In-cylinder velocity field measurements in a motored diesel engine

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6373487

Cipolla, G; Puglisi, A; Vafidis, C

Measurements of three velocity components and of the corresponding turbulent fluctuations are reported obtained by laser Doppler anemometry in the cylinder of a FIAT-IVECO 8140 DI Diesel engine motored at 1000 rpm with a 16:1 compression ratio. The results show that the air swirl velocities at inlet valve closure are axially stratified while the intake-generated axial flow structures persist, although decaying, up to 70/sup 0/ BTDC when the squish effect transforms the in-cylinder flow structure. The presence of a flow towards the piston crevice is detected at 20/sup 0/ BTDC while at TDC of compression the formation of, at least, one toroidal vortex in the axial plane inside the piston bowl is detected. The findings of this investigation are compared with similar measurements in simplified engine configurations and reveal a satisfactory qualitative as well as quantitative agreement.

• Research Organization: Centro Ricerche Fiat, Orbassano (Torino)
• OSTI ID: 6373487
• Report Number(s): CONF-870204-
• Resource Relation: Conference: Society of Automotive Engineers international congress and expo, Detroit, MI, USA, 23 Feb 1987; Other Information: 870373
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
DIESEL ENGINES
AIR FLOW
HYDRAULICS
VELOCITY
ANEMOMETERS
COMPRESSION RATIO
CYLINDERS
DOPPLER EFFECT
FLOW RATE
LASERS
OPERATION
PISTONS
TURBULENT FLOW
ENGINES
FLUID FLOW
FLUID MECHANICS
GAS FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
MECHANICS
330102* - Internal Combustion Engines- Diesel