NDLI: The Effects of Oxygen Enrichment of Combustion Air for Spark-Ignition Engines Using a Thermodynamic Cycle Simulation

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Jerald, A. Caton
Copyright Year	2005
Abstract	A thermodynamic cycle simulation was used to examine the effects of oxygen enriched combustion air on engine performance for a range of operating conditions and for different sized engines. The use of oxygen enriched combustion air will have a direct effect on the combustion process and on the overall engine thermodynamics. For example, for cases with higher inlet oxygen concentration (and hence less nitrogen dilution), for the same operating conditions, the combustion gas temperatures and engine cylinder heat losses will be higher. In addition, the engine using oxygen enriched combustion air will be smaller than an engine using normal air for the same power output. The major objective of this study was to quantify these expectations for a range of operating conditions. One special feature of a portion of the current study is the constant engine power output by decreasing engine size as the oxygen concentration increased in the combustion air. Results include detail thermodynamic results of temperatures, pressures and properties as functions of the oxygen concentration of the combustion air. Results also include engine performance parameters such as power, torque, fuel consumption, thermal efficiency, and exhaust temperatures. For one comparison, engine performance and fuel consumption were obtained for an equivalence ratio of 1.0, MBT spark timing, and 2500 rpm. For oxygen enriched combustion air with 32% oxygen, equal power output was obtained with 73% of the displaced volume (all else the same). For the higher oxygen case, the brake fuel consumption increased about 11% primarily due to higher heat losses and higher exhaust gas energy which were a consequence of the higher gas temperatures. For the MBT spark timing case, the nitric oxide emissions increased by about 11% as the oxygen concentration increases from 21% to 25%.
Sponsorship	Internal Combustion Engine Division
Starting Page	135
Ending Page	147
Page Count	13
File Format	PDF
ISBN	0791841847
DOI	10.1115/ICES2005-1006
e-ISBN	079183753X
Conference Proceedings	ASME 2005 Internal Combustion Engine Division Spring Technical Conference
Language	English
Publisher Date	2005-04-05
Publisher Place	Chicago, Illinois, USA
Access Restriction	Subscribed
Subject Keyword	Oxygen Temperature Torque Spark-ignition engine Heat losses Fuel consumption Combustion Combustion gases Nitrogen Engines Exhaust systems Emissions Thermodynamics Simulation Thermodynamic cycles Thermal efficiency Brakes Engine cylinders
Content Type	Text
Resource Type	Article

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