What causes slower flame propagation in the lean-combustion engine
Journal Article
·
· Journal of Engineering for Gas Turbines and Power; (United States)
- Engine Research Dept., General Motors Research Lab., Warren, MI (US)
Previous engine data suggest that slower flame propagation in lean-burn engines could be due to slower flame expansion velocity at lean conditions than at stoichiometric combustion. This paper reports on two classes of model, a quasi-dimensional engine-simulation program and a multidimensional engine-flow and combustion code, used to study this effect in detail and to assess the capabilities of the models to resolve combustion details. The computed flame-speed data from each program differed somewhat in magnitude, but the predicted trends at various equivalence ratios were quite similar. The trends include: (1) The peak in-cylinder burned-gas temperature decreases by about 300 K as the equivalence ratio is decreased from 0.98 to 0.70. (2) Both the laminar flame speed and the flame-propagation speed, the latter computed from the time derivative of flame radius, decrease with decreasing equivalence ratio.
- OSTI ID:
- 5662006
- Journal Information:
- Journal of Engineering for Gas Turbines and Power; (United States), Journal Name: Journal of Engineering for Gas Turbines and Power; (United States) Vol. 112:3; ISSN JETPE; ISSN 0742-4795
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
33 ADVANCED PROPULSION SYSTEMS
330101* -- Internal Combustion Engines-- Spark-Ignition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
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42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMPUTER CODES
DATA
ENGINES
EXPANSION
EXPERIMENTAL DATA
FLAME PROPAGATION
FLAMES
FLUID FLOW
HEAT ENGINES
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INTERNAL COMBUSTION ENGINES
KINETICS
LAMINAR FLOW
MANY-DIMENSIONAL CALCULATIONS
NUMERICAL DATA
REACTION KINETICS
SPARK IGNITION ENGINES
THERMAL EXPANSION
TURBULENT FLOW
VELOCITY
330101* -- Internal Combustion Engines-- Spark-Ignition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMPUTER CODES
DATA
ENGINES
EXPANSION
EXPERIMENTAL DATA
FLAME PROPAGATION
FLAMES
FLUID FLOW
HEAT ENGINES
INFORMATION
INTERNAL COMBUSTION ENGINES
KINETICS
LAMINAR FLOW
MANY-DIMENSIONAL CALCULATIONS
NUMERICAL DATA
REACTION KINETICS
SPARK IGNITION ENGINES
THERMAL EXPANSION
TURBULENT FLOW
VELOCITY