Based on the GT-Power software, an engine cycle simulation for a biodiesel
fueled direct injection compression ignition engine was developed and used to study its
performance and emission characteristics. The major objectives were to establish the
engine model for simulation and then apply the model to study the biodiesel fueled
engine and compare it to a petroleum-fueled engine.
The engine model was developed corresponding to a 4.5 liter, John Deere 4045
four-cylinder diesel engine. Submodels for flow in intake/exhaust system, fuel injection,
fuel vaporization and combustion, cylinder heat transfer, and energy transfer in a
turbocharging system were combined with a thermodynamic analysis of the engine to
yield instantaneous in-cylinder parameters and overall engine performance and emission
characteristics.
At selected engine operating conditions, sensitivities of engine performance and
emission on engine load/speed, injection timing, injection pressure, EGR level, and
compression ratio were investigated. Variations in cylinder pressure, ignition delay, bsfc,
and indicated specific nitrogen dioxide were determined for both a biodiesel fueled
engine and a conventional diesel fueled engine. Cylinder pressure and indicated specific
nitrogen dioxide for a diesel fueled engine were consistently higher than those for a
biodiesel fueled engine, while ignition delay and bsfc had opposite trends. In addition,
numerical study focusing on NOx emission were also investigated by using 5 different
NO kinetics. Differences in NOx prediction between kinetics ranged from 10% to 65%.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-2009-08-3234 |
| Date | 14 January 2010 |
| Creators | Zheng, Junnian |
| Contributors | Caton, Jerald A. |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis |
| Format | application/pdf |
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