High demands are placed on large gas engines in the areas of performance, fuel consumption and emissions. In order to meet all these demands, it is necessary to operate the engine in its optimal range. At high engine loads the optimal operation range becomes narrower as the engine comes closer to the knocking or to the misfire limit. The ambient conditions are of increasing importance in this range of operation. Variations in humidity influence the engine’s burn rate characteristics. An increase in humidity reduces the burn rate and increases the combustion duration. This increase in combustion duration has the same effect as retarding the time of ignition. Thus the thermal efficiency is reduced. Additionally, the engine is more likely to misfire as humidity increases. The cylinder temperature affects the engine fuel efficiency, knocking, exhaust gas temperature and particularly NOx emission. An increase in manifold air temperature results in higher NOx emission, heat transfer and knocking tendency. To avoid knocking, the time of ignition must be retarded resulting in lower engine efficiency. In this paper the effects of changes in humidity and temperature of the intake air on engine performance were examined in a lean burn pre-chamber natural gas engine. Tests on a single cylinder research engine were carried out. Effects on knocking and misfire limit, NOx emissions and fuel consumption were investigated depending on engine load. The interpretation of the results was supported by an extended analysis of losses.
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ASME 2006 Internal Combustion Engine Division Fall Technical Conference
November 5–8, 2006
Sacramento, California, USA
Conference Sponsors:
- Internal Combustion Engine Division
ISBN:
0-7918-4260-6
PROCEEDINGS PAPER
Effects of Humidity and Ambient Temperature on Engine Performance of Lean Burn Natural Gas Engines
Andreas Wimmer,
Andreas Wimmer
LEC-Large Engines Competence Center, Graz, Austria
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Eduard Schnessl
Eduard Schnessl
LEC-Large Engines Competence Center, Graz, Austria
Search for other works by this author on:
Andreas Wimmer
LEC-Large Engines Competence Center, Graz, Austria
Eduard Schnessl
LEC-Large Engines Competence Center, Graz, Austria
Paper No:
ICEF2006-1559, pp. 421-429; 9 pages
Published Online:
September 5, 2008
Citation
Wimmer, A, & Schnessl, E. "Effects of Humidity and Ambient Temperature on Engine Performance of Lean Burn Natural Gas Engines." Proceedings of the ASME 2006 Internal Combustion Engine Division Fall Technical Conference. ASME 2006 Internal Combustion Engine Division Fall Technical Conference (ICEF2006). Sacramento, California, USA. November 5–8, 2006. pp. 421-429. ASME. https://doi.org/10.1115/ICEF2006-1559
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