An experimental and computational evaluation of two dual-intake-valve combustion chambers
This paper reports on multi-dimensional computations that wle made of spark-ignited premixed-charge combustion in two engines having pent-roof-shaped combustion chambers and two intake valves per cylinder, one with a central spark plug and the other with dual lateral spark plugs. The basic specifications for the two engines were the same except for differences in the number of spark plugs and exhaust valves. The effects of swirl and equivalence ratio on combustion, wall heat transfer, and nitric oxide emission characteristics were examined using a global combustion model that accounts for laminar-kinetics and turbulent-mixing effects. The initial conditions on both mean-flow and turbulence parameters at intake valve closing (IVC) were estimated in order to simulate engine operation either with both intake valves active or with one valve deactivated. The predictions were compared with experimentally derived pressure-time, heat loss, and nitric oxide emission data. The model, consistent with experimental data, indicates that the dual lateral ignition engine responds more favorably to valve deactivation as charge dilution is increased, and shows flame convection to be the source of the dual lateral ignition engine's superior that when the effects of flame convection are considered, the model predicted top dead center (TDC) turbulence intensities are in good agreement with experimentally derived apparent TDC turbulence intensities for both engines with the without valve deactivation.
- OSTI ID:
- 5880283
- Report Number(s):
- CONF-9010205--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330101 -- Internal Combustion Engines-- Spark-Ignition
330603 -- Vehicle Design Factors-- Engine System
330700* -- Advanced Propulsion Systems-- Emission Control
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
AIR POLLUTION CONTROL
CHALCOGENIDES
COMPARATIVE EVALUATIONS
COMPUTER CALCULATIONS
CONTROL
CONTROL EQUIPMENT
CONVECTION
DATA
DUAL-FUEL ENGINES
ENERGY TRANSFER
ENGINES
EQUIPMENT
EVALUATION
EXHAUST SYSTEMS
EXPERIMENTAL DATA
FLAMES
FLOW MODELS
FLOW REGULATORS
FLUID FLOW
HEAT ENGINES
HEAT TRANSFER
INFORMATION
INTERNAL COMBUSTION ENGINES
LAMINAR FLOW
MASS TRANSFER
MATHEMATICAL MODELS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PERFORMANCE TESTING
POLLUTION CONTROL
SPARK IGNITION ENGINES
SPECIFICATIONS
TESTING
TURBULENT FLOW
VALVES