Original scientific paper
Analysis of Soot and NOx Emissions Reduction Possibilities on Modern Low Speed, Two-Stroke, Diesel Engines
Tomislav SENČIĆ
orcid.org/0000-0001-5011-7344
; Technical Faculty of the University of Rijeka, Rijeka, Croatia
Abstract
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.
* Defended Doctoral Thesis (2010)
Keywords
Čađa; Dušikovi oksidi; Dvotaktni sporohodni dizelski motor; Emisije; 3D numerička simulacija
Hrčak ID:
66560
URI
Publication date:
29.10.2010.
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