Measurements and predictions of the precombustion fluid motion and combustion rates in a spark ignition engine
Laser Doppler velocimeter results are presented for the mean velocity and turbulence intensity measured in a motored research engine. The compression of complex bulk motions created during induction produces turbulence as the piston approaches top dead center. The turbulence field is shown to be isotropic but nonhomogeneous. A zero-dimensional computer simulation based on an averaged k-EPSILON model is shown to adequately predict the decay of turbulence at a point in the flow after the production phase is completed. Cylinder pressure measurements were recorded for homogeneous stoichiometric combustion for a range of engine speeds and ignition locations. A two-zone (burned and unburned gases) thermodynamic model accurately predicts the measured pressure histories when the turbulence results determined from the motored tests are used to establish initial conditions for the combustion model.
- Research Organization:
- Sandia National Laboratories, Livermore, CA
- OSTI ID:
- 6795546
- Report Number(s):
- CONF-8310223-
- Journal Information:
- SAE Prepr.; (United States), Journal Name: SAE Prepr.; (United States) Vol. SAE-831697; ISSN SEPPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330101* -- Internal Combustion Engines-- Spark-Ignition
CHEMICAL REACTIONS
COMBUSTION
COMPRESSIBLE FLOW
COMPRESSION
COMPUTERIZED SIMULATION
CYLINDERS
DOPPLER EFFECT
ENGINES
FLOW MODELS
FLUID FLOW
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
ISOTROPY
MATHEMATICAL MODELS
OXIDATION
PISTONS
PRESSURE MEASUREMENT
SIMULATION
SPARK IGNITION ENGINES
STOICHIOMETRY
THERMOCHEMICAL PROCESSES
THERMODYNAMICS
TURBULENT FLOW
VELOCITY