Effect analysis on energy efficiency enhancement of controlled cylinder liner temperatures in marine diesel engines with model based approach

2020 ◽  
Vol 220 ◽  
pp. 113015 ◽  
Author(s):  
Caglar Dere ◽  
Cengiz Deniz
Keyword(s):  
Energy Efficiency ◽  
Diesel Engines ◽  
Cylinder Liner ◽  
Efficiency Enhancement ◽  
Effect Analysis ◽  
Model Based ◽  
Marine Diesel

scholarly journals The Computing Methods for CO2 Emissions in Maritime Transports

2016 ◽  
Vol 22 (3) ◽  
pp. 622-627
Author(s):  
Doru Coşofreţ ◽  
Marian Bunea ◽  
Cătălin Popa
Keyword(s):  
Energy Efficiency ◽  
Diesel Engines ◽  
Greenhouse Effect ◽  
Global Climate ◽  
Computing Methods ◽  
Point Of View ◽  
Maritime Transportation ◽  
Exhaust Gases ◽  
Global Climate Changes ◽  
Marine Diesel

Abstract Nowadays the global climate changes have determined the international bodies to take measures in order to reduce emissions that contribute to the greenhouse effect. The main component of the exhausting gases produced by diesel engines is the CO2 emissions, considered responsible for the greenhouse effect appearance. The CO2 occurrence is largely dependent on the fuel carbon content as used in the diesel engines and further on the fuel consumption. In this context, it is worthwhile considering the maritime transportation activities taking place since 2011 when IMO took steps to reduce the emissions of CO2 from the exhaust gases of marine diesel engines on ships, enforcing their energy efficiency standards. This paper presents a summary of the main methods for determining the CO2 masses from the exhaust gases of marine diesel engines. These computation methods highlight usage opportunities from the sustainable management principles point of view, promoting the concept of energy efficiency onboard the ships. The undertaken researches open new perspectives in regulation framework, offering new tools for GHG ship emissions’ monitoring and evidence.

scholarly journals Contributions to the study of service characteristics of marine fuels

2018 ◽  
Vol XIX (1) ◽  
pp. 502-508
Author(s):  
Ali L
Keyword(s):  
Fuel Consumption ◽  
International Organizations ◽  
Diesel Engines ◽  
Fuel Injection ◽  
Cylinder Liner ◽  
Operating Mode ◽  
Service Characteristics ◽  
Marine Engines ◽  
Marine Diesel ◽  
A Priority

Since the beginning, development of marine diesel engines was turned towards obtaining a low fuel consumption and the result has reflected in engines construction: increased bore and cylinder liner diameter, higher working pressures and lower piston speeds. Similar improvements have taken place in the supercharging system, innovative fuel injection technologies and changes in combustion pressures. Nowadays, the trend of development has changed, the concept of reducing NOx and SOx emissions became a priority in order to meet the limits imposed by international organizations. As a consequence, a series of changes in operating mode of marine engines was noticed but also several innovations appeared in the construction and development of marine engines.

scholarly journals Oil Film Formation between Piston Rings and Cylinder Liner of Slow-Speed Marine Diesel Engines

1994 ◽  
Vol 29 (3) ◽  
pp. 261-267
Author(s):  
Keijiro Tayama ◽  
Kazuhiko Maekawa ◽  
Keizo Gotoh ◽  
Noriyasu Inenaga
Keyword(s):  
Diesel Engines ◽  
Film Formation ◽  
Cylinder Liner ◽  
Slow Speed ◽  
Piston Rings ◽  
Oil Film ◽  
Marine Diesel

scholarly journals Structural Modifications for Improving the Tribological Properties of the Cylinder Unit in Two-stroke Slow Speed Marine Diesel Engines

2012 ◽  
Vol 1 (2) ◽  
pp. 89-95 ◽  
Author(s):  
Branko Lalić ◽  
Ivan Komar ◽  
Đorđe Dobrota
Keyword(s):  
Diesel Engines ◽  
Cylinder Liner ◽  
Slow Speed ◽  
Structural Modifications ◽  
Engine Efficiency ◽  
Maritime Shipping ◽  
Tribological System ◽  
Marine Propulsion ◽  
Marine Diesel ◽  
Engine Components

Increasing the energy efficiency of the marine propulsion systems currently represents one of the priorities that have been placed in front of all subjects of maritime shipping market. More and more ship owners aspired to larger and more powerful diesel engines demanded from the marine engine manufacturers to implement various technological modifications to increase the engine efficiency, extend the life of engine components, and thus prolonge regular overhauling period of them. One of the way to meet these demands, among other things, is to improve the tribological characteristics of engine components. The aim of this paper is to present structural modification of tribological system “cylinder liner - piston ring - piston” of large bore slow speed marine diesel engine to reduce friction problems in mentioned system.

OPERATIONAL EVALUATION OF PISTON-RINGS-CYLINDER LINER ASSEMBLY WEAR IN HIGH POWER MARINE DIESEL ENGINES

Tribologia ◽  
2018 ◽  
Vol 271 (1) ◽  
pp. 5-15
Author(s):  
Adam ADAMKIEWICZ ◽  
Jan DRZEWIENIECKI
Keyword(s):  
High Power ◽  
Diesel Engines ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Technical Condition ◽  
Piston Rings ◽  
Protective Layers ◽  
Marine Diesel ◽  
Source Of Information ◽  
Operational Methods

This paper presents an operational evaluation of piston-piston rings-cylinder liner (PRC) assembly wear in marine diesel engines of high power. It is based on visual inspection through cylinder liner scavenge ports. Clearance measurements of piston rings in piston grooves and piston ring gap measurements were used to evaluate the extent of wear of the PRC assembly. Moreover, it is shown that piston ring gap measurements can be used as a reference parameter in wear trend analysis to predict the length of time periods between overhauls (TBO). Furthermore, it has been shown that controlling the wear of chromium (protective) layers of piston ring working surfaces by measuring their thickness with induction and eddy current methods is highly useful. They were accepted as a source of information on PRC lubrication correctness and as a symptom of its technical condition. Factors indicating the necessity of an overhaul and introducing operational methods of improving working conditions between the tribological pair – liner and piston rings have been determined.

Optimization of cylinder liner macro-scale surface texturing in marine diesel engines based on teaching–learning-based optimization algorithm

2020 ◽  
pp. 135065012091156
Author(s):  
Salaheldin A Mohamad ◽  
Mohamed A Kamel
Keyword(s):  
Friction Force ◽  
Optimization Algorithm ◽  
Diesel Engines ◽  
Surface Texturing ◽  
Cylinder Liner ◽  
Oil Film ◽  
Macro Scale ◽  
Marine Diesel ◽  
Teaching Learning Based Optimization ◽  
Teaching Learning

This paper investigates the effect of optimum macro-scale cylinder liners oil groove on the tribological behavior of large bore marine diesel engines. Parabolic bottom shape grooves are selected as the cylinder liner surface texturing. The grooves have been distributed along the stroke in the form of array of circumferential cells with the axial groove centered in each cell. Teaching–learning-based optimization algorithm is applied to get the optimum dimensions of oil grooves, where the objective is to minimize the cyclic average total friction force between the top compression piston ring and the cylinder liner. Numerical simulation based on Reynolds equation is presented to study the effect of optimum grooves’ dimensions on tribological parameters such as hydrodynamic friction, asperity contact pressure, and hydrodynamic oil film pressure. Results showed that the optimum dimensions oil grooves have a significant effect on the total friction force and the cavitation pressure of the oil film.

Improving Tribological Behavior of 2-Stroke Marine Diesel Engine Piston Ring by Cylinder Liner Surface Texturing

2014 ◽  
Vol 620 ◽  
pp. 278-284 ◽  
Author(s):  
Salaheldin A. Mohamad ◽  
Qun Zheng ◽  
Xi Qun Lu
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Piston Ring ◽  
Surface Texturing ◽  
Cylinder Liner ◽  
Hydrodynamic Effect ◽  
Micro Scale ◽  
Macro Scale ◽  
Marine Diesel ◽  
Piston Ring Lubrication

Piston ring lubrication in some types of low-speed 2-stroke marine diesel engines is completely different from those in medium-or high-speed diesel engines since the inner surface of cylinder liners are textured with circular grooves in macro-scale and honing texture in micro-scale. In this paper, a numerical model has been developed to study the potential of use of cylinder bore surface texturing, in the form of circumferential oil grooves with different dimensions and densities, and their efficiency to improve the tribological properties of piston ring-cylinder liner tribo-system. The average Reynolds equation has been employed in the area of micro-scale texture and the effect of macro-scale grooves has been incorporated to improve the currently lubrication model. The results showed that the cylinder liner oil grooves can efficiently be used to maintain hydrodynamic effect. It is also shown that optimum surface texturing may substantially reduce the friction losses between piston ring and cylinder liner.

scholarly journals Actual Wear Condition of Cylinder Liner and Piston Ring on Recent Low Speed Marine Diesel Engines

1995 ◽  
Vol 30 (3) ◽  
pp. 248-258
Author(s):  
Hiroyuki Ide ◽  
Yuji Tsutsumi ◽  
Seimei Arai ◽  
Takaaki Inoue
Keyword(s):  
Diesel Engines ◽  
Piston Ring ◽  
Cylinder Liner ◽  
Low Speed ◽  
Marine Diesel ◽  
Wear Condition
Sign in / Sign up

Export Citation Format

Share Document