Three dimensional numerical modeling of liquid fuel sprays

Conference · Thu Jan 01 04:00:00 EST 1976

OSTI ID:7338123

Westbrook, C K

A numerical solution technique was developed for the spray equation and applied to thin sprays injected into a type of stratified charge internal combustion chamber. The difference equation method can treat general three dimensional geometries, using a statistical approach. The effects of independent variations of a large number of system parameters were studied, including initial spray dispersion, amount and type of gas swirl, gas density, injection timing, chamber geometry, initial droplet size distribution, injection velocity, drag coefficient, vaporization rate expression, injector aperture size, droplet specific gravity, and direction of injection. It was found that, in the particular geometry chosen, the gas swirl, the droplet size distribution produced by the injector, and the chamber gas density into which the spray is injected are the most important factors influencing the spray motion and vaporization. Although the calculations reported applied to internal combustion engine conditions, the general method is applicable to other spray-injected combustors, including stationary combustors and rocket motors. Results from calculations indicate that the technique, used in coordination with selected laboratory measurements, could significantly enhance spray-injected combustor design efforts.

• Research Organization: California Univ., Livermore (USA). Lawrence Livermore Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 7338123
• Report Number(s): UCRL-77621(Rev.1); CONF-760801-3
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
COMBUSTION CHAMBERS
DROPLETS
ENGINES
EVAPORATION
FLUID FLOW
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
GAS FLOW
INTERNAL COMBUSTION ENGINES
MATHEMATICAL MODELS
MATHEMATICS
NUMERICAL SOLUTION
PARTICLES
PHASE TRANSFORMATIONS
SPRAYS
STATISTICS
STRATIFIED CHARGE ENGINES
THREE-DIMENSIONAL CALCULATIONS