Observation of flow characteristics in a model I. C. engine cylinder

Conference · Wed Feb 01 04:00:00 EST 1978

OSTI ID:6737080

Ishikawa, N; Daily, J W

A study of fluid mechanical effects on unburned hydrocarbon generation was made in a single compression expansion model automobile engine. Full optical access allowed the color Schlieren observations of various gas motion alongside the engine cylinder. Motion pictures of the gas motion and flame propagation were taken at a rate of seven thousand frames per second for the following cases: (1) intake stroke; (2) exhaust stroke; and (3) compression power stroke with combustion and blow-down with appropriate exhaust valve opening. Unburned fuel concentrations were measured by means of a gas chromatograph. The results show that turbulent motion of the mixture increases the amount of unburned fuel. It is implied that the rolled-up vortices play an important role on wall flame quenching processes in an engine.

• Research Organization: California Univ., Berkeley (USA). Lawrence Berkeley Lab.
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6737080
• Report Number(s): LBL-6894; CONF-780208-4
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
330704 -- Emission Control-- Hydrocarbons
AUTOMOBILES
ENGINES
FLAME PROPAGATION
FLUID FLOW
FLUID MECHANICS
FUNCTIONAL MODELS
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
MECHANICS
ORGANIC COMPOUNDS
PHOTOGRAPHY
SCHLIEREN METHOD
SPARK IGNITION ENGINES
TESTING
TURBULENT FLOW
VEHICLES
VORTICES