flame could be observed by partial premixing between fuel and oxidizer. Recently, it has been recognized that partially premixing is a key technique to reduce pollutant emission from the diesel combustion chamber. Thus, fundamental understanding of partially premixed phenomena is needed in the variety of combustion conditions. In this study, we investigate the flame spread over solid fuel in a partially premixed atmosphere, which may occur under poorly ventilated conditions in fire, forming the combustible mixtures of oxygen and fuel vapors. The downward flame spread is examined in a duct with opposed low-speed flow to change the conditions of atmosphere. Hydrogen, methane, and propane are added in the ambient air to observe the partially premixing effect. The fuel concentration is kept below the lean flammability limit. Results show that, in the partially premixed atmosphere, the flame spread rate is increased, with larger high temperature region. Pyrolysis region is also expanded. This could be explained by the fuel diffusion to the leading flame edge to increase the heat release rate, causing a larger amount of combustible fuel vapors.
日本燃焼学会
2003-02
jpn
journal article
AM
http://hdl.handle.net/2237/19785
https://nagoya.repo.nii.ac.jp/records/17716
1347-1864
日本燃焼学会誌
45
131
41
48
https://nagoya.repo.nii.ac.jp/record/17716/files/29.pdf
application/pdf
280.8 kB
2018-02-21