Numerical simulation of fuel spray ignition through the comparison to a droplet in a cell

Osamu Moriue, Eiichi Murase

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Spontaneous ignition of mono-disperse spray with uniform droplet distribution was simulated through the numerical calculation of a fuel droplet in a closed cell. The model of the study handles a fuel droplet positioned at the center of a closed spherical cell. It is one-dimensional with the spherical symmetry. The gasified fuel vaporized from the droplet stays inside the cell. Thus the ignition of a droplet is comparable to that of a mono-disperse spray with uniform droplet distribution. Initially the droplet is cold, and it ignites spontaneously in a hot ambient gas. The model is fully transient and derives from mass-, species- and energy-conservation. Pressure is assumed to be spatially uniform and time-dependent. Mass fraction of each species in the gas phase and temperature in the gas and liquid phase are given as functions of time and radial coordinate. All the properties are temperature- and pressure-dependent. The calculation is continued even after the droplet disappears. Thus the ignition of fine droplets whose droplet lifetime is shorter than ignition delay can be also calculated. The employed fuels are n-heptane and n-decane. Detailed reaction models were employed for the both fuels. The effects of the initial conditions of the ambient (temperature and pressure), overall equivalence ratio and the initial droplet diameter are examined. There was transition from heterogeneous ignition to homogeneous ignition with the decrease of the initial droplet diameter. Two-stage ignition behavior was observed even for fine n-heptane droplets at an elevated pressure. Increase in overall equivalence ratio showed negative influence on cool flame appearance; however, after cool flame appearance it showed positive influence on hot flame appearance. Only hot flame ignition was observed for n-decane droplets at atmospheric pressure. The dependence of the ignition delay on the initial droplet diameter was qualitatively similar to that of n-heptane droplets at an elevated pressure.

Original languageEnglish
Title of host publication10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006
Publication statusPublished - 2006
Event10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006 - Kyoto, Japan
Duration: Aug 27 2006Sep 1 2006

Other

Other10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006
CountryJapan
CityKyoto
Period8/27/069/1/06

Fingerprint

Ignition
Computer simulation
Heptane
Gases
Temperature
Atmospheric pressure
Energy conservation

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films

Cite this

Moriue, O., & Murase, E. (2006). Numerical simulation of fuel spray ignition through the comparison to a droplet in a cell. In 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006

Numerical simulation of fuel spray ignition through the comparison to a droplet in a cell. / Moriue, Osamu; Murase, Eiichi.

10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006. 2006.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Moriue, O & Murase, E 2006, Numerical simulation of fuel spray ignition through the comparison to a droplet in a cell. in 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006. 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006, Kyoto, Japan, 8/27/06.
Moriue O, Murase E. Numerical simulation of fuel spray ignition through the comparison to a droplet in a cell. In 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006. 2006
Moriue, Osamu ; Murase, Eiichi. / Numerical simulation of fuel spray ignition through the comparison to a droplet in a cell. 10th International Conference on Liquid Atomization and Spray Systems, ICLASS 2006. 2006.
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