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. 18 references, 12 figures.
- Research Organization:
- Sandia National Labs., Livermore, CA
- OSTI ID:
- 5637248
- Journal Information:
- Soc. Auto. Eng. Tech. Pap. Ser.; (United States), Journal Name: Soc. Auto. Eng. Tech. Pap. Ser.; (United States) Vol. 831697; ISSN SAESD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330101* -- Internal Combustion Engines-- Spark-Ignition
AUTOMOTIVE FUELS
CHEMICAL REACTIONS
COMBUSTION
ENGINES
FLAME PROPAGATION
FLUID FLOW
FUELS
HEAT ENGINES
INTERNAL COMBUSTION ENGINES
MEASURING INSTRUMENTS
OXIDATION
SPARK IGNITION ENGINES
THERMOCHEMICAL PROCESSES
TURBULENCE
VELOCIMETERS