Cycle-resolved velocity and turbulence measurements in an IC engine with combustion

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5731366

Hall, M J; Bracco, F V; Santavicca, D A

Laser Doppler velocimetry has been used to make cycle-resolved velocity and turbulence measurements in a homogeneous-charge, spark-ignition engine. The engine had a ported intake and disc-shaped chamber with a compression ratio of 8 to 1. It was operated at a speed of 1200 rpm and with a TDC swirl number of 4. A stoichiometric propane-air mixture was used, and ignition was near the wall. The velocity measurements were made at three spatial locations at the midpoint of the clearance height. Tests were made to determine whether the presence of the flame affected the accuracy of the velocity measurements. It was found that the ensemble-averaged mean velocity shows a small deviation, and the rms fluctuation intensity is significantly influenced, but the effects appear to be confined to the flame zone. Data rates were sufficiently high in the preflame and postflame regions to determine the velocity history in each cycle (cycle resolved). The cycle resolved turbulence intensity was found to increase across the flame. The turbulence intensity in the burned gas was found to be homogeneous at the three spatial locations examined and to decay rapidly. There was little or no increase in turbulence intensity ahead of the flame.

• Research Organization: Princeton Univ.
• OSTI ID: 5731366
• Report Number(s): CONF-860263-
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
034000 -- Natural Gas-- Combustion
33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
330800 -- Emission Control-- Alternative Fuels
ABSTRACTS
ACCURACY
AIR
ALKANES
COMBUSTION CHAMBERS
COMBUSTION PROPERTIES
COMPRESSION RATIO
DATA ACQUISITION
DISPERSIONS
DOCUMENT TYPES
DOPPLER EFFECT
ENGINES
FLAME PROPAGATION
FLUCTUATIONS
FLUID FLOW
FLUIDS
FUEL-AIR RATIO
GAS FLOW
GASES
HEAT ENGINES
HYDROCARBONS
IGNITION
INTERNAL COMBUSTION ENGINES
LASERS
LEADING ABSTRACT
MEASURING INSTRUMENTS
MEETINGS
MIXTURES
ORGANIC COMPOUNDS
PERFORMANCE TESTING
PROPANE
SPACE DEPENDENCE
SPARK IGNITION ENGINES
STOICHIOMETRY
TESTING
TURBULENT FLOW
VARIATIONS
VELOCIMETERS
VELOCITY