The effect of reducing injector size on dual-fuel engine performance
Abstract
The possibility of reducing the pilot portion of diesel fuel in a modern dual-fuel engine is limited by overheating of the injector due to its poor cooling by the fuel. Reducing the size of the nozzle improves its cooling. The possibility of using a smaller injector from a passenger car on a truck dual-fuel engine was analyzed in order to reduce the pilot portion of diesel fuel from 15% to 6%. Since engine operation at full load in diesel mode with smaller injector is impossible, we fulfilled modeling in the AVL FIRE software of a dual-fuel engine operation with both diesel and gas type combustion chambers, large and small injectors, two pilot portions of diesel fuel, at full and partial loads. When the pilot portion of diesel fuel was reduced by almost three times, replacing the diesel combustion chamber with an omega-shaped one and using the smaller injector led to an increase in effective efficiency by 2% at full load and 4% at 25% load. Emissions of nitrogen oxides increased up to 3.5 times, but did not exceed 93 ppm. Emissions of unburned hydrocarbons changed insignificantly.
About the Authors
Igor V. Maksimov
MADI
Russian Federation
Russian Federation
postgraduate
Vladimir V. Sinyavskiy
MADI
Russian Federation
Russian Federation
Candidate of Sciences (Technical), associate professor
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Review
Рецензент: Матюхин Л.М., канд. техн. наук, доц., МАДИ
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