STRATIFICATION OF VISCOSITY OF ENGINE OIL WITH BOUNDARY AND HYDRODYNAMIC LUBRICATION OF THE CYLINDER PISTON GROUP OF MARINE LOW-SPEED DIESEL ENGINES

2015 ◽  
Keyword(s):  
Diesel Engines ◽  
Hydrodynamic Lubrication ◽  
Engine Oil ◽  
Low Speed ◽  
Piston Group ◽  
Cylinder Piston

scholarly journals Research and development of commercially viable lubricants to intensify working life of marine diesel engines and cylinder piston group in internal combustion engines

2021 ◽  
Vol 2021 (4) ◽  
pp. 62-74
Author(s):  
Vasiliy Aleksandrovich Chanchikov ◽  
Ivan Nikolaevich Guzhvenko ◽  
Alexandr Ivanovich Andreev ◽  
Marina Aleksandrovna Shulimova ◽  
Sergey Aleksandrovich Svekolnykov
Keyword(s):  
Diesel Engines ◽  
Engine Oil ◽  
Lubricating Oil ◽  
Mechanical Mixing ◽  
Friction Modifier ◽  
Marine Engine ◽  
Piston Group ◽  
Molybdenum Diselenide ◽  
Marine Diesel ◽  
Cylinder Piston

The paper presents the results of studying the influence of variable characteristics of lubricating oils for marine diesel engines (concentration of layered friction modifier in lubricating oil, viscosity of lubricating oil, contact pressure in the friction zone) on the tribological parameters of parts of the cylinder-piston group of marine diesel engines. There are considered the aspects of increasing the reliability and wear resistance of the cylinder-piston group of marine diesel engines when a layered friction modifier is added to the base lubricating oil in a concentration of 1.5 vol.%. There have been carried out the comparative tribological studies of M-16G2CS lubricating oil including an additive based on molybdenum diselenide. Dependences of the wear of parts of the cylinder-piston group of a marine engine on different parameters of the studied lubricants are shown. The wear rate of experimental samples in conditions of variable characteristics of lubricants has been studied. According to the tribological studies of lubricants and structural materials, the tribological rating of lubricating compositions containing M16G2CS marine engine oil as a base and a layered friction modifier - molybdenum diselenide as a tribologically active additive was built. The test tool for the antiwear ability of lubricants is a friction machine of an original design with abraded samples according to the “ball-cylinder” contact scheme. Mechanical mixing of the lubricating medium of “oil + additive” type on the RPU-0.8-55A rotary-pulsating unit was one of the variable parameters in the tests. The tribological efficiency of the studied antiwear additive varies depending on the type of mixing of the additive solution before adding to the base lubricating oil and makes 13-54% (the difference in the diameter of the wear spot of the sample) for mechanical mixing, and for rotary-pulsation mixing - 45-56%.

scholarly journals Diagnosing the technical condition of the diesel cylinder-piston group

2021 ◽  
Vol 264 ◽  
pp. 04061
Author(s):  
Mukhammad Valiev ◽  
Khusan Kosimov
Keyword(s):  
Diesel Engines ◽  
Objective Assessment ◽  
Technical Condition ◽  
Working Process ◽  
Piston Group ◽  
Cylinder Piston ◽  
Diesel Cylinder ◽  
Integral Assessment ◽  
Locomotive Diesel

The reliability of locomotive diesel engines largely depends on a timely and objective assessment of the technical condition of its equipment during operation. The article proposes a technique for the integral assessment of the technical state of the quality of the working process in a diesel cylinder using on-board diagnostics.

scholarly journals EFFECT OF WASTE ENGINE OIL ON AGEING INTENSITY IN A MARINE DIESEL ENGINE WITH HIGH BOOST

2019 ◽  
pp. 71-77
Author(s):  
Liudmila Anatolievna Semeniuk ◽  
Maxim Igorevich Tarasov
Keyword(s):  
Diesel Engine ◽  
Engine Oil ◽  
Experiment Planning ◽  
Specific Rate ◽  
Motor Oil ◽  
Waste Engine Oil ◽  
Piston Group ◽  
The Matrix ◽  
Marine Diesel ◽  
Cylinder Piston

The key directions of the oil aging process are closely interrelated with its fumes and this is once again confirmed by the motor experiment. The degree of oxidation of the engine oil subjected to identification by increasing the concentration of insoluble impurities identifies the thermo-oxidative destruction of the present hydrocarbons. The results of modeling the process of wear of parts of the cylinder-piston group of marine diesel are considered. Through the application of the theory of experiment planning, the range of minimum wear is revealed, the dependence is focused on the values of the quality indicators of the used fuels and lubricants, the engine boost and the amount of engine oil burn. The change in the values in the main directions of oil aging as a result of reducing its fumes was noted. There has been revealed engine oil burnout in which the operation of the diesel engine is accompanied by less carbon and varnish formation on its pistons and the wear rate of the elements of the cylinder-piston group, the engine oil being in excellent condition in terms of the composition of aging products. Oil aging rate is determined at each stage of trial, according to sample analysis. There is given the matrix of experiment planning, as well as results of its processing. There are established the equations usable in trunk diesel operation that help to analyze general and specific rate of motor oil ageing, the initial values being values of oil waste, properties of fuels and lubricants and engine forcing. Motor oil of М-14-Г2 grade (circulating system) has been recommended to use for efficient and durable operation of ship diesels with average and low boost. For high powered engines operating on deep refining fuels it is possible to use the following oil grades: М-14-Д2 (cl 20) и М-14-Д2 (cl 30) with high neutralizing and motor qualities.

scholarly journals THE CONCEPT OF COMBUSTION PROCESS ORGANISATION IN A BOXER TWO-STROKE DIESEL ENGINE AT A HIGH LEVEL OF BOOSTING

2021 ◽  
pp. 45-51
Author(s):  
I.V. Parsadanov ◽  
A.G. Lal
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Fuel Efficiency ◽  
Combustion Process ◽  
Mixing Efficiency ◽  
Diesel Generator ◽  
Piston Group ◽  
Air Supply ◽  
Cylinder Piston ◽  
High Level

Based on the analysis and synthesis of previously performed theoretical and practical studies, the paper proposes a concept of combustion process organization in a boxer two-stroke diesel engine at a high level of boosting. Such diesel engines are produced in Ukraine and are widely used in land, sea and rail transport, as diesel generator plants. The implementation of this concept will ensure the reduction of the thermal stress of the cylinder piston group for these diesel engines, while improving fuel efficiency. The features of the organization of the working process in a boxer two-stroke diesel engine are briefly considered. The contribution of Ukrainian, Russian and American scientists to the development and improvement of their mixing efficiency is noted. Following the purpose of the research, which determines the choice of directions for the development and implementation of technical solutions for the simultaneous reduction of fuel consumption and thermal tension of the cylinder-piston group when forcing a boxer two-stroke diesel engine, it is proposed to use the amount of released heat as a criterion for evaluating the quality of combustion. Based on the results of earlier studies, conceptual foundations for increasing the efficiency of the combustion process of a highly boosted boxer two-stroke diesel engine have been developed, which are directly related to the air supply, fuel supply, the rationale for choosing the shape of the combustion chamber are determined by the amount of heat released during combustion and the nature of its change in the crankshaft rotation angle.

scholarly journals Cordunum pistons increase diesel engine economy and reliability

2019 ◽  
pp. 28-37
Author(s):  
Andriy Marchenko ◽  
Volodymyr Shpakovskyy ◽  
Volodymyr Volikov
Keyword(s):  
Diesel Engine ◽  
Fuel Consumption ◽  
Diesel Engines ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Ceramic Coatings ◽  
Fuel Combustion ◽  
Combustion Engines ◽  
Piston Group ◽  
Cylinder Piston

Taking into account the oil resources depletion the requirements to fuel consumption of internal combustion engines are now increasing as well as to their reliability and durability. With the continual increase in the number of internal combustion engines in operation, along with the problem of parts of the cylinder piston group wearing out has caused exhaust from such engines to be one of the main source of harmful pollutant emissions in cities. Therefore, environmental requirements have in turn increased dramatically. The engine resource and its efficiency largely depend on the process of fuel combustion in the combustion chamber. Experimental studies aimed to improve the working process on diesel engines by piston insulation have shown an effective decrease in fuel consumption by reducing heat loss and more complete fuel combustion. When oxide ceramic coatings were used on the piston and cylinder head, the maximum power increased and the specific fuel consumption decreased. However ceramic coatings are not widely used due to their peeling. We have developed a technology for the galvanic plasma treatment of pistons, which made it possible to obtain on the pistons surface made of aluminum alloys a ceramic corundum layer with high adhesion to the base metal that does not peel and has electret properties. In 1993, pistons with a corundum surface layer were installed in a shunting diesel locomotive and life-time running tests were conducted. Such pistons increased wear resistance, reduced the wear of cylinder liners, increased the strength of the annular jumpers, and were not prone to burnouts and scuffing. They provided an increase in the resource of the cylinder-piston group of the diesel engine by more than 125 thousand engine hours. The paper provides an analysis of the effect of corundum pistons thermal insulation on significant increasing the, engine power and fuel consumption reduction. Basing on experimental bench studies of a gasoline engine, a tractor diesel engine and long-term operational life tests of diesel engines, an attempt had been made to explain the reasons for the improvement in the engines’ efficiency.

scholarly journals Transient tribo-dynamic analysis of crosshead slipper in low-speed marine diesel engines during engine startup

Friction ◽  
2020 ◽  
Author(s):  
Rui Li ◽  
Xianghui Meng ◽  
Jingjin Dong ◽  
Wenda Li
Keyword(s):  
Diesel Engines ◽  
Dynamic Models ◽  
Hydrodynamic Lubrication ◽  
Friction Pair ◽  
Connecting Rod ◽  
Low Speed ◽  
Marine Diesel ◽  
Dynamic Performances ◽  
Guide System ◽  
Startup Process

Abstract A crosshead slipper-guide system, which bears a significant thrust force, is an essential friction pair in low-speed marine diesel engines. Owing to the low moving speed of the crosshead slipper during engine startup, it is difficult to form good hydrodynamic lubrication between the crosshead slipper and guide. Therefore, a detailed analysis of the crosshead slipper during engine startup is needed. In this study, a new transient tribo-dynamic model for a crosshead slipper during the engine startup process is presented. The model consists of a mixed lubrication model of the crosshead slipper-guide and dynamic models of the piston assembly, crosshead assembly, connecting rod, and crankshaft. The tribo-dynamic performances of the crosshead slipper during startup and under the rated conditions were simulated and compared. The results show that the tribo-dynamics of the crosshead slipper during the startup process are significantly different from those under the rated conditions. Some measures beneficial for the low friction of a crosshead slipper-guide under the rated conditions may significantly increase the friction loss of the crosshead slipper-guide system during the startup process.

scholarly journals Исследование расхода масла автотракторными двигателями

2020 ◽  
Author(s):  
B.S. Antropov ◽  
V.V. Gumenniy ◽  
V.V. Kapralov ◽  
V.A. Generalov
Keyword(s):  
Free Market ◽  
Engine Oil ◽  
Motor Oil ◽  
Oil Consumption ◽  
Piston Cylinder ◽  
Piston Group ◽  
Crankcase Oil ◽  
Cylinder Piston ◽  
Tractor Equipment ◽  
Factory Standard

В условиях рыночной экономики автотранспорт является основным по перевозке грузов. К нему предъявляются серьёзные требования как по надёжности, так и по экономичности, в частности по расходу топлива и картерного масла двигателей. Рассмотрены вопросы по определению расхода масла двигателя. Установлено, что под расходом масла автотранспортных двигателей понимается его долив от замены до замены. Долив масла до нормы связан с угаром в процессе эксплуатации автотракторной техники. Установлено, что расход масла является величиной переменной, возрастающей по мере увеличения пробега двигателя, вследствие износа деталей цилиндропоршневой группы ДВС. Определено также, что при предельном расходе масла, составляющим тройное увеличение заводского норматива для новых двигателей (перед запуском их в эксплуатацию), эксплуатация должна быть прекращена по экономическим соображениям. Как правило, в данном случае на двигателях заменяются детали цилиндропоршневой группы (поршни, гильзы и поршневые кольца). Расход масла на долив используется и для диагностирования двигателей, а именно по его значению можно определить состояние деталей цилиндропоршневой группы. Авторами приведены методы углублённого диагностирования с целью определения цилиндров, имеющих неисправности.Under free market conditions motor transport is the main transport of goods. Serious requirements are applied to it both in terms of reliability and efficiency in particular for fuel consumption and crankcase oil for engines. The issues of determining the engine oil consumption are considered. It was also established that the consumption of motor oil is understood as topping it up from replacement to replacement. Topping up the oil to normal is associated with burning while in operation of motor-and-tractor equipment. It has been established that oil consumption is a variable increasing as the engine mileage increases due to the wear of parts of the cylinder-piston ICE group. It is determined that with a maximum oil consumption amounting to a triple increase in the factory standard for new engines (before putting them into operation) operating should be stopped for economic reasons. As a rule in this case parts of the cylinder-piston group (pistons, sleeves and piston rings) are replaced on the engines. Oil consumption for topping up is also used to diagnose engines, namely by its value it is possible to determine the condition of parts of the piston-cylinder group. The methods of in-depth diagnosis in order to identify cylinders with malfunctions are presented by the authors.

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