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Abstract
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One of the most important emerged technologies to improve the emission characteristics of
internal combustion engines is the dual-fuel combustion engines being fueled with an abundant clean
environmentally friendly fuel such as natural gas as the main fuel while having conventional compression
ignition engine design. In this research, a three-dimensional CFD model of fluid flow coupled with the
chemical kinetics mechanism is developed and the numerical results of a partially premixed combustion
of natural gas and diesel fuel are presented in different piston bowl shapes. The results of the numerical
analyses for different combustion chamber designs in the natural gas-diesel dual fuel engine reveal that
the bathtub shape geometry, comparing with other piston-bowl geometries, results in a combustion being
more efficient and yielding better performance
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