scholarly journals Measurement methods in marine engine endoscopy

2008 ◽  
Vol 133 (2) ◽  
pp. 3-19
Author(s):  
Zbigniew KORCZEWSKI
Keyword(s):  
Surface Defect ◽  
Theoretical Background ◽  
Measurement Methods ◽  
Probe Laser ◽  
Digital Recording ◽  
Laser Method ◽  
Marine Engine ◽  
Diagnostic Endoscopy ◽  
Marine Engines ◽  
Engine Endoscopy

The paper presents selected metrological techniques that may be applied in diagnostic endoscopy in complex machinery including turbine and piston marine engines. The evolution of contemporary endoscopes has been described as well as theoretical background for optical and digital endoscopy. The methods of surface defect measurements of selected elements of marine engine structure have been presented based on a digital recording of endoscopic images: Stereo Probe, Shadow Probe, laser method and RGB.

scholarly journals TESTING PLANT FOR ENGINE WITH ENERGY EFFICIENT COOLING SYSTEM

2021 ◽  
Vol 2021 (1) ◽  
pp. 15-21
Author(s):  
Mikhail Nikolaevich Pokusaev ◽  
Alexei Viktorovich Trifonov ◽  
Vasiliy Aleksandrovich Kostyrenko
Keyword(s):  
Carbon Dioxide Emissions ◽  
Cooling System ◽  
Environmental Damage ◽  
Resistive Load ◽  
Marine Engine ◽  
Rotating Speed ◽  
Technical Parameters ◽  
Marine Engines ◽  
Russian River ◽  
Measurement And Control

The article focuses on developing a new testing system for the Iveco 8041I06 55 R900 engine in the laboratory “Marine Diesels” under Astrakhan state technical university in the event of modernizing the test benches with ship engines. There has been considered creating an ex-perimental unit for conducting heat-balance tests of a marine engine using modern measurement and control tools. The unit consists of a converted engine powered by a generator. The engine will be tested according to the generator characteristic. There is given the data on the main technical parameters of the tested engine and on the potential configuration of the instrument base. As a load for the generator, it is planned to use a resistive load device. A fuel micro-meter will be used to measure the fuel consumption. Flow meters are selected for measuring the flow rates. Heat carriers and temperature sensors are selected for measuring temperature of the exhaust gases. The parameters of the engine under consideration are compared with the requirements of the Russian River Register for marine engines. The scope of work on converting an industrial engine into a marine engine in terms of the modernization of the cooling system has been described. The unit is designed to study the ship's cooling system operation, in which the control is carried out by changing the speed of the suspended pump depending on the temperature of the seawater. There was selected a pump and a device to regulating its rotating speed. The positive effect is achieved by reducing the power consumed by the pump. It saves the fuel and reduces the environmental damage due to the lower carbon dioxide emissions

scholarly journals Determining the NOx emission from an auxiliary marine engine based on its operating conditions

2018 ◽  
Vol 44 ◽  
pp. 00155
Author(s):  
Lukasz Rymaniak ◽  
Jacek Pielecha ◽  
Lukasz Brzeziński
Keyword(s):  
Ecological Indicators ◽  
Operating Conditions ◽  
Nox Emission ◽  
Pollutant Emissions ◽  
Nox Emissions ◽  
Marine Engine ◽  
Marine Engines ◽  
Engine Construction ◽  
Emissions Intensity ◽  
Theoretical Considerations

The article presents considerations regarding determining the NOx emissions from auxiliary compression-ignition marine engines. In order to determine the real impact of a given object on air pollution, it is necessary to first carry out research aimed at determining its emission characteristics. Thus, it is necessary to conduct tests in real operating conditions or to calculate the ecological indicators based on the operating conditions. The paper presents the NOx emissions intensity of an auxiliary Tier III standard marine engine, which is used in the drive system of various heavy, off-road vehicles and water vessels. Due to the structure characteristics of the considered engine group, the presented relations and results refer to only one cylinder. This data was used to calculate the NOx emission of a marine auxiliary engine, which used the operating conditions obtained from dynamometer tests and the engine construction (the number of cylinders). The presented methodology of activities can be used to assess the ecological indicators of ships in actual navigation, including primarily the maneuvers performed in the port. The article is supplemented with theoretical considerations regarding the problem of pollutant emissions from auxiliary marine engines.

scholarly journals Numerical model to study the combustion process and emissions in the Wärtsilä 6L 46 four-stroke marine engine

2013 ◽  
Vol 20 (2) ◽  
pp. 61-66 ◽  
Author(s):  
M. I. Lamas ◽  
C. G. Rodríguez
Keyword(s):  
Combustion Process ◽  
Numerical Procedure ◽  
Temperature Fields ◽  
Exhaust Gas ◽  
Gas Composition ◽  
Marine Engine ◽  
Marine Engines ◽  
Marine Diesel ◽  
Computational Fluid Dynamics Cfd ◽  
Global Emissions

Abstract The aim of the present paper is to develop a computational fluid dynamics (CFD) analysis to study the combustion process in a four-stroke marine diesel engine, the Wartsila 6L 46. The motivation comes from the importance of emissions from marine engines in the global emissions, particularly for nitrogen oxides (NOx) and sulfur oxides (SOx). The pressure and temperature fields were obtained, as well as the exhaust gas composition. In order to validate this work, the numerical results were satisfactory compared with experimental ones, which indicates that this model is accurate enough to reproduce the fluid pattern inside the cylinder during the combustion process. Accordingly, the aim of future works is to use this numerical procedure to optimize the performance and reduce the emissions of the new marine engine designs.

scholarly journals Experimental Study on the Effect of Marine Engine Lubricant Degradation on Tribological Performance of Cylinder Liner and Piston Rings Contact Using a Tuning Fork Technology Based Oil Sensor

2019 ◽  
Author(s):  
M Anand ◽  
M Hadfield ◽  
JL Viesca ◽  
B Thomas
Keyword(s):  
Boundary Lubrication ◽  
Piston Ring ◽  
Tuning Fork ◽  
Cylinder Liner ◽  
Tribological Performance ◽  
Gas Pressure ◽  
Piston Rings ◽  
Marine Engine ◽  
Marine Engines ◽  
Lubrication Conditions

An investigation was carried out to study the effect of changes in oil quality on its tribological performance using a tuning fork technology based oil sensor. In this research, a tribological testing system was commissioned, to simulate the piston ring-cylinder liner sliding contact, and to measure the lubricant condition in real-time using an oil sensor. Tribological contact between cylinder liners and piston rings in marine engines is the most affected region due to excessive thermo-mechanical stresses. At top dead centre, the effect of such stresses is at a maximum where piston-sliding speed is lowest, while the temperature is high due to fuel combustion, and radial load behind the piston rings compressing against the cylinder liner surface is at a maximum due to gas pressure and the compression fit of piston rings within the cylinder liner. At bottom dead centre, this effect is less severe due to a reduction in temperature and gas pressure on the piston rings, as the piston is positioned away from the combustion chamber. These two regions experience boundary lubrication conditions, where anti-wear and anti-friction additives are responsible for forming a protective lubricious film on sliding surfaces. At mid-stroke, piston-sliding speed is maximum, therefore, a full hydrodynamic film is formed in this region separating the piston rings and cylinder liner. The formation of oil film depends upon, the physical properties of oil (such as viscosity and density) under hydrodynamic lubrication conditions, and the oil chemistry (such as presence of additives in oil) under mixed or boundary lubrication conditions. Lubricants in marine engines undergo intense degradation in quality due to contamination with wear particles, water, soot, un-burnt fuel, coolant, and additives depletion. Such degradation of lubricants leads to a reduction in their capability to form a minimum thickness of oil film between two moving engine components to avoid direct metal-to-metal contact, which may cause wear. Therefore, monitoring the condition of marine engine lubricants is vital in order to predict any significant change in its quality. The results obtained from tribology testing and oil condition monitoring in the current research showed a good correlation and are useful to understand the performance of lubricants for piston ring-liner contacts.

scholarly journals Selected aspects of application of dual fuel marine engines

2012 ◽  
Vol 148 (1) ◽  
pp. 25-34
Author(s):  
Tomasz KNIAZIEWICZ ◽  
Leszek PIASECZNY
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Method ◽  
Liquid Fuels ◽  
Dual Fuel ◽  
Fuel Gas ◽  
Simulation Research ◽  
Marine Engine ◽  
Marine Engines ◽  
Dual Fuel Engines ◽  
Marine Vessels

The paper presents examples of application of dual fuel marine engines based on the expertise of the largest marine engine manufacturers. The fueling systems of these engines have been presented as fueled with fuel gases in various combinations with liquid fuels. Examples of the application of dual fuel engines in vessels as well as variants of the powertrains have been shown. The results of own simulation research (Monte Carlo method) have also been presented related to the NOx emission from a variety of vessels operating in the area of the Bay of Gdansk proving that the use of engines fueled with fuel gas may indeed reduce the emission of NOx from marine vessels operating in this area.

The role of national distance in international business: a review from 1980 to 2017

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zhibin Zhou ◽  
Jongwook Kwon ◽  
Bo Zhang ◽  
Junjian Li ◽  
Hak cho Kim ◽  
...  
Keyword(s):  
International Business ◽  
Conceptual Development ◽  
Theoretical Background ◽  
Measurement Methods ◽  
Qualitative And Quantitative Analysis ◽  
Content Type ◽  
The Past ◽  
The Common ◽  
Micro Analysis

Purpose During the past several decades, national distance (ND) increasingly became a vital cornerstone in international business (IB) research, as both explicit and implicit distance are parts of the essential reasons for IB activities. However, there are various and chaotic methods to measure ND in the last literature; therefore, this paper aims to suggest legitimate uses of ND in the IB field and the best ND dimensions for various situations. Design/methodology/approach This paper used a historical overview of the theoretical background and conceptual development of ND based on the past four decades worth of studies in leading 17-IB journals using Google Scholar. The authors also focus on multiform ND measurement methods and details through qualitative and quantitative analysis based on previous studies’ data collection. Findings This research summarized the common measurement methods and elements of different ND and proposed solutions based on a multifaceted analysis. Originality/value The micro analysis examines each type of ND in terms of the proportion of variables, issues, measurement methods, representative proxies beyond previous studies. This research also tried to provide clarity and suggest solutions to these problems through our macro& micro-analysis.

COMPUTATIONAL FLUID DYNAMICS ANALYSIS OF NOx AND OTHER POLLUTANTS IN THE MAN B&W 7S50MC MARINE ENGINE AND EFFECT OF EGR AND WATER ADDITION

2021 ◽  
Vol 155 (A2) ◽  
Author(s):  
M I Lamas ◽  
C G Rodríguez ◽  
H P Aas
Keyword(s):  
Experimental Data ◽  
Significant Contribution ◽  
Fast Method ◽  
Dynamics Analysis ◽  
Oxides Of Nitrogen ◽  
Water Addition ◽  
Marine Engine ◽  
Computational Fluid Dynamics Analysis ◽  
Marine Engines ◽  
Global Emissions

Marine engines represent a significant contribution to global emissions. In order to overcome this problem, a great attention was given to reduce their exhaust emissions in the last years, and marine engines have to adapt to regional, national and international restrictions. In this regard, the purpose of this paper is to develop a numerical model to study NOx (oxides of nitrogen) and other pollutants in engines. EGR and water addition were studied too as measures to reduce NOx. The main advantage of this study is that it provides a cheap and fast method to analyze emissions, contrary to experimental setups which are too expensive and laborious. Particularly, a commercial marine engine was analyzed and validated with experimental data. Results showed that increasing EGR and water addition leads to reduce NOx, but increase carbon monoxide and unburnt hydrocarbons due to an incomplete combustion.

Computational Fluid Dynamics Analysis of NOx and Other Pollutants in the Man B&W 7S50MC Marine Engine and Effect of EGR and Water Addition

2013 ◽  
Vol 155 (A2) ◽  
Keyword(s):  
Experimental Data ◽  
Significant Contribution ◽  
Fast Method ◽  
Dynamics Analysis ◽  
Oxides Of Nitrogen ◽  
Water Addition ◽  
Marine Engine ◽  
Computational Fluid Dynamics Analysis ◽  
Marine Engines ◽  
Global Emissions

Marine engines represent a significant contribution to global emissions. In order to overcome this problem, a great attention was given to reduce their exhaust emissions in the last years, and marine engines have to adapt to regional, national and international restrictions. In this regard, the purpose of this paper is to develop a numerical model to study NOx (oxides of nitrogen) and other pollutants in engines. EGR and water addition were studied too as measures to reduce NOx. The main advantage of this study is that it provides a cheap and fast method to analyze emissions, contrary to experimental setups which are too expensive and laborious. Particularly, a commercial marine engine was analysed and validated with experimental data. Results showed that increasing EGR and water addition leads to reduce NOx, but increase carbon monoxide and unburnt hydrocarbons due to an incomplete combustion.

scholarly journals Contributions to the study of service characteristics of cooling water used for marine engines

2018 ◽  
Vol XIX (1) ◽  
pp. 493-501
Author(s):  
Ali L
Keyword(s):  
Corrosion Fatigue ◽  
Fuel Economy ◽  
Cooling System ◽  
Cooling Water ◽  
Auxiliary System ◽  
Marine Engine ◽  
Greenhouse Gasses ◽  
Service Characteristics ◽  
Marine Engines ◽  
Operational Issues

Even if the cooling system of a marine engine is regarded as an auxiliary system of less importance, this is absolute necessary for its operation. Recent research in advanced cooling system showed that there is a potential of greenhouse gasses reduction and fuel economy, but operational issues related to corrosion, fatigue and scale formation still remain.

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