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Titre du document / Document title

Modeling of gas turbine fuel nozzle spray

Auteur(s) / Author(s)

RIZK N. K. (1) ; CHIN J. S. (1) ; RAZDAN M. K. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Allison Engine Company, Indianapolis, IN 46206, ETATS-UNIS

Résumé / Abstract

Satisfactory performance of the gas turbine combustor relies on the careful design of various components, particularly the fuel injector. It is, therefore, essential to establish a fundamental basis for fuel injection modeling that involves various atomization processes. A two-dimensional fuel injection model has been formulated to simulate the airflow within and downstream of the atomizer and address the formation and breakup of the liquid sheet formed at the atomizer exit. The sheet breakup under the effects of airblast, fuel pressure, or the combined atomization mode of the air-assist type is considered in the calculation. The model accounts for secondary breakup of drops and the stochastic Lagrangian treatment of spray. The calculation of spray evaporation addresses both droplet heat-up and steady-state mechanisms, and fuel vapor concentration is based on the partial pressure concept. An enhanced evaporation model has been developed that accounts for multicomponent, finite mass diffusivity and conductivity effects, and addresses near-critical evaporation. The present investigation involved predictions of flow and spray characteristics of two distinctively different fuel atomizers under both nonreacting and reacting conditions. The predictions of the continuous phase velocity components and the spray mean drop sizes agree well with the detailed measurements obtained for the two atomizers, which indicates the model accounts for key aspects of atomization. The model also provides insight into ligament formation and breakup at the atomizer exit and the initial drop sizes formed in the atomizer near field region where measurements are difficult to obtain. The calculations of the reacting spray show the fuel-rich region occupied most of the spray volume with two-peak radial gas temperature profiles. The results also provided local concentrations of unburned hydrocarbon (UHC) and carbon monoxide (CO) in atomizer flowfield, information that could support the effort to reduce emission levels of gas turbine combustors.

Revue / Journal Title

Journal of engineering for gas turbines and power    ISSN  0742-4795   CODEN JETPEZ 

Source / Source

Congrès
International Gas Turbine and Aeroengine Congress and Exhibition No40, Houston, Texas , ETATS-UNIS (05/06/1995)
1997, vol. 119, no1, pp. 34-44 (24 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Society of Mechanical Engineers, New York, N, ETATS-UNIS  (1984) (Revue)

Mots-clés anglais / English Keywords

Gas turbines

;

Fuel injection

;

Nozzles

;

Spraying

;

Air flow

;

Air blast

;

Flow velocity

;

Atomization

;

Mots-clés français / French Keywords

Turbine gaz

;

Injection combustible

;

Buse

;

Pulvérisation

;

Ecoulement air

;

Vent haut fourneau

;

Vitesse écoulement

;

Atomisation

;

Mots-clés espagnols / Spanish Keywords

Flujo aéreo

;

Viento alto horno

;

Velocidad flujo

;

Localisation / Location

INIST-CNRS, Cote INIST : 6120 A, 35400006336417.0060

Nº notice refdoc (ud4) : 2598245



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