A study of velocities and turbulence intensities measured in firing and motored engines

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:6513570

Hall, M J; Bracco, F V

Laser Doppler velocimetry was used to make cycle-resolved velocity and turbulence measurements under motoring and firing conditions in a ported homogeneous charge S.I. engine. The engine had a flat pancake chamber with a compression ratio of 7.5. In one study, the effect of the intake velocity on TDC turbulence intensity was measured at 600, 1200, and 1800 rpm with three different intake flow rates at each speed. The TDC swirl ratio ranged from 2 to 6. The TDC turbulence intensities were found to be relatively insensitive to the intake velocity, and tended to scale more strongly with engine speed. For the combustion measurements, the engine was operated at 600, 1200, and 2400 rpm on stoichiometric and lean propane-air mixtures. Velocity measurements were made in swirling and non-swirling flows at several spatial locations on the midplane of the clearance height.

• Research Organization: Princeton Univ.
• OSTI ID: 6513570
• Report Number(s): CONF-870204-
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
BOUNDARY LAYERS
CHEMICAL REACTION KINETICS
COMBUSTION CHAMBERS
COMBUSTION KINETICS
COMPRESSION RATIO
ENGINES
FLAMES
FLOW RATE
FLUID FLOW
FLUID MECHANICS
FUEL INJECTION SYSTEMS
FUEL SYSTEMS
HEAT ENGINES
HYDRAULICS
IGNITION
INTERNAL COMBUSTION ENGINES
KINETICS
LAYERS
MEASURING INSTRUMENTS
MECHANICS
METERING
MONITORING
OPERATION
REACTION KINETICS
SPARK IGNITION ENGINES
TURBULENCE
VELOCIMETERS
VELOCITY
VORTEX FLOW