Asymmetry increase in the course of compression pressure as a measure of obstruction in indicating channel

• Autorzy: Łutowicz M.

Identyfikatory

DOI

10.5604/12314005.1216537

• Języki publikacji: EN

Abstrakty

EN

Indicating process of large combustion engines for both marine and industrial applications is performed using the indicating channels with valves. The impact of these channels on the values of parameters obtained from engine’s indication is significant. In previous studies, it had been shown that during exploitation accidental degradation of the indicating channels occurs. Carbon deposits, which appear in the channels, are limiting their patency. Leaks in channels connections are also appeared. Disregarded state of degradation of indicating channels will change the image of indicated pressure course, different for each cylinder of the engine. When cylinders are indicated using commercial instruments, the status of the channel is not in any way taken into account. At one gas compressing station in Poland, which has compressor diagnostic system, developed by the author, with stationary indicator, inverted IIR filter has been used. This filter is used to adjust the recorded waveforms of indicated pressure on motor-compressors GMVH type, and the filter coefficient is chosen to offset the associated throttling signal delay. Information about the delay of the signal is missing, however, in the case of popular portable indicators that do not use tags from crankshaft position. The paper presents a method for assessing the state of the indicating channel, based on the asymmetry measurement of compression course obtained after cut-off the fuel supply to the tested cylinder. The study model shows that leakage from the combustion chamber, interference in cooling and other defects cause only slight and predictable disruption of symmetry. The analysis of compression pressure course (without fuel delivery) immediately prior to each cylinder indication, in the case of positive verification, increases the reliability of diagnosis. In the case of negative verification, measure of the asymmetry could be the basis for the adjustment of acquired pressure waveforms and achieved from them parameters.

Słowa kluczowe

EN

marine diesel engine; indicated; indicated channel; diagnostics

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2016
• Tom: Vol. 23, No. 3
• Strony: 311--316
• Opis fizyczny: Bibliogr. 4 poz., rys.

Twórcy

autor

Łutowicz M.

• Polish Naval Academy in Gdynia Department of Mechanical-Electrical Engineering Śmidowicza Street 69, 81-103 Gdynia, Poland tel.: [phone]

Bibliografia

• [1] Cuper, D., Łutowicz, M., Influence of indicator valve channel untightens and loss of patency on the parameters values image obtained from indicator diagram, Journal of KONES Powertrain and Transport, Vol. 18, No. 4, Warszawa 2011.
• [2] Łutowicz, M., Reverse IIR filter as a tool for cylinder indicating channel patency impact correction on measured cylinder pressure waveform, Journal of KONES Powertrain and Transport, Vol. 20, No. 2, Warszawa 2013.
• [3] Łutowicz, M., Evaluation of the Condition of Cylinder Systems of the Engine Based Ion and Compression Process Analysis, Polish Journal of Environmental Studies, Vol. 18, No. 2A, Olsztyn 2009.
• [4] Wimmer, A., Glaser, J., Indykowanie silnika, Engine indication, AVL List GmbH Representation in Poland, Warszawa 2004.

Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.