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Autoignition of droplets in nondilute monodisperse clouds

✍ Scribed by Shwin-Chung Wong; Jyh-Cheng Chang; Jyh-Chyang Yang

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
699 KB
Volume
94
Category
Article
ISSN
0010-2180

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✦ Synopsis

The work investigates theoretically the transient autoignition processes of the droplets in nonconvective, nondilute, monodisperse clouds, including the evaporation of the droplet and the buildup of the fuel vapor concentration in the droplet vicinity from an initial state of concentration. Three different ignition modes are identified: local, global, and homogeneous ignition. Although the chemical reaction is confined to a narrow region in local ignition, it prevails in the interdrop space in global ignition due to the presence of significant fuel vapor. Homogeneous ignition, occurring after the droplets have vaporized completely, appears when initial droplet diameters are relatively small. Local ignition is favored when preexisting fuel vapor concentrations are low, initial droplet diameters are large, and ambient gas temperatures are high. The effects of droplet diameter, preexisting fuel vapor concentration, and ambient gas temperature on ignition modes and ignition delay times are examined. The different ignition modes correspond to the various flame propagation modes in sprays reported in previous experimental observations.

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