Pilot injection ignition properties under low-temperature dilute in-cylinder conditions
Abstract not provided.
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Jump to search filtersThe impact of fuel mass injection pressure ambient temperature and swirl ratio on the mixture preparation of a pilot injection
Abstract not provided.
The impact of injection timing on mixture preparation and chemical kinetics in low-temperature diesel combustion
Proceedings of the 8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012
Mixture formation and the chemical kinetics of combustion are examined in an automotive diesel engine operating at 1500 rpm and a fuel quantity corresponding to 3 bar gross IMEP. Laser-induced fluorescence of a toluene fuel tracer is used to obtain quantitative in-cylinder distributions of the fuel-air equivalence ratio, and homogeneous reactor simulations employing detailed chemistry are used to examine the impact of kinetics. With advanced combustion timing, losses in combustion efficiency and work output are found to be dominated by deficiencies in the mixture preparation process. With retarded injection, however, the chemical kinetics of combustion is the limiting factor. Trends in engine-out emissions are consistent with the measured mixture distributions and the results of the simulations. Copyright © 2012 by the Japan Society of Mechanical Engineers.
Review of Equivalence Ratio Measurements in a Light-Duty Diesel Engine Operating in a Light-Load Partially Premixed Regime
Abstract not provided.
Quantitative mixture preparation studies in late-injection diesel combustion systems using Toluene LIF
Abstract not provided.
The impact of swirl ratio and injection pressure on fuel-air mixing in a light-duty diesel engine
Proceedings of the Spring Technical Conference of the ASME Internal Combustion Engine Division
Toluene fuel-tracer laser-induced fluorescence is employed to quantitatively measure the equivalence ratio distributions in the cylinder of a light-duty diesel engine operating in a low-temperature, high-EGR, and early-injection operating mode. Measurements are made in a non-combusting environment at crank angles capturing the mixture preparation period: from the start-of-injection through the onset of high-temperature heat release. Three horizontal planes are considered: within the clearance volume, the bowl rim region, and the lower bowl. Swirl ratio and injection pressure are varied independently, and the impact of these parameters on the mixture distribution is correlated to the heat release rate and the engine-out emissions. As the swirl ratio or injection pressure is increased, the amount of over-lean mixture in the upper central region of the combustion chamber, in the bowl rim region and above, also increases. Unexpectedly, increased injection pressure results in a greater quantity of over-rich mixture within the squish volume. Copyright © 2012 by ASME.
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