The influence of bowl offset on air motion in a direct injection diesel engine
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-
- Resource Relation:
- Conference: Society of Automotive Engineers fuels and lubricants meeting and exposition, Portland, OR, USA, 10-13 Oct 1988; Other Information: Technical Paper 881611
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
COMPUTER CODES
DIESEL ENGINES
AIR FLOW
COMPUTERIZED SIMULATION
FLOW MODELS
FUEL INJECTION SYSTEMS
KINETIC ENERGY
TURBULENT FLOW
ENERGY
ENGINES
FLUID FLOW
FUEL SYSTEMS
GAS FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MATHEMATICAL MODELS
SIMULATION
330102* - Internal Combustion Engines- Diesel
990220 - Computers
Computerized Models
& Computer Programs- (1987-1989)