Journal
INTERNATIONAL JOURNAL OF ENGINE RESEARCH
Volume 21, Issue 5, Pages 781-793Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1468087418783637
Keywords
Diesel; natural gas dual-fuel engine; CFD; wide range of injection timings; heat release rate; emissions; in-cylinder analysis; spray distribution; ignition spots; regimes of combustion
Funding
- National Science Foundation (NSF) XSEDE through the Pittsburgh Supercomputing Center (PSC) [ASC110028]
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Computational fluid dynamics simulations are performed to investigate the combustion and emission characteristics of a diesel/natural gas dual-fuel engine. The computational fluid dynamics model is validated against experimental measurements of cylinder pressure, heat release rate, and exhaust emissions from a single-cylinder research engine. The model predictions of in-cylinder diesel spray distribution and location of diesel ignition sites are related to the behavior observed in measured and predicted heat release rate and emissions. Various distributions of diesel fuel inside the combustion chamber are obtained by modifying the diesel injection timing and the spray included angle. Model predictions suggest that the distribution of diesel fuel in the combustion chamber has a significant impact on the characteristics of heat release rate, explaining experimental observations. Regimes of combustion in the dual-fuel engine are identified. Turbulent flame speed calculations, premixed turbulent combustion regime diagram analysis, and high-temperature front propagation speed estimation indicated that the dual-fuel combustion in this engine was supported by successive local auto-ignition and not by turbulent flame propagation.
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