Combustion optimization studies for stratified charge and diesel engines. Progress report, October 1, 1977--September 30, 1978
The objectives of the program are to assess the feasibility and operating characteristics of the following high compression, spark ignition (or self ignition), stratified charge (or diesel) engine configuration: compression ratio: 16; open chember; direct fuel injection; unthrottled operation; 615 cc/cylinder; explored speed range 1000 to 4000 rpm (expected practical range 600 to 6000 rpm); fuels: ethanol-diesel mixtures; spark ignition (stratified charge) or self ignition (diesel), to continue the development and the testing of physical and numerical aspects of multi-dimensional combustion models in order to assess and improve their accuracy and to reduce their computation time, and to contribute to the achievement of a more fundamental and detailed understanding, characterization, and command of the processes wich control efficiency and emissions in internal combustion engines. Progress to date includes: engine modifications to obtain a transparent-piston, transparent-head configuration have been implemented; a gaseous fuel injection system has been designed, built, and operated; shadowgraph records of engine combustion have been obtained; a LDV system for in-cylinder gas velocity measurements has been selected; progress has been made toward measuring in-cylinder pressure, temperature, and composition for complete characterization of the charge; modeling of unsteady gaseous jets has yielded results which match asymptotically known steady state solutions; comparison with unsteady, two-dimensional bomb flames has yielded general scaling procedures for the computation of laminar flames; studies toward modeling of thick sprays have continued; DISC and other technical meetings have been attended and the results of the program made known to researchers and automotive industries; a very promising technique to apply television to unsteady events with short characteristic time (< 30 ms) has been developed and applied to obtain records of engine flames.
- Research Organization:
- Princeton Univ., NJ (United States)
- DOE Contract Number:
- EC-77-S-02-4191
- OSTI ID:
- 6520043
- Report Number(s):
- COO-4191-1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DIESEL ENGINES
PERFORMANCE
RESEARCH PROGRAMS
SPARK IGNITION ENGINES
STRATIFIED CHARGE ENGINES
AIR POLLUTION CONTROL
COMBUSTION KINETICS
FEASIBILITY STUDIES
FUEL INJECTION SYSTEMS
INTERNAL COMBUSTION ENGINES
OPTIMIZATION
CHEMICAL REACTION KINETICS
ENGINES
FUEL SYSTEMS
KINETICS
POLLUTION CONTROL
REACTION KINETICS
330100* - Internal Combustion Engines