Abstract
For a certain type of direct injection diesel engine, a three-dimensional model of a single-cylinder complete combustion chamber and in-take/exhaust port was established. Three-dimensional Computational Fluid Dynamics (CFD) analysis software CONVERGE was used for simulation. The effects of fuel injection strategy and combustion chamber geometry on combustion emissions of diesel engine were studied while the combustion chamber volume, engine compression ratio, total fuel injection quantity and total injection duration were kept unchanged. The results show that the strategy of multiple injection and reasonable shape of combustion chamber can effectively increase the turbulent kinetic energy in cylinder, improve the uniformity of oil-gas mixing, reduce the emission of pollutants, and increase the quality of after injection can further reduce the emissions of NOx and soot.
Highlights
Compared with gasoline engine, diesel engine has good fuel economy, reliability and higher thermal efficiency, so it is widely used in agriculture, industry, transportation and other fields
The author found that multiple fuel injection and the injection interval and single injection quantity optimization can effectively improve the mix of oil and gas, the mixture in cylinder is more thin, effectively reducing NOX and soot emissions
On the basis of previous researches, this paper adopts numerical simulation method to study the comprehensive influence of fuel injection strategy and combustion chamber shape on diesel engine emission
Summary
Diesel engine has good fuel economy, reliability and higher thermal efficiency, so it is widely used in agriculture, industry, transportation and other fields. The author found that multiple fuel injection and the injection interval and single injection quantity optimization can effectively improve the mix of oil and gas, the mixture in cylinder is more thin, effectively reducing NOX and soot emissions. The author compares the simulation results of four kinds of combustor shapes, and finds that increasing swirl chamber pit shape can improve oil and gas mixing and combustion, and reduce NOX and soot emission. On the basis of previous researches, this paper adopts numerical simulation method to study the comprehensive influence of fuel injection strategy and combustion chamber shape on diesel engine emission. The combined influence of fuel injection strategy and combustion chamber shape is analyzed comprehensively, which provides certain theoretical basis and research contribution for improving diesel engine combustion efficiency and reducing pollutant emission
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