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Atomization and Sprays

Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

Institutional price:	$787.00
Issues per year:	8

Best Paper Award Selection - Editorial Board Site

2005, Volume15

122 pages

Issue price - $92.00

NUMERICAL SIMULATION OF DIESEL SPRAY EVAPORATION EXPLOITING THE "STABILIZED COOL FLAME" PHENOMENON

M. A. Founti
Laboratory of Heterogeneous Mixtures and Combustion Systems, Thermal Engineering Department, School of Mechanical Engineering, National Technical University of Athens, Heroon Polytechniou 9, Polytechnioupoli Zografou, 15780 Athens, Greece

D. I. Kolaitis
Laboratory of Heterogeneous Mixtures and Combustion Systems, Thermal Engineering Department, School of Mechanical Engineering, National Technical University of Athens, Heroon Polytechniou 9, Polytechnioupoli Zografou, 15780 Athens, Greece

ABSTRACT

An alternative approach to enhance conventional liquid fuel evaporation can be based on the stabilized cool flame phenomenon. To demonstrate this, the present work numerically simulates the flow field inside an atmospheric-pressure cool flame reactor, using a two-phase computational fluid dynamics code, based on the solution of the RANS equations. Such a reactor exploits the "stabilized cool flame” phenomenon, augmenting local evaporation rates and leading to a partially oxidised mixture that can be subsequently burnt. A Eulerian-Lagrangian formulation is adopted for the description of the gas field and droplet motion equations, respectively, and a stochastic approach is implemented to account for the effects of turbulence on the droplet motion. Droplet evaporation is modeled with the use of an evaporation model incorporating the Stefan blowing effect. In addition, a semiempirical model developed especially for this purpose is used to model the heat release due to the exothermic cool flame reactions. Numerical simulations are presented for test cases with and without cool flame reactions and compared to available experimental data. The satisfactory agreement between experiments and predictions confirms the ability of the approach to simulate reasonably well the main phenomena observed in a cool flame reactor.