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1 Journal of Polish CIMAC

1 2012

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Influence of gas channels of medium speed marine engines on the accuracy of determination of diagnostic parameters based on the indicator diagrams

Pawletko R., Polanowski S.

Journal of Polish CIMAC

2012

Vol. 7, no 2

139-146

Analysis of the indicator diagram is the basis of technical state evaluation of marine diesel engines. The indicator diagram contains a large amount of diagnostic information. A major problem for the diagnostic use of the indicator diagrams in case of medium speed engines are distortion caused by the gas channels between the cylinder and the pressure sensor. Indicator channel and valve may introduce significant distortions which increases with increasing engine speed. The paper presents results of results of the analysis of the indicator diagram of engines in onboard service, and research conducted on the medium speed laboratory engine Al 25/30. These engines are characterized by gas channels of high complexity. During laboratory research pressure measurement (indication) was made by the sensor placed directly in the cylinder (instead of starting air valve), before the indicator valve (with special Kistler adapter) and on the indicator valve. Distortion of heat release characteristics for the sensor placed on the indicator valve is important, but it is estimated that diagnostic information is not erased. For medium speed engines is to be expected the use of a portable pressure sensors placed on the indicator valve. For this reason, further research is needed to assess the impact of channels and valves on different cylinders. During the research the course of heat release rate q and the heat released Q were determined. The curve of heat release rate q is a full equivalent to fuel injection pressure curve in the fuel pipes. It allows identification of the failure of the injection system. The curve of Q allows such determination and assessment of internal efficiency of the cylinder.