Performance and knock limits of ethanol-gasoline blends in spark-ignited engines
Ethanol-gasoline blends have been investigated as a spark-ignition engine fuel. The work was carried out on a Ricardo E6 variable compression engine in which all the significant operating parameters can be varied and accurately measured including onset of knock. Various blends were used (10 to 70% ethanol by volume) and the effects of mixture strength, ignition timing and speed on the highest useful compression ratio were accurately defined. Borderline road test data were evaluated using information on reference fuels and the required performance of the automatic spark advance mechanism was deduced. The results revealed that higher concentration of ethanol in the blend greatly enhances knock resistance. A blend of 50% gasoline and 50% ethanol produced the highest output in both the rich and lean mixture regions. The performance of the automatic spark advance mechanism was found to vary considerably with various blends and mixture strengths. The sensitivity of optimum power attainment to ignition timing and mixture strength was illustrated. Also the saving in mechanical octanes was put forward.
- OSTI ID:
- 5687745
- Report Number(s):
- TP-850213
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
10 SYNTHETIC FUELS
GASOHOL
ANTIKNOCK RATINGS
PERFORMANCE TESTING
SPARK IGNITION ENGINES
FUEL SUBSTITUTION
KNOCK CONTROL
COMPRESSION RATIO
ETHANOL FUELS
GASOLINE
IGNITION QUALITY
MIXTURES
OCTANE
PARAMETRIC ANALYSIS
QUANTITY RATIO
ROAD TESTS
SENSITIVITY ANALYSIS
VELOCITY
ALCOHOL FUELS
ALKANES
CONTROL
DISPERSIONS
ENGINES
FUELS
HEAT ENGINES
HYDROCARBONS
INTERNAL COMBUSTION ENGINES
LIQUID FUELS
ORGANIC COMPOUNDS
PETROLEUM PRODUCTS
SYNTHETIC FUELS
TESTING
330101* - Internal Combustion Engines- Spark-Ignition
330800 - Emission Control- Alternative Fuels
025000 - Petroleum- Combustion
090210 - Alcohol Fuels- Properties- (1976-1989)