A photographic study of fuel spray ignition in a rapid compression machine

Conference · Wed Jan 01 00:00:00 EST 1986

OSTI ID:5501930

Solomon, A S.P.

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-
• Resource Relation: Conference: Society of Automotive Engineers international congress and exposition, Detroit, MI, USA, 24 Feb 1986
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
AUTOMOTIVE FUELS
COMBUSTION PROPERTIES
HYDROCARBONS
EMISSION
STRATIFIED CHARGE ENGINES
EXHAUST GASES
FUEL INJECTION SYSTEMS
PERFORMANCE TESTING
ANGULAR VELOCITY
COMBUSTION CHAMBERS
ELECTRODES
FLAME PROPAGATION
IGNITION QUALITY
LEADING ABSTRACT
MEETINGS
SIMULATION
SPRAYS
TIME RESOLUTION
TWO-DIMENSIONAL CALCULATIONS
VORTEX FLOW
ABSTRACTS
DOCUMENT TYPES
ENGINES
FLUID FLOW
FLUIDS
FUEL SYSTEMS
FUELS
GASEOUS WASTES
GASES
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
ORGANIC COMPOUNDS
RESOLUTION
TESTING
TIMING PROPERTIES
VELOCITY
WASTES
330100* - Internal Combustion Engines
330800 - Emission Control- Alternative Fuels