Evaluation of a hybrid kinetics/mixing-controlled combustion model for turbulent premixed and diffusion combustion using KIVA-2
Two dimensional calculations were made of spark ignited premixed-charge combustion and direct injection stratified-charge combustion in gasoline fueled piston engines. Results are obtained using kinetic-controlled combustion submodel governed by a four-step global chemical reaction or a hybrid laminar kinetics/mixing-controlled combustion submodel that accounts for laminar kinetics and turbulent mixing effects. The numerical solutions are obtained by using KIVA-2 computer code which uses a kinetic-controlled combustion submodel governed by a four-step global chemical reaction (i.e., it assumes that the mixing time is smaller than the chemistry). A hybrid laminar/mixing-controlled combustion submodel was implemented into KIVA-2. In this model, chemical species approach their thermodynamics equilibrium with a rate that is a combination of the turbulent-mixing time and the chemical-kinetics time. The combination is formed in such a way that the longer of the two times has more influence on the conversion rate and the energy release. An additional element of the model is that the laminar-flame kinetics strongly influence the early flame development following ignition.
- Research Organization:
- National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
- OSTI ID:
- 6278833
- Report Number(s):
- N-90-28792; NASA-TM-103196; E-5590; NAS-1.15:103196; AIAA-90-2450; CONF-900720-
- Resource Relation:
- Conference: 26. AIAA/SAE/ASME/ASEE joint propulsion conference and exhibit, Orlando, FL (USA), 16-18 Jul 1990
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
COMBUSTION KINETICS
K CODES
GASOLINE
FLOW MODELS
IGNITION
MATHEMATICAL MODELS
MIXING
CHEMICAL REACTION KINETICS
COMPUTER CODES
FUELS
KINETICS
LIQUID FUELS
PETROLEUM PRODUCTS
REACTION KINETICS
400800* - Combustion
Pyrolysis
& High-Temperature Chemistry