Naslov
Analysis of Soot and NOx Emissions Reduction Possibilities on Modern Low Speed, Two-Stroke, Diesel Engines

Autori
Senčić, Tomislav

Izvornik
Strojarstvo (0562-1887) 52 (2010), 5; 525-533

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
emissions; nitrogen oxides; soot; two stroke low-speed diesel engine; 3D numerical simulation

Sažetak
The reduction of NOx and soot emissions are, besides improvement of fuel efficiency, the main goals of the development of modern diesel engines. The manufacturers of large marine engines are developing systems that allow great operation flexibility and different strategies that allow the mentioned goals. Except for experimental measurements, the computer simulation is a tool that is used for this scope. 3D numerical simulations are the most appropriate for the calculation of pollutant production. The large marine engines are specific for their size, fuel used, location of the injectors and small revolution rate. In the present work, a large marine engine model was developed with the OpenFOAM software toolbox. A heavy fuel oil and a soot model were built in. Spray model parameters were tuned. A set of different calculation meshes was tested. The model validation was performed on a constant volume combustion chamber, an automotive engine and, finally, on a large marine engine. After a satisfactory matching with experimental measurements, a set of numerical simulations was performed by which the possibility of emission reduction was evaluated. The strategies of scavenging air temperature reduction, exhaust gas recirculation and alternative injection patterns were used. After the end of the analysis all the methods resulted in a reduction of pollutant emissions.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo

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