A photographic study of fuel spray ignition in a rapid compression machine
The process of spark ignition of fuel sprays in a rapid compression machine was analyzed using high-speed schlieren photography and pressure-time data. The combustion chamber studied simulates in a two-dimensional sense the three-dimensional arrangement of the piston bowl, injector and spark plug in a typical direct-injection stratified-charge (DISC) engine. The test hardware included a flat-seat straight-hole injector, a high-energy ignition system and an extended-electrode spark plug. The influence of amount of fuel injected, ignition dwell period (time between start of injection and start of ignition), swirl rate and direction, and spark-plug electrode-tip location on the ignition process was examined. For the test conditions studied, excessive spray penetration and fuel impingement on the walls was observed. The ignition process was observed to be governed by the delayed formation, growth and transport of a flame kernel which spreads to complete the major portion of the burn only after the injection process has been completed. The factors found to influence the evolution of the flame kernel could be possible mechanisms for the high cyclic variability and high hydrocarbon emissions observed for DISC engines of the type simulated.
- OSTI ID:
- 5501930
- Report Number(s):
- CONF-860263-
- Country of Publication:
- United States
- Language:
- English
Similar Records
The role of spray-enhanced swirl flow for combustion stabilization in a stratified-charge DISI engine
CFD-Guided Evaluation of Spark-Assisted Gasoline Compression Ignition for Cold Idle Operation
Related Subjects
330100* -- Internal Combustion Engines
330800 -- Emission Control-- Alternative Fuels
ABSTRACTS
ANGULAR VELOCITY
AUTOMOTIVE FUELS
COMBUSTION CHAMBERS
COMBUSTION PROPERTIES
DOCUMENT TYPES
ELECTRODES
EMISSION
ENGINES
EXHAUST GASES
FLAME PROPAGATION
FLUID FLOW
FLUIDS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
FUELS
GASEOUS WASTES
GASES
HEAT ENGINES
HYDROCARBONS
IGNITION QUALITY
INTERNAL COMBUSTION ENGINES
LEADING ABSTRACT
MEETINGS
ORGANIC COMPOUNDS
PERFORMANCE TESTING
RESOLUTION
SIMULATION
SPRAYS
STRATIFIED CHARGE ENGINES
TESTING
TIME RESOLUTION
TIMING PROPERTIES
TWO-DIMENSIONAL CALCULATIONS
VELOCITY
VORTEX FLOW
WASTES