Abnormal combustion in a two-stroke spark ignited methanol engine
Conference
·
OSTI ID:6447934
Methanol (90% methanol + 10% gasoline) when used as a fuel in a 2-stroke spark ignition (SI) engine gave rise to abnormal combustion even at a low compression ratio. The regime of engine operation in which abnormal combustion occurs was identified and the effects of engine parameters such as mixture strength, compression ratio, ignition timing, combustion chamber geometry etc. were studied. Analysis of pressure-time histories of engine cycles when abnormal combustion occurred revealed that abnormal combustion at higher loads is similar to knocking in four-stroke engines. At light loads the nature of abnormal combustion was different. The CFR octane rating of methanol does not correlate with actual anit-knock quality in two-stroke engine combustion. Comparison with primary reference fuels indicated that the two-stroke engine has a very high severity. The hot residual gases seem to have a major role on onset of abnormal combustion.
- OSTI ID:
- 6447934
- Report Number(s):
- CONF-880241-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
090210 -- Alcohol Fuels-- Properties-- (1976-1989)
10 SYNTHETIC FUELS
33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
ALCOHOLS
ANTIKNOCK RATINGS
AUTOMOTIVE FUELS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION KINETICS
COMPRESSION RATIO
ENGINES
FUEL SUBSTITUTION
FUEL-AIR RATIO
FUELS
GASOLINE
HEAT ENGINES
HYDROXY COMPOUNDS
INTERNAL COMBUSTION ENGINES
KINETICS
LIQUID FUELS
METHANOL
ORGANIC COMPOUNDS
OXIDATION
PETROLEUM PRODUCTS
REACTION KINETICS
SPARK IGNITION ENGINES
THERMOCHEMICAL PROCESSES
10 SYNTHETIC FUELS
33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
ALCOHOLS
ANTIKNOCK RATINGS
AUTOMOTIVE FUELS
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION KINETICS
COMPRESSION RATIO
ENGINES
FUEL SUBSTITUTION
FUEL-AIR RATIO
FUELS
GASOLINE
HEAT ENGINES
HYDROXY COMPOUNDS
INTERNAL COMBUSTION ENGINES
KINETICS
LIQUID FUELS
METHANOL
ORGANIC COMPOUNDS
OXIDATION
PETROLEUM PRODUCTS
REACTION KINETICS
SPARK IGNITION ENGINES
THERMOCHEMICAL PROCESSES