The influence of lubricating oil on deposits formation in a diesel engine under the operation condition of high power density

Abstract

The requirements of higher power density and stricter regulations on emissions of internal combustion engines lead to lubricating oil's role shifting from simply lubricating to adapting higher power density and to achieving lower emissions. An important factor influencing an engine's power and emissions is the deposits in the engine. Lubricating oil is a chief contributor to deposits formation. The objective of this paper is to investigate the influence of lubricating oil on deposits formation when the engine is operated under high power density. Metal elements content in lubricating oil and changes to power and emissions were measured to verify deposits changes. Different power densities can be achieved by adjusting the fuel supply system in the engine. Three kinds of synthesised lubricating oils were used in the investigation. The temperature of the oil pan and cooling water was strictly controlled. The experimental results demonstrated well the influence of the quality of different kinds of oil on deposits formation.

Assessing the High-Temperature Deposit Formation of Paraffinic and Naphthenic Oil Blends Using the Oil Chute Method

“…Although the formation of deposits is inevitable in gas engines operating under high temperature conditions, it needs to be minimised as much as possible. Engine oil is known to have a considerable influence on deposit formation [8], especially under high power density conditions [9]. As already reported in other contexts [10][11][12], the base oil of a lubricant plays an important role in additive expression and effectiveness, and should not be disregarded when attempting to optimise a lubricated system.…”

Research on coordination design method of main bearing assembly structure based on the maximum radial deformation of bearing bush

“…Compared with traditional diesel engines, high-speed diesel engines have the characteristics of high compactness, 1 high combustion pressure, 2 high rotation speed, 3 and wide range of use, 4 and can better adapt to the development trend of energy and power systems. In recent years, more and more scholars have focused on the design and research of high-speed diesel engines, especially the reliability, 5 performance, 6,7 and emissions 8,9 of high-speed diesel engines.…”

Mechanism of Carbonaceous Deposit Formation Caused by Lubricating Oil on High Temperature Metal Surfaces

“…leading to lubrication failure. Among the methods proposed to reduce deposits, use of optimal additives [19][20][21][22][23][24] and reduction of temperature are considered to be effective [25]. Though rarely reported, desorption of deposits from metal surfaces also needs to be addressed, as it could cause secondary damage.…”