Transient spray-combustion computations. Report for October 1985-October 1986

Technical Report · Mon Sep 01 04:00:00 EDT 1986

OSTI ID:6084099

Sirignano, W A

Many practical combustion devices involves direct injection of liquid fuel into the combustion chamber, e.g., gas-turbine engines, diesel engines, rockets and ramjet engines, and furnaces. Typically, the fuel is of sufficiently low volatility that vaporization is an important or controlling factor in the rate of combustion. It is desirable, therefore, to analyze the trajectories, heating, and vaporization of the large number of droplets in a fuel spray and to account for the exchange of mass, momentum, and energy between the liquid and gas phases in order to predict combustor performance, stability, and pollutant emission. A review is made of one-dimensional, unsteady and axisymmetric, unsteady spray-combustion calculations. Proper formulation of the governing two-phase equations are discussed. Problems of ignition and flame propagation are examined. Since droplet lifetime is of the same order to magnitude as time for heat transport through the droplet, transient heating of the droplets is considered together with effects of internal droplet circulation due to shear forces on the droplet surface.

• Research Organization: California Univ., Irvine (USA). Dept. of Mechanical Engineering
• OSTI ID: 6084099
• Report Number(s): AD-A-181726/1/XAB
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION CHAMBERS
DIESEL ENGINES
DRAG
DROPLETS
EMISSION
ENERGY TRANSFER
ENGINES
EQUATIONS
FLAME PROPAGATION
FLUIDS
FUELS
FURNACES
GAS TURBINE ENGINES
GASES
HEAT ENGINES
HEAT TRANSFER
HEATING
IGNITION
INTERNAL COMBUSTION ENGINES
LIQUID FUELS
MASS
OXIDATION
PARTICLES
POLLUTANTS
RAMJET ENGINES
ROCKETS
SPRAYS
SURFACES
THERMOCHEMICAL PROCESSES
TRAJECTORIES
TRANSIENTS
VOLATILITY