scholarly journals SURVEY OF METHODS OF CALCULATING PARAMETERS OF MARINE DIESEL OPERATING CYCLE

2018 ◽  
pp. 89-100
Author(s):  
Mikhail Sergeevich Kurlenko ◽  
Alexander Aleksandrovich Budin ◽  
Aleksandr Dorokhov ◽  
Nikolay Vasilievich Selivanov
Keyword(s):  
Diesel Engines ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Thermal Design ◽  
Combustion Engines ◽  
Operating Cycle ◽  
Method Of Calculation ◽  
Marine Diesel ◽  
Operation Cycle

The need in research works on improving working process of internal combustion engines requires analyzing parameters of operation cycle. The aim of the study is to create a generalized technique for calculating the high-speed cycle diesel engines under different ways of working processes based on well-researched and reliable methodology based on using dependencies containing the general parameters of the engine performance. With the development of technology, particularly, engine manufacturing and evolution of engineering thought, by combining and add-on workflow operationalization of internal combustion engines there was received a reliable Grinevetskiy-Mazing technique of engineering calculations as a general system. Professor V.I. Grinevetskiy in his thermal design offered a pre-set temperature of residual gases Т г and cylinder filling factor ηN and gave formulas to calculate the starting compression temperature coefficient γг. The follower of V.I. Grinevetskiy, E.K. Mazing offered to evaluate the temperature of residual gases Т г and residual gas coefficient γг, and to calculate temperature of starting pressure Та and filling coefficient ηN introducing value of temperature Т′ 0 (air wormed by cylinder walls) into Grinevetskiy equation system. Today there are various software analytical complexes with different capacity (number of integrated functions), assignment (analysis, diagnostics, check calculation, design etc.), as well as basic method of calculation, which is the basic principle of the whole logic complex. Grinevetskiy-Mazing technique that has passed evolution of specifications and complements made in the course of time forms the basis of calculating method of operation cycle of marine diesel engines.

scholarly journals FULL-FLOW COMBINED BY FILTRATION AND BY CENTRIFUGATION THIN CLEANING OF MOTOR OIL IN SHIP DIESELS

2018 ◽  
pp. 62-69
Author(s):  
Gennadiy Petrovich Kicha ◽  
Liudmila Anatolievna Semeniuk
Keyword(s):  
Diesel Engine ◽  
Diesel Engines ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Engine Oil ◽  
Combustion Engines ◽  
Cleaning System ◽  
Purification System ◽  
Marine Diesel ◽  
Oil Purification

The article gives analysis of the advantages and disadvantages of cleaning engine oil in internal combustion engines by filtration and centrifugation. The principles of increasing the efficiency of fine oil purification by combining these methods are formulated. The scheme of a perspective system for fine cleaning of engine oil is presented, which most fully realizes the advantages of full-flow filtration and centrifugation for a two-circuit lubrication system of forced internal combustion engines. The operating conditions of diesel engines are shown, under which the advantages of filtration and centrifugation can be realized to the full. The indices for the specific productivity index and capacity of the centrifugal cleaner are calculated, contributing to the attainment of the minimum wear rate of the engine parts and the maximum service life of the filter elements. Prospects for the application of a full-flow fine engine oil purification system in forced engines with a sequential connection of purification units with different principles of separation of complex heterogeneous polydisperse systems, which include the products of contamination of lubrication systems, are outlined. Particularly effective is the use of the developed combined fine-cleaning system in marine diesel engines with increased rotational speed, operating on screw characteristics. The results of motor tests in the ship's trunk boosted diesels of the new combined lubrication oil fine cleaning system are reported. The results of operational tests in the marine diesel engine ДД108 (8ЧСПН 18/22) of a combined engine oil purification system have been analyzed, which combine the advantages of a full-flow filter and a centrifuge with a discharge head connected in series. The parameters of efficient regular and experienced combined engine oil cleaning system are compared with the effect on aging, wear and varnish and lacquer formation of a diesel engine.

scholarly journals Analysis of mechanical energy losses in marine diesels

2021 ◽  
Vol 5 (2(61)) ◽  
pp. 26-32
Author(s):  
Sergii Sagin ◽  
Volodymyr Madey ◽  
Tymur Stoliaryk
Keyword(s):  
Diesel Engines ◽  
Internal Combustion Engines ◽  
Structural Characteristics ◽  
Internal Combustion ◽  
Engine Oil ◽  
Lubricant Layer ◽  
Combustion Engines ◽  
Engine Oils ◽  
Boundary Lubricant ◽  
Marine Diesel

The object of research is marine diesel engine oils, which provide lubrication, cooling and separation of friction surfaces. The subject of the research is the process of ensuring minimum mechanical losses in marine diesel engines. A problematic point in ensuring the lubrication of the cylinder-piston group and motion bearings is the lack of analytical and experimental studies that establish the relationship between the structural characteristics of engine oils and mechanical losses arising in marine internal combustion engines. The degree of orientational ordering of molecules and the thickness of the boundary lubricating layer are considered as the structural characteristics of engine oils. The determination of these values was carried out using the optical method based on the anisotropy of the light absorption coefficient by the boundary lubricant layer and the isotropic volume of the liquid (engine oil). The assessment of the level of mechanical losses arising in marine diesel engines was carried out according to an indirect indicator – the overshoot of the rotational speed and the time to reach the steady state of operation in the event of a change in load. It has been experimentally established that for engine oils used in marine internal combustion engines, the thickness of the boundary layer can be 15–17.5 µm. Motor oils, which are characterized by a higher ordering of molecules and a thickness of the boundary lubricant layer, ensure the flow of transient dynamic processes with less overshoot and a shorter transient time. This ensures the level of minimal mechanical losses occurring in marine diesel engines. The technology for determining the structural characteristics of engine oils can be used for any type and grade of oil (mineral or synthetic; high or low viscosity; used in both circulating and cylinder lubrication systems). The method of indirect assessment of mechanical losses of marine diesel engines can be used for any types of internal combustion engines of ships of sea and river transport (low-, medium- and high-speed; as well as performing the functions of both main and auxiliary engines).

Nonlinear Transient Response of a High Speed Driven Valve System and Stresses in Valve Springs for Internal Combustion Engines

1989 ◽  
Vol 111 (3) ◽  
pp. 264-271 ◽  
Author(s):  
K. Nagaya
Keyword(s):  
High Speed ◽  
Internal Combustion Engines ◽  
Three Dimensional ◽  
Beam Theory ◽  
Internal Combustion ◽  
Valve Train ◽  
Combination Method ◽  
Combustion Engines ◽  
Valve System ◽  
Cam Profile

This paper presents a method for solving the dynamic response problems of a driven valve system and the stress problem of valve springs for internal combustion engines. In this system there is hysteresis behavior in the spring constants during the rotation of the cam shaft. To treat this nonlinearity, the rigidity of each section is assumed to be one of a partly linear spring. For the valve trains, the cam profile is complex in general. To treat a general cam profile, this paper applies a combination method of the Fourier expansion, the Laplace transform and the analytical connection methods, and gives a response of valve trains. This paper also presents a theoretical result for the stresses in the valve spring due to the motion of the valve train based on the three dimensional curved beam theory.

scholarly journals A zonal approach for estimating pressure ratio at compressor extreme off-design conditions

2018 ◽  
Vol 20 (4) ◽  
pp. 393-404 ◽  
Author(s):  
José Galindo ◽  
Roberto Navarro ◽  
Luis Miguel García-Cuevas ◽  
Daniel Tarí ◽  
Hadi Tartoussi ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Computational Fluid Dynamics ◽  
High Speed ◽  
Internal Combustion Engines ◽  
Pressure Ratio ◽  
Internal Combustion ◽  
Operating Conditions ◽  
Combustion Engines ◽  
One Dimensional ◽  
Performance Map

Zero-dimensional/one-dimensional computational fluid dynamics codes are used to simulate the performance of complete internal combustion engines. In such codes, the operation of a turbocharger compressor is usually addressed employing its performance map. However, simulation of engine transients may drive the compressor to work at operating conditions outside the region provided by the manufacturer map. Therefore, a method is required to extrapolate the performance map to extended off-design conditions. This work examines several extrapolating methods at the different off-design regions, namely, low-pressure ratio zone, low-speed zone and high-speed zone. The accuracy of the methods is assessed with the aid of compressor extreme off-design measurements. In this way, the best method is selected for each region and the manufacturer map is used in design conditions, resulting in a zonal extrapolating approach aiming to preserve accuracy. The transitions between extrapolated zones are corrected, avoiding discontinuities and instabilities.

scholarly journals USAGE FEATURES OF THE ELECTRONIC INDICATORS FOR SHIP’S AND SHORE POWER SUPPLY FOUR– STROKE INTERNAL COMBUSTION ENGINES (DIESEL ENGINES)

2020 ◽  
Vol 5 (4(73)) ◽  
pp. 35-41
Author(s):  
A.G. Taranin
Keyword(s):  
Diesel Engines ◽  
Power Supply ◽  
Internal Combustion Engines ◽  
Engine Performance ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Effective Pressure ◽  
Effective Power ◽  
Data Output ◽  
Shore Power Supply

The present publication illuminate the tasks as follows: Electronic indicator proper usage at four–stroke internal combustion engines (diesel engines) indication; Indication results & diagram proper transfer to PC; indicator diagram top dead center TDC correction and engine performance data output values such as PMI–mean indicated pressure, PME–mean effective pressure, NIND–indicated power and NEFF–effective power proper calculations for each cylinder and engine total.

scholarly journals SOME ASPECTS OF INFLUENCE OF THE CONNECTING ROD DESIGN ON THE OUTPUT PARAMETERS OF HIGH-SPEED INTERNAL COMBUSTION ENGINES

2020 ◽  
Vol 0 (1(86)) ◽  
Author(s):  
Сергій Олексійович Дмитрієв ◽  
Олександр Едуардович Хрулєв
Keyword(s):  
High Speed ◽  
Internal Combustion Engines ◽  
Internal Combustion ◽  
Combustion Engines ◽  
Connecting Rod
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