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1
Content available Model tests of a marine diesel engine powered by a fuel-alcohol mixture
Zacharewicz Marcin, Kniaziewicz Tomasz
Combustion Engines
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2022
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R. 61, nr 2
83--88
EN
The paper presents the results of model and empirical tests conducted for a marine diesel engine fueled by a blend of n-butanol and diesel oil. The research were aimed at assessing the usefulness of the proprietary diesel engine model in conducting research on marine engines powered by alternative fuels to fossil fuels. The authors defined the measures of adequacy. On their basis, they assessed the adequacy of the mathematical model used. The analysis of the results of the conducted research showed that the developed mathematical model is sufficiently adequate. Therefore, both the mathematical model and the computer program based on it will be used in further work on supplying marine engines with mixtures of diesel oil and biocomponents.
2
Content available The emission of harmful compounds from the marine diesel engine fueled by a blend of n-butanol and marine fuel
Bogdanowicz Artur, Kniaziewicz Tomasz, Zadrąg Ryszard
Combustion Engines
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2021
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R. 60, nr 4
90--95
EN
The use of renewable fuels may be an action leading to the reduction of pollutant emissions. This group includes biobutanol as a product of biomass fermentation. Some of its physicochemical properties, including the ability to mix with hydrocarbon fuels, make it suitable for use as a fuel component for marine diesel engines. The article presents the results of research on the concentration of exhaust gas components of a Sulzer 6AL20/24 diesel engine powered by a mixture of n-butane and diesel oil. The emission intensity were calculated for the tested components: carbon monoxide, carbon dioxide and nitrogen oxides. The emission intensity surface graphs were created based on the calculated data. The tests were carried out using different concentrations of the mixture of n-butanol and marine fuel.
3
Content available Evaluation of adequacy of a model of a marine diesel engine based upon empirical research
Kniaziewicz Tomasz, Zacharewicz Marcin
Combustion Engines
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2020
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R. 59, nr 2
40--45
EN
The article presents a mathematical model of a marine diesel engine developed for the needs of the research on the innovative method of evaluating technical condition of a marine engine. Basic assumptions of the method under development have also been included. The main focus has been directed on the evaluation of adequacy of a mathematical model of a marine diesel engine proposed in this article. In addition, measures of adequacy for the needs of the conducted research have also been presented. Finally, the article shows results from the conducted research followed by conclusions.
4
Content available Method of evaluation of the technical condition of the diesel-electric unit
Zacharewicz Marcin, Kniaziewicz Tomasz
Diagnostyka
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2019
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Vol. 20, No. 2
113--119
EN
The article presents an innovative method of evaluating technical condition of marine diesel engines driving electric power generator. The presented method is based on measurements of the phase-to-phase voltage of the synchronous generator and on measurements of the acceleration of the injector needle. The basis for the method is an assumption that the shapes of the waveforms of the phase-to-phase voltage of the generator include information on fluctuations of the angular velocity of the engine crankshaft. Consequently, these fluctuations depend directly on the course of the working process occurring in the engine cylinders. The vibrating signal is used to synchronize the shapes of the voltage waveforms with the engine working process.
PL
W artykule przedstawiono nowatorską metodę oceny stanu technicznego okrętowych tłokowych silników spalinowych o zapłonie samoczynnym napędzających prądnice. Prezentowana metoda bazuje na pomiarach napięcia międzyfazowego prądnicy synchronicznej oraz na pomiarze przyspieszeń iglicy wtryskiwacza. Podstawą metody jest założenie, że przebiegi napięcia międzyfazowego prądnicy zawierają informację o fluktuacjach prędkości kątowej wału korbowego silnika. Natomiast fluktuacje te zależą bezpośrednio od przebiegu procesu roboczego realizowanego w cylindrach silnika. Sygnał drganiowy wykorzystywany jest do synchronizacji przebiegów napięcia z cyklem roboczym silnika.
5
Content available Simulation of concentrations harmful compounds from main ship’s propulsion engine cooperating with a fixed pitch propeller in dynamic states
Bogdanowicz Artur, Kniaziewicz Tomasz
Combustion Engines
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2019
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R. 58, nr 3
51--55
EN
The article presents a mathematical model of a marine propulsion system and a computer program based on the LabVIEW environment. For a purpose of model construction, a ship's hull resistance was identified and an approximation equations of the Wageningen institute for ship propellers were used. The ship's motion equations were used to build the propulsion system model. On the basis of conducted tests of Sulzer 6AL20 / 24 marine engine, a map of concentrations harmful compounds was created in various load state and transferred to a computer program.
6
Content available Method for assessing the technical condition of marine diesel engine driving the synchronous generator
Kniaziewicz Tomasz, Zacharewicz Marcin
Combustion Engines
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2019
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R. 58, nr 2
139--144
EN
The paper presents an innovative method for assessing technical condition of a marine diesel engine that drives synchronous genera-tor. It is based on the measurement and analysis of generator's phase-to-phase voltage. Additionally, it requires the measurement of a pseudoperiodic signal [3] with a period equal to duration of engine's working cycle. The basis for developing method was the assumption that rotational speed fluctuations of an engine’s crankshaft (and also the generator) depend on a course of a working process carried out in it. The generator's phase-to-phase voltage is directly dependent on a rotational speed fluctuation of its rotor. It must therefore be possible to assess a course of a working process of an engine based on a voltage waveform of a synchronous generator that cooperates together.
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