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Low Cooling Losses and Low Emission Analysis of Small Bore Diesel Engine Combustion
ISSN: 0148-7191, e-ISSN: 2688-3627
Published September 01, 2015 by SAE International in United States
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Small bore diesel engines often adopt a two-valve cylinder head and a non-central injector layout to expand the port flow passage area. This non-central injector layout causes asymmetrical gas flow and fuel distribution, resulting in worse heat losseses and a less homogenous fuel-air mixture than an equivalent four-valve cylinder head layout with a central injector. To improve these problems Toyota applied a new concept which was characterized by tapered shape design on the upper portion of the piston and low compression ratio to achieve more homogeneous gas flow and fuel-air mixture. This paper describes the impact of new combustion concept and the mechanism of the improvement by 3D-CFD analysis and optical measurement.
CitationNishida, K., Hashizume, T., Hasegawa, R., and Ogawa, T., "Low Cooling Losses and Low Emission Analysis of Small Bore Diesel Engine Combustion," SAE Technical Paper 2015-01-1824, 2015, https://doi.org/10.4271/2015-01-1824.
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