Combustion exhaust emissions of the spark-assisted methanol diesel engine
Ignition and combustion of methanol in a spark-assisted methanol diesel engine were studied for the purpose of developing such an engine that is practical for actual vehicles. It became clear through investigations on combustion of methanol in a spark-assisted methanol diesel engine that methanol combustion proceeds mainly by flame propagation. Based on this finding, effects of such parameters as the injection direction, ignition position, ignition energy, compression ratio, injection timing and ignition timing were studied to obtain optimal conditions for methanol combustion. It was found through such studies that it is effective to form the mixture upstream of the spark plug relative to the swirling direction and increase the inductive component of the ignition energy to achieve a high ignition stability. It was also found that it is effective for raising the engine performance and improving exhaust emission characteristics to form the mixture downstream of the spark plug relative to the swirling direction so that the flame propagates along the swirl and to position the spark plug closer to the wall of combustion chamber so that the combustion is accelerated by the thermal mixing effect. The spark-assisted methanol diesel engine thus developed was mounted to a vehicle. The vehicle demonstrated superior fuel economy with very low levels of exhaust emissions.
- Research Organization:
- Japan Automobile Research Inst., Inc. (JARI)
- OSTI ID:
- 7140670
- Report Number(s):
- CONF-8609165-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
33 ADVANCED PROPULSION SYSTEMS
330101 -- Internal Combustion Engines-- Spark-Ignition
330102* -- Internal Combustion Engines-- Diesel
330800 -- Emission Control-- Alternative Fuels
AIR POLLUTION ABATEMENT
ALCOHOL FUELS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION CONTROL
COMBUSTION KINETICS
COMBUSTION PRODUCTS
COMPRESSION RATIO
CONTROL
DIESEL ENGINES
DIESEL FUELS
ENGINES
EXHAUST GASES
FLAME PROPAGATION
FLUID FLOW
FLUIDS
FUEL ECONOMY
FUEL SUBSTITUTION
FUELS
GASEOUS WASTES
GASES
HEAT ENGINES
IGNITION
IGNITION SYSTEMS
INTERNAL COMBUSTION ENGINES
KINETICS
METHANOL FUELS
OXIDATION
PERFORMANCE
PETROLEUM PRODUCTS
POLLUTION ABATEMENT
REACTION KINETICS
SPARK IGNITION ENGINES
SYNTHETIC FUELS
THERMOCHEMICAL PROCESSES
TIMING PROPERTIES
VEHICLES
VORTEX FLOW
WASTES