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Optimization of Natural Gas Combustion in Spark-Ignited Engines Through Manipulation of Intake-Flow Configuration
ISSN: 0148-7191, e-ISSN: 2688-3627
Published June 19, 2000 by SAE International in United States
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An investigation was performed to try to quantify the relative importance of large-scale mixing and turbulence in a multi-valve spark-ignited automotive engine converted to use natural gas fuel. The role of mixing was examined by comparing single-point versus multi-point combustion performance at several operating conditions. The fuel-air mixture passed through a static mixer prior to entering the intake manifold in the single point case. This configuration was assumed to produce a well-mixed charge entering the combustion chamber. The fuel was delivered just upstream of the intake port in the multi-point configuration. The charge was assumed to be stratified in this case. The results showed a significant degradation in combustion stability and maximum power but little difference in ignition delay and fully-developed burn duration using multi-point injection.
The relative role of turbulence was examined by altering the intake-flow configuration to create three levels of inlet swirl. A thermodynamic model was used to characterize the effect of the altered flow on mean flow and turbulence. The engine was then tested using each intake-flow configuration. Inlet swirl typically improved combustion stability and decreased fully-developed burn duration, but consistently increased ignition delay. The differences were generally most dramatic at lower engine speeds.
CitationPuzinauskas, P., Willson, B., and Evans, K., "Optimization of Natural Gas Combustion in Spark-Ignited Engines Through Manipulation of Intake-Flow Configuration," SAE Technical Paper 2000-01-1948, 2000, https://doi.org/10.4271/2000-01-1948.
SAE 2000 Transactions Journal of Fuels and Lubricants
Number: V109-4; Published: 2001-09-15
Number: V109-4; Published: 2001-09-15
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