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  • 1
    Publication Date: 1993-06-01
    Print ISSN: 1386-6184
    Electronic ISSN: 1573-1987
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Flow, turbulence and combustion 51 (1993), S. 519-524 
    ISSN: 1573-1987
    Keywords: mixing and chemical reactions ; turbulent combustion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The process of auto-ignition in a non-premixed, homogeneous and isotropic turbulent medium is considered. The governing pdf transport equation is simulated via a Monte Carlo method. It is found that the pdf evolution depends on the relative magnitudes of two time scales, namely, that of turbulent mixing and of chemical reaction. Calculations made for a wide range of these time scales show that at least four different regimes of auto-ignition may be identified. These are classified into premixed and non-premixed type, and are located on a Damköhler number diagram.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Meccanica 31 (1996), S. 177-193 
    ISSN: 1572-9648
    Keywords: Droplet size distribution ; Spray ; Laminar flame ; Combustion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Description / Table of Contents: Sommario Nel presente lavoro vengono modellate e simulate numericamente fiamme a spruzzo premescolate, stazionarie e laminari. La fase gassosa viene descritta in forma euleriana dalle equazioni che governano la conservazione della massa totale, della quantità di moto, dell'energia e della massa delle singole specie. La fase liquida viene descritta in forma lagrangiana dall'equazione di continuità globale che si riduce and una equazione per la dimensione della goccia, le equazioni del moto, l'equazione dell'energia e una equazione di trasporto della funzione densità di goccia. L'ultima è la cosiddetta ‘equazione dello spruzzo’, che, ad ogni posizione nel campo di flusso chimicamente reagente, descrive la distribuzione congiunta della dimensione, della velocità e della temperatura della goccia. Nel presente lavoro l'equazione dello spruzzo viene risolta usando un metodo Monte Carlo. Vengono considerati modelli dettagliati dello scambio di massa, quantità di moto ed energia tra la fase liquida e quella gassosa. I risultati presentati in questo lavoro sono riferiti ad una fiamma aria-ottano, dove piccole quantità di ottano liquido in forma di spruzzo liquido vengono aggiunte ad una miscela di aria e ottano gassosa non bruciata e pura.
    Notes: Abstract In the present paper we model and numerically simulate steady, laminar, premixed spray flames. The gasphase is described in Eulerian form by the equations governing the conservation of overall mass, momentum, energy and species mass. The liquid phase is described in Lagrangian form by the overall continuity equation, which reduces to an equation for the droplet size, the equations of motion, the energy equation and a droplet density function transport equation. The latter is the so-called ‘spray equation’, which, at any position in the chemically reacting flowfield, describes the joint distribution of droplet size, droplet velocity and droplet temperature. Herein the spray equation is solved using a Monte Carlo method. Detailed models of the exchange of mass, momentum and energy between the gaseous and the liquid phase are taken into account. The results presented in this paper are for an octane-air flame, where small amounts of liquid octane in form of a liquid spray are added to a fresh, unburnt gaseous octane-air mixture.
    Type of Medium: Electronic Resource
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