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A Compound Cycle Employing Two-Stage Combustion to Reduce Automotive Air Pollution
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Abstract
This paper presents a compound engine concept that has the potential of significantly reducing exhaust emissions. This cycle is based on a combination of components of the spark-ignition engine and the gas turbine. The cycle utilizes a two-stage combustion process involving fuel-rich combustion at high temperatures to reduce NOx formation and followed by lean burning to eliminate unburned hydrocarbons in a thermodynamically productive manner. A thermodynamic analysis of this cycle and a comparison with the conventional otto cycle is presented. The combustion processes involved are examined and methods of implementing this cycle in a practical manner are shown. The results of this analysis indicate that a practical automotive power cycle with excellent part load and transient response characteristics is possible via this approach.
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Decher, R., Hertzberg, A., and Corlett, R., "A Compound Cycle Employing Two-Stage Combustion to Reduce Automotive Air Pollution," SAE Technical Paper 720736, 1972, https://doi.org/10.4271/720736.Also In
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