The influence of bowl offset on air motion in a direct injection diesel engine
Conference
·
OSTI ID:5892950
The influence of bowl offset on motored mean flow and turbulence in a direct injection diesel engine has been examined with the aid of a multi-dimensional flow code. Results are presented for three piston geometries. The bowl geometry of each piston was the same, while the offset between the bowl and the cylinder axis was varied from 0.0 to 9.6% of the bore. The swirl ratio at intake valve closing was also varied from 2.60 to 4.27. It was found that the angular momentum of the air at TDC was decreased by less than 8% when the bowl was offset. Nevertheless, the mean (squish and swirl) flows were strongly affected by the offset. In addition, the distribution of turbulent kinetic energy (predicted by the /delta/-e model) was modified. Moderate increases (10% or less) in mass averaged turbulence intensity at TDC with offset were observed.
- OSTI ID:
- 5892950
- Report Number(s):
- CONF-8810120-
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
330102* -- Internal Combustion Engines-- Diesel
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
AIR FLOW
COMPUTER CODES
COMPUTERIZED SIMULATION
DIESEL ENGINES
ENERGY
ENGINES
FLOW MODELS
FLUID FLOW
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
GAS FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KINETIC ENERGY
MATHEMATICAL MODELS
SIMULATION
TURBULENT FLOW
330102* -- Internal Combustion Engines-- Diesel
99 GENERAL AND MISCELLANEOUS
990220 -- Computers
Computerized Models
& Computer Programs-- (1987-1989)
AIR FLOW
COMPUTER CODES
COMPUTERIZED SIMULATION
DIESEL ENGINES
ENERGY
ENGINES
FLOW MODELS
FLUID FLOW
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
GAS FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
KINETIC ENERGY
MATHEMATICAL MODELS
SIMULATION
TURBULENT FLOW