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
N1 - Funding Information:
This research was supported by DLR (Deutsches Forschungszentrum für Luft- und Raumfahrt) under Contract 50WM0034 (DROP-COS B). This research was also partly subsidized by Grant-in-Aid for Young Scientists (B), 15760133, 2003, from the Ministry of Education, Science, Sports and Culture, Japan.
PY - 2004
Y1 - 2004
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).
UR - http://www.scopus.com/inward/record.url?scp=10344241489&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=10344241489&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:10344241489
SP - 21
T2 - 30th International Symposium on Combustion, Abstracts of Symposium Papers
Y2 - 25 July 2004 through 30 July 2004
ER -