Stochastic model of turbulent mixing with chemical reaction: combustion period of an internal combustion engine

Thesis/Dissertation · Fri Jan 01 04:00:00 EST 1982

OSTI ID:6063915

Milane, R E

A model for predicting the burn rate of a premixed and stratified internal combustion engine is developed. The burn rate model is composed of the ignition period dominated by molecular and turbulent diffusion and the combustion period dominated by turbulent diffusion. A correlation for the ignition period based on a deterministic model for the structure of turbulence is used; this correlation uses turbulent characteristics and the laminar flame speed. A statistical model employing a Monte Carlo technique to follow the mixing process is developed to describe the combustion period; the mixing process is based on turbulent characteristics. The model is used to predict the effects of varying the spark advance, adding exhaust gas recirculation, and the variable stroke of a non-swirling premixed engine; the effects of stratification are explored. The model predictions of the burn rate show the correct trend for variation in spark advance, for adding exhaust gas recirculation, and the variable stroke engine. With increased mixture stratification, the model predicts a reduction in available work. The trends in the model predictions are verified by experimental data. Effects of spark advance, exhaust gas recirculation, and variable stroke engine for a premixed charge are presented.

• OSTI ID: 6063915
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
AUTOMOTIVE FUELS
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
ENGINES
FLAME PROPAGATION
FLUID FLOW
FUELS
HEAT ENGINES
IGNITION
INTERNAL COMBUSTION ENGINES
KINETICS
MATHEMATICAL MODELS
REACTION KINETICS
SPARK IGNITION ENGINES
STOCHASTIC PROCESSES
TURBULENT FLOW