抄録
Spontaneous ignition of single n-heptane droplets in a constant volume filled with air was numerically simulated with the spherical symmetry. The numerical model was fully transient. It continues calculation even after the droplet has completely vaporized, and therefore can predict pre-vaporized ignition. Droplet was initially at room temperature, and its diameter was 1-100 μm. When the overall equivalence ratio (φ) was fixed to be sufficiently large, there was no ignition limit in terms of initial droplet diameter (d0), and the ignition delay took a minimum value at certain d0. In such a case, transition from the heterogeneous ignition to the homogeneous ignition with decreasing d0 was observed. When d0 was fixed to be so small that the ignition would not occur in an infinite volume of air, the ignition delay took a minimum value at certain φ, which was less than unity. Two-stage ignition behavior was studied with this model. Ignition delay of a cool flame had the dependence on d0 that was similar to that of ignition delay of a hot flame when φ is unity. When φ was almost zero, the ignition limit for cool flame in terms of d0 was not identified unlike that for hot flame. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).
| 元の言語 | 英語 |
|---|---|
| ページ数 | 1 |
| 出版物ステータス | 出版済み - 1 1 2004 |
| 外部発表 | Yes |
| イベント | 30th International Symposium on Combustion, Abstracts of Symposium Papers - Chicago, IL, 米国 継続期間: 7 25 2004 → 7 30 2004 |
その他
| その他 | 30th International Symposium on Combustion, Abstracts of Symposium Papers |
|---|---|
| 国 | 米国 |
| 市 | Chicago, IL |
| 期間 | 7/25/04 → 7/30/04 |
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All Science Journal Classification (ASJC) codes
- Engineering(all)
これを引用
Numerical simulations of the ignition of n-heptane droplets in the transition diameter range from heterogeneous to homogeneous ignition. / Moriue, Osamu; Mikami, Masato; Kojima, Naoya; Eigenbrod, Christian.
2004. 論文発表場所 30th International Symposium on Combustion, Abstracts of Symposium Papers, Chicago, IL, 米国.研究成果: 会議への寄与タイプ › 論文
}
TY - CONF
T1 - Numerical simulations of the ignition of n-heptane droplets in the transition diameter range from heterogeneous to homogeneous ignition
AU - Moriue, Osamu
AU - Mikami, Masato
AU - Kojima, Naoya
AU - Eigenbrod, Christian
PY - 2004/1/1
Y1 - 2004/1/1
N2 - Spontaneous ignition of single n-heptane droplets in a constant volume filled with air was numerically simulated with the spherical symmetry. The numerical model was fully transient. It continues calculation even after the droplet has completely vaporized, and therefore can predict pre-vaporized ignition. Droplet was initially at room temperature, and its diameter was 1-100 μm. When the overall equivalence ratio (φ) was fixed to be sufficiently large, there was no ignition limit in terms of initial droplet diameter (d0), and the ignition delay took a minimum value at certain d0. In such a case, transition from the heterogeneous ignition to the homogeneous ignition with decreasing d0 was observed. When d0 was fixed to be so small that the ignition would not occur in an infinite volume of air, the ignition delay took a minimum value at certain φ, which was less than unity. Two-stage ignition behavior was studied with this model. Ignition delay of a cool flame had the dependence on d0 that was similar to that of ignition delay of a hot flame when φ is unity. When φ was almost zero, the ignition limit for cool flame in terms of d0 was not identified unlike that for hot flame. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).
AB - Spontaneous ignition of single n-heptane droplets in a constant volume filled with air was numerically simulated with the spherical symmetry. The numerical model was fully transient. It continues calculation even after the droplet has completely vaporized, and therefore can predict pre-vaporized ignition. Droplet was initially at room temperature, and its diameter was 1-100 μm. When the overall equivalence ratio (φ) was fixed to be sufficiently large, there was no ignition limit in terms of initial droplet diameter (d0), and the ignition delay took a minimum value at certain d0. In such a case, transition from the heterogeneous ignition to the homogeneous ignition with decreasing d0 was observed. When d0 was fixed to be so small that the ignition would not occur in an infinite volume of air, the ignition delay took a minimum value at certain φ, which was less than unity. Two-stage ignition behavior was studied with this model. Ignition delay of a cool flame had the dependence on d0 that was similar to that of ignition delay of a hot flame when φ is unity. When φ was almost zero, the ignition limit for cool flame in terms of d0 was not identified unlike that for hot flame. This is an abstract of a paper presented at the 30th International Symposium on Combustion (Chicago, IL 7/25-30/2004).
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M3 - Paper
AN - SCOPUS:10344241489
ER -