This paper presents a detailed exergy analysis of homogeneous charge compression ignition (HCCI) engines, including a crank-angle resolved breakdown of mixture exergy and exergy destruction. Exergy analysis is applied to a multi-zone HCCI simulation including detailed chemical kinetics. The HCCI simulation is validated against engine experiments for ethanol-fueled operation. The exergy analysis quantifies the relative importance of different loss mechanisms within HCCI engines over a range of engine operating conditions. Specifically, four loss mechanisms are studied for their relative impact on exergy losses, including 1) the irreversible combustion process (16.4–21.5%), 2) physical exergy lost to exhaust gases (12.0–18.7%), 3) heat losses (3.9–17.1%), and 4) chemical exergy lost to incomplete combustion (4.7–37.8%). The trends in each loss mechanism are studied in relation to changes in intake pressure, equivalence ratio, and engine speed as these parameters are directly used to vary engine power output. This exergy analysis methodology is proposed as a tool to inform research and design processes, particularly by identifying the relative importance of each loss mechanism in determining engine operating efficiency.
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ASME 2012 Internal Combustion Engine Division Fall Technical Conference
September 23–26, 2012
Vancouver, BC, Canada
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
978-0-7918-5509-6
PROCEEDINGS PAPER
Understanding Loss Mechanisms and Identifying Areas of Improvement for HCCI Engines Using Detailed Exergy Analysis Available to Purchase
Samveg Saxena,
Samveg Saxena
Lawrence Berkeley National Laboratory, Berkeley, CA
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Iván Dario Bedoya,
Iván Dario Bedoya
University of Antioquia, Medellin, Colombia
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Nihar Shah,
Nihar Shah
Lawrence Berkeley National Laboratory, Berkeley, CA
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Amol Phadke
Amol Phadke
Lawrence Berkeley National Laboratory, Berkeley, CA
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Samveg Saxena
Lawrence Berkeley National Laboratory, Berkeley, CA
Iván Dario Bedoya
University of Antioquia, Medellin, Colombia
Nihar Shah
Lawrence Berkeley National Laboratory, Berkeley, CA
Amol Phadke
Lawrence Berkeley National Laboratory, Berkeley, CA
Paper No:
ICEF2012-92052, pp. 723-736; 14 pages
Published Online:
July 25, 2013
Citation
Saxena, S, Bedoya, ID, Shah, N, & Phadke, A. "Understanding Loss Mechanisms and Identifying Areas of Improvement for HCCI Engines Using Detailed Exergy Analysis." Proceedings of the ASME 2012 Internal Combustion Engine Division Fall Technical Conference. ASME 2012 Internal Combustion Engine Division Fall Technical Conference. Vancouver, BC, Canada. September 23–26, 2012. pp. 723-736. ASME. https://doi.org/10.1115/ICEF2012-92052
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