Abstract
A better spatial distribution is required for the injected fuel throughout the entire space of combustion geometry in DI diesel engine, to obtain a better combustion with lesser emission. In order to effectively make use of gas flows it is mandatory to match the piston bowl geometry with fuel spray characteristics. For obtaining better combustion, matching of combustion chamber geometry, fuel injection and gas flow plays prominent role. The model was developed in computational fluid dynamics (CFD) code, ANSYS FLUENT. The simulations were conducted for the combinations of swirl ratio, three split injection and four piston bowl geometries (Case A,B,C and D). The simulation results revealed that, the pilot injection creates favorable condition for the upcoming main fuel injection in the case of multiple injection. In case of multiple injections there is a considerable reduction in NO formation. The final NO formed is 24% lower than that of normal injection and 22% lower than that of the retarded injection. The combination of split injection with suitable combustion chamber configuration would greatly enhance the engine performance, besides reducing emission level to a greater extent.
Highlights
Apart from different piston bowl configurations and fuel injection timings, split injection impact a significant role in the DI diesel engine operation
The results showed that the modified combustion
Based on the implementation of modified eddy dissipation conept into the computational fluid dynamics (CFD) code, combustion/ignition model is considered for the simulation analysis
Summary
Apart from different piston bowl configurations and fuel injection timings, split injection impact a significant role in the DI diesel engine operation. The effect of piston bowl configurations and various injection timings i.e., Early, Conventional and Retarded) on in-cylinder fluid flow characteristics and formation of the pollutants are discussed elaborately in the previous cases [1]. Genzale et al (2007) carried out a computational investigation to study the effects of bowl geometry, fuel spray targeting, and swirl ratio for low-temperature combustion in a heavy-duty diesel engine. The modified combustion chamber geometry improved the BSFC by around 10 % and reduced the soot by 16% and slightly increased in NOx (3%) emission. Few of the vital conclusions drawn from the literature survey include: Swirl is a key parameter that impacts on the airfuel mixing ratios, combustion quality, heat release, overall engine performance and emissions. The timings for pilot injection and main injection events are carefully designed, such that the internal pressure rise due to combustion starts a little before TDC
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