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Turbulent Mixing of High Pressure, Intermittent Natural Gas and Liquid Diesel Fuel Sprays

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.1180
pages 561-564

Timothy R. White
School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney NSW 2052, Australia

Brian E. Milton
Emeritus Professor, School of Mechanical and Manufacturing Engineering The University of New South Wales Sydney, NSW 2052 Australia

Masud Behnia
School of Mechanical and Manufacturing Engineering, University of New South Wales, Sydney 2052, Australia


Natural gas, a naturally abundant fuel, cannot be used in conventional diesel engines because of its low cetane number. However, it can be used as the primary fuel with a pilot diesel spray for ignition. Most systems add the natural gas in the inlet manifold but there are many associated combustion problems. An alternative is to directly-inject both the gas and diesel fuel directly into the cylinders. In this case, the relative timing and location of the fuel sprays is important so that the turbulent mixing occurs both between them and with the air in the engine cycle to provide the appropriate conditions for ignition and burning. This paper reports a study using both experiments in purpose-designed rigs and CFD to provide fundamental data associated with this turbulent mixing.

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