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

• Autorzy: Pawletko R. , Polanowski S.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

marine combustion engines; indicator valve; indicator diagram analysis

• Wydawca: Faculty of Ocean Engineering and Ship Technology, Gdańsk University of Technology
• Czasopismo: Journal of Polish CIMAC
• Rocznik: 2012
• Tom: Vol. 7, no 2
• Strony: 139--146
• Opis fizyczny: Bibliogr. 6 poz., rys., tab.

Twórcy

autor

Pawletko R.

autor

Polanowski S.

• Gdynia Maritime Univeristy ul. Morska 81-87, 81-226 Gdynia, Poland tel.: [phone],

Bibliografia

• [1] Trunen, R., Kaario, O., Liljenfeldt, G., Cylinder pressure measurement via indicating Cock, CIMAC 2007.
• [2] Oezatay, E., Onder, C., Model based sensor reconstruction of in-cylinder pressure trace using indicator cock pressure information, Cimac Congress 2010, Bergen paper no. 166.
• [3] Pawletko, R., Polanowski, S., Influence of TDC determination methods on mean indicated pressure errors in marine diesel engines, Journal of KONES, Vol. 18, No. 2, Warsaw 2011.
• [4] Pawletko, R., Polanowski. S. Research of the influence of marine diesel engine Sulzer Al 25/30 load on the TDC position on the indication graph, Journal of Kones Powertrain and Transport, Vol. 17, No. 3, p. 361-368 , Warsaw 2010.
• [5] Polanowski, S, Determination of location of Top Dead Centre and compression ratio value on the basis of ship engine indicator diagram, Polish Maritime Research _ 2(56), 2008, Vol. 15.
• [6] Polanowski, S. Pawletko, R., Application of multiple moving approximation with polynomials in curve smoothing, Journal of Kones Powertrain and Transport, Vol. 17, No. 2, p. 395-402, Warsaw 2010.