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2 Journal of Polish CIMAC

2 Kowalski J.

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The model of the exhaust gas duct flow of the marine 4-stroke diesel engine

Kowalski J.

Journal of Polish CIMAC

2013

Vol. 8, no 1

59--66

The manuscript presents the model of the exhaust gas flow through the exhaust gas duct of the marine 4-stroke engine. Presented model are computational fluid dynamic model based on dimensions and the construction of the real exhaust gas duct. The measurement parameters from real object are used to the model validation. The simulation of the exhaust gas duct throttling by rotational throttling plate was done. Obtained calculation results allow to determination of the exhaust gas mass flow for the simulated flow characteristics. The model of turbulence flow was taken into account. The gravity forces and the heat transfer phenomena were neglected. Obtained calculation results are qualitatively consistent with results obtained from literature. The analyze of the velocity distribution in the exhaust gas duct allows to conclusion that the changes of the angular position of the throttling plate causes significant disturbances in the exhaust gas flow. The result of this is the decrease of the exhaust gas flow. Additional purpose of the manuscript was approximation of the obtained results of the exhaust gas flow for different angular positions of the throttling plate. Obtained polynomial function may be useful tool to modeling the combustion process in the engine cylinders for the different flow characteristics of the exhaust gas duct. The calculation results allow to determination the mass flow of the exhaust gas with mean error equal 11%.

Labolatory study on influence of the exhaut gas composition in marine four-stroke diesel engine

Kowalski J.

Journal of Polish CIMAC

2012

Vol. 7, no 1

109-116

Presented paper shows results of laboratory tests on the relationship between the throttling of a cross area of an exhaust outlet duct and the composition of exhaust gas from the marine engine. The object of research is a laboratory four-stroke diesel engine, worked with a load from 50kW to 250kW at a constant speed equal 750rpm. During the laboratory tests over 50 parameters were measured of the engine with technical condition recognized as a "working properly" and with simulated the exhaust outlet duct throttling. The simulation consisted of changing the angle of the barrier mounted in the exhaust duct after the turbine, limiting duct cross-sectional area. Results of laboratory research confirm that the best indicator of the throttling of the exhaust gas duct among considered thermodynamic parameters of the engine is pressure of exhaust gas after turbine. Unfortunately mentioned pressure is usually very little and for this reason technically difficult to measure during on-board operation. In the case of measuring the composition of exhaust gas, the throttling of the exhaust gas duct causes visible changes of the oxygen and carbon oxide quantity in the exhaust gas. Other measured gaseous components changed not significant during the throttling of the exhaust gas. The conclusion is that the results of measurements of the composition of exhaust gas may contain valuable diagnostic information about the technical condition of the exhaust gas duct of the marine engine.