An Experimental Study of Emission and Combustion Characteristics of Marine Diesel Engine in Case of Cylinder Valves Leakage

Kowalski, Jerzy

doi:10.1515/pomr-2015-0061

Cited by 8 publications

(6 citation statements)

References 26 publications

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“…The sensitivity analysis results (derived trade-offs) are presented in Table 11, whereas the comparisons of the trade-offs with pertinent studies are presented in Table 12 for the ambient temperature variations and Table 13 for the anomalies, respectively. The ambient temperature trade-offs were compared with the trade-offs reported by Whitehouse et al [62], Serrano et al [63], MAN [64], whereas the anomaly condition trade-offs were compared to those reported by Kowalski [60]. From these tables, it is deduced that the predicted trade-offs are sound corresponding to the reported ones.…”

Section: Dt Management and Trustworthiness Managementmentioning

confidence: 79%

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A Framework to Assure the Trustworthiness of Physical Model-Based Digital Twins for Marine Engines

Jeon,

Theotokatos

2024

JMSE

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Digital twins (DTs) are gradually employed in the maritime industry to represent the physical systems and generate datasets, among others. However, the trustworthiness of both the digital twins and datasets must be assured. This study aims at developing a framework to assure the trustworthiness of marine engines DTs based on first-principle models. This framework considers the phases of the DT development, progressivity, and trustworthiness assurance, the latter being based on three steps, namely validation, verification, and robustness. Subsequently, a methodology is applied to develop the DT of a marine engine for healthy conditions, which is extended to represent a wider operating envelope considering systematically identified anomalies. The results demonstrate that the developed DT trustworthiness is assured, as the validation step provided errors within ±3%, the verification step provided sound trade-offs, whereas the robustness assessment step confirmed acceptable uncertainty ratios. Subsequently, the DT is employed to generate datasets required for developing a data-driven model for anomaly diagnosis, which exhibits an accuracy of 98.8% for anomaly detection, 97.6% for anomaly identification, and 90.1–91.8% for anomaly isolation. This is the first study addressing the trustworthiness of DTs for marine engines, and as such advances concepts of the fourth industrial revolution to the shipping industry.

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Section: Dt Management and Trustworthiness Managementmentioning

confidence: 79%

“…Hence, the following four severity levels were considered: No Leakage, Acceptable Clearance, Weak Leakage, and Severe Leakage. The engine performance parameters with the greater impact from these anomalies as well as their trade-offs were identified based on the pertinent literature [60,61].…”

Section: Dt Management and Trustworthiness Managementmentioning

confidence: 99%

A Framework to Assure the Trustworthiness of Physical Model-Based Digital Twins for Marine Engines

Jeon,

Theotokatos

2024

JMSE

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“…Warunki brzegowe i początkowe wyznaczono na podstawie badań laboratoryjnych, których przebieg przedstawiono w pracach [12][13][14].…”

Section: The Model Results and Validationunclassified

“…The constant values of the heat transfer coefficient, the thermal resistance and the emissivity were adopted. Boundary and initial conditions were determined on the basis of laboratory tests, which are described in detail in [12][13][14].…”

Section: Rys 1 Rzuty Ruchomej Siatki Przestrzennej W Chwili Przepłumentioning

confidence: 99%

The model of combustion process in the marine 4-stroke engine for exhaust gas composition assessment

Kowalski

2016

Combustion Engines

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The paper presents the model of combustion process in the marine, turbocharged, 4-stroke and Diesel engine. The main target of modeling is the assessment of the exhaust gas composition. Presented multi-zone, 3-D model of combustion process consists of the following sub-models of processes: the fuel injection, the brake-up and the evaporation of fuel and the turbulence flow and the heat transfer phenomena. Presented model basis on the 3Z-ECFM mechanism of combustion and the initial and boundary conditions collected during direct measurements. The positive validation of the calculation results are obtained for mean and maximum value of the combustion pressure and values of oxygen and nitric oxides fractions in the exhaust gas. Unfortunately, fractions of carbon compounds in the exhaust gas are not properly calculated.

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“…The selected research object was the marine 4-stroke, 3-cyllinder, direct injected and turbocharged Diesel engine. The parameters of the engine are presented on the Tab.1 and the detailed description of the laboratory research is presented in [9][10][11].…”

Section: Laboratory Researchmentioning

confidence: 99%

The Theoretical Study on Influence of Fuel Injection Pressure on Combustion Parameters of the Marine 4-Stroke Engine

Kowalski

2016

Journal of KONES. Powertrain and Transport

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The manuscript presents the analysis of influence of fuel injection pressure on the combustion parameters of marine 4-stroke diesel engine. Analysis is based on computational fluid dynamic (CFD) model designed on the basis of the motion mesh of combustion chamber of the marine engine cylinder and air inlet and exhaust gas ducts. Presented model consists of models of fuel injection into combustion chamber, breaking-up and evaporation of the fuel, mixing with air and turbulent combustion with heat transfer to construction elements of the engine cylinder. Mentioned CFD model is validated according to boundary and initial conditions taken from direct measurements. The chosen research object is laboratory 4-stroke turbocharged Diesel engine with direct injection of the fuel and mechanically controlled of both cylinder valves and the injector. During the calculation the fuel dose, delivered into the engine cylinder was changed without any other changes in the initial and boundary conditions. This approach to the problem allows to the cause-effect analysis. The results of presented study are as follows: The increase of the fuel injection pressure causes the increase of fuel dose, delivered into the engine cylinder and the increase of intensity of both kinetic and diffusion stage of the combustion process. The result of this is the increase of pressure and temperature of the combustion and significant increase of the NOx fraction despite the decrease of the O2 content in the combustion chamber of the engine.

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An Experimental Study of Emission and Combustion Characteristics of Marine Diesel Engine in Case of Cylinder Valves Leakage

Abstract: Presented paper shows the results of the laboratory tests on the relationship between throttling of both air intake duct and exhaust gas duct and a gaseous emission from the marine engine.

Cited by 8 publications

References 26 publications

A Framework to Assure the Trustworthiness of Physical Model-Based Digital Twins for Marine Engines

A Framework to Assure the Trustworthiness of Physical Model-Based Digital Twins for Marine Engines

The model of combustion process in the marine 4-stroke engine for exhaust gas composition assessment

The Theoretical Study on Influence of Fuel Injection Pressure on Combustion Parameters of the Marine 4-Stroke Engine

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