A Study on the Mechanism of Lubricating Oil Consumption of Diesel Engines (Third Report)~Oil Film Boundary on the Piston Skirt

2005 ◽  
Author(s):  
Masaaki Nakamura ◽  
Hirotsugu Hayashi ◽  
Akemi Ito
Keyword(s):  
Diesel Engines ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Oil Film ◽  
Piston Skirt ◽  
Film Boundary

Influence of the Position of Oil Drain Holes of a Piston on Lubricating Oil Consumption

2018 ◽  
Vol 140 (12) ◽  
Author(s):  
Hiroki Hasegawa ◽  
Koji Kikuhara ◽  
Akemi Ito ◽  
Shunsuke Nishijima ◽  
Masatsugu Inui ◽  
...  
Keyword(s):  
Piston Ring ◽  
Gasoline Engine ◽  
Pressure Sensors ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Tracer Method ◽  
Low Friction ◽  
Piston Skirt ◽  
Generation Mechanisms ◽  
Good Agreement

An increase in lubricating oil consumption in a gasoline engine causes an increase in particulate matters in exhaust gases, poisoning the catalyst after treatment devices, abnormal combustion in a turbo-charged gasoline engine, and so on. Recent trend of low friction of a piston and piston ring tends to increase in lubricating oil consumption. Therefore, reducing oil consumption is required strongly. In this study, the effect of the position of oil drain holes on oil pressure under the oil ring and lubricating oil consumption was investigated. The oil pressure under the oil ring is measured using fiber optic pressure sensors and pressure generation mechanisms were investigated. Lubricating oil consumption was also measured using sulfur tracer method and the effects of oil drain holes hence the oil pressure were evaluated. Four types of arrangement of oil drain holes were tested. The oil pressure variations under the oil ring in the circumferential direction was measured. An increase in oil pressure was found during down-stroke of the piston. The lowest oil pressure was found for the piston with four oil drain holes. Two holes nearby the front/rear end of the piston skirt showed relatively lower pressure. The measured results of oil consumption showed good agreement to measured oil pressure under the oil ring. It was found that oil pressure under the oil ring affected oil consumption, and oil drain holes set near the front/rear end of the piston skirt were effective for reducing oil consumption.

scholarly journals Development of a new visualization technique using photochromism for transport process of lubricating oil around the engine piston

2018 ◽  
Vol 20 (7) ◽  
pp. 777-787 ◽  
Author(s):  
Akihiko Azetsu ◽  
Ikkei Kitajima ◽  
Kazaki Kuratsuji
Keyword(s):  
Energy Density ◽  
Flow Visualization ◽  
Ultraviolet Light ◽  
Lubricating Oil ◽  
Oil Consumption ◽  
Oil Film ◽  
Before And After ◽  
Color Fading ◽  
Color Density ◽  
Photochromic Reaction

This study proposes and experimentally validates a new method for the visualization of oil film flow. A photochromic dye is dissolved in the oil and an arbitrary spot of an oil film is illuminated with ultraviolet light, which makes a marker in the oil film via a photochromic reaction. The basic principle of the photochromic reaction and its application to flow visualization are described. The color density of the colored solution is quantified based on the absorbance calculated from images taken before and after coloring. The results confirm that the color density is proportional to the oil film thickness. The color density changes sufficiently slowly at room temperature to make it suitable as a marker for flow visualization. The characteristics of the coloring and fading reactions are examined. The results confirm that increase in the energy density of the ultraviolet light effectively increases the color density and that the optimal energy density of the ultraviolet light can be determined from a model formula for the coloring reaction. The color fading reaction at different temperatures is measured, and the temperature dependence of a solution of spiropyran and ester oil is quantified using an Arrhenius plot. Flow visualization is conducted in a 10- μm-thick flow channel with a complex shape. The test oil flowing through this channel is colored by the focused third harmonic of an Nd:YAG laser, and the flow velocity distribution is visualized using the proposed method. Finally, for experimental validation, the proposed method is used to visualize the movement of an oil film on the piston land of an optical engine. The proposed technique can be applied to investigate the dominant route of oil consumption and the physics involved.

scholarly journals Determination of diesels lubricating oil consumption norms taking into account innovative technology of regeneration on ships

2020 ◽  
Vol 2020 (2) ◽  
pp. 81-91
Author(s):  
Dmitry Konstantinovich Glazyk ◽  
Vladimir Viktorovich Manitsyn ◽  
Rafail Ravilevich Simashov
Keyword(s):  
Diesel Engines ◽  
Operating Time ◽  
Operating Mode ◽  
Nonlinear Dependence ◽  
Lubricating Oil ◽  
Innovative Technology ◽  
Oil Consumption ◽  
Characteristic Mode ◽  
The Cost ◽  
Motor Oils

The article considers the current methods of calculating norms of lubricating oil consumption by marine diesels that provide for three causes of oil loss: oil burning, evaporation rate, and replacement expense. According to the manual, the lubricating oil consumption for replacement is considered only in trunk diesel engines; in main crosshead diesel engines with capacity over 3000 kW it is not considered and not performed. The lubricating oil consumption norms are proposed to carry out in terms of burnout and evaporation, according to the methods of determining fuel consumption norms. To determine consumption norms, it is necessary to know the oil consumption characteristic in relation to the load of the diesels and the load distribution in the ship operating mode. In the low speed crosshead diesel engines the circulating oil is only consumed for evaporation, but the trunk diesel engines consume oil for evaporation, burnout and replacement. The diagram of dependence of the relative cylinder oil consumption on the relative load of the diesel engine in the helical characteristic mode is illustrated. A simplified technological scheme of low-tonnage regeneration of the used motor oils is presented. It is proposed to calculate the oil consumption by the lubrication pump according to a nonlinear dependence based on the speed of the crankshaft at a specific mode. The analysis of the evaporation and burnout is recommended to carry out using a linear relationship, subject to oil consumption in the idle mode. The cost of circulating oil replacement is recommended to calculate according to the diesel operating time. Application of the used lubricating oil regeneration by means of a ship small-sized plant allows to achieve the oil consumption reduction by 19-48% depending on the ship operating mo

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