Ignition delay and heat release analysis of an ethanol fumigated turbocharged diesel engine
A turbocharged, open chamber diesel engine was fumigated with prevaporized ethanol and run over its speed and load range. The mass percentage of ethanol was varied from zero to 80% at light load and zero to 50% at full load. Digitized cylinder pressure data were cycle averaged and used to examine ignition delay and to calculate heat release patterns and NO production. It is shown that the ignition delay is increased by the thermodynamic effects of fumigation, but it can be decreased by chemical effects of alcohol reactions if the cylinder gas temperature is above approximately 900 K (1600/sup 0/R). The heat release model uses three zones; a diesel fuel-ethanol zone, an air-ethanol zone and a products zone. The mode predicts that fumigation causes a large increase in the initial burning spike even when the fumigation decreases the ignition delay. Fumigation decreases combustion duration slightly at heavy load but greatly increases the duration at light loads. Values of NO concentration computed from the product zone properties and Zeldovich kinetics predict the observed exhaust NO trends, but are about twice too high in value.
- Research Organization:
- Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706
- DOE Contract Number:
- AC02-79CS50025
- OSTI ID:
- 5440581
- Journal Information:
- Am. Soc. Mech. Eng., (Pap.); (United States), Journal Name: Am. Soc. Mech. Eng., (Pap.); (United States) Vol. 83-DGP-1; ISSN ASMSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
10 SYNTHETIC FUELS
33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
330800 -- Emission Control-- Alternative Fuels
ALCOHOLS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COMBUSTION
COMBUSTION KINETICS
DIESEL ENGINES
DIESEL FUELS
DISPERSIONS
ENERGY TRANSFER
ENGINES
ETHANOL
EVAPORATION
FUEL FEEDING SYSTEMS
FUEL SUBSTITUTION
FUEL SYSTEMS
HEAT ENGINES
HEAT TRANSFER
HYDROXY COMPOUNDS
IGNITION
INTERNAL COMBUSTION ENGINES
KINETICS
MIXTURES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE
PETROLEUM PRODUCTS
PHASE TRANSFORMATIONS
REACTION KINETICS
SIMULATION
TEMPERATURE DEPENDENCE
THERMOCHEMICAL PROCESSES