An Experimental and Theoretical Study of the Contribution of Oil Evaporation to Oil Consumption

Yilmaz, Ertan; Tian, Tian; Wong, Victor W.; Heywood, John B.

doi:10.4271/2002-01-2684

Cited by 28 publications

(14 citation statements)

References 17 publications

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“…Lubricant degradation during engine operation was studied in [2] and the relationship between carbon deposit formation and oil consumption was presented in [4]. Several studies about the vaporization process from the cylinder liner in the combustion chamber have also been presented ( [5][6] [7]). …”

Section: Overall Phenomena Relating To Engine Oil Vaporizationmentioning

confidence: 99%

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Modeling Engine Oil Vaporization and Transport of the Oil Vapor in the Piston Ring Pack of Internal Combustion Engines

Cho

Tian

2004

SAE Technical Paper Series

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A model was developed to study engine oil vaporization and oil vapor transport in the piston ring pack of internal combustion engines. With the assumption that the multi-grade oil can be modeled as a compound of several distinct paraffin hydrocarbons, a set of equations governing the oil vapor density variations were derived by applying the mass conservation law to the amount of oil vaporized from the piston and the amount of oil vapor transported within the piston ring pack.The model was applied to a heavy-duty diesel engine. First, the case with the maximum oil supply to all the piston regions was studied and the results showed that, under this condition, the oil consumption from vaporization alone was far greater than the typical oil consumption value measured in the engine. Then, to show the contribution of oil vaporization to oil consumption and the dependence of vaporization on oil supply to different regions, different lubrication conditions for the high temperature regions of the piston were studied.Finally, a liquid oil transport model was integrated with this oil vaporization model in order to investigate the change of oil composition on the crown land with each engine cycle and the contribution of liquid-phase oil and vapor-phase oil to the total oil consumption under a fixed liquid oil supply rate to the crown land.

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Section: Overall Phenomena Relating To Engine Oil Vaporizationmentioning

confidence: 99%

“…Then discretization was made to model the engine oil as a compound of a number of paraffin hydrocarbons, as done in [7]. Twenty-one paraffin hydrocarbon components were used to span the whole spectrum of the oils with finer divisions for the light oil components since they are more volatile.…”

Section: Liquid-phase Mass Fraction and Boiling Pointmentioning

confidence: 99%

Modeling Engine Oil Vaporization and Transport of the Oil Vapor in the Piston Ring Pack of Internal Combustion Engines

Cho

Tian

2004

SAE Technical Paper Series

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“…The liner temperature increase enhances the evaporation. However, the increase in the temperatures also modifies the oil transport modes, increasing the engine total oil consumption drastically as shown in previous studies [1] [2]. Nevertheless, the scope of this study was to investigate the lube properties in the PCV blowby oil transport and does not look into the total engine consumption.…”

Section: Effect Of Cylinder Liner Temperaturementioning

confidence: 99%

“…These oil particles entrained in the gas flow, go through the separators. The particles that are larger were separated because the exerted aerodynamic drag force did not overcome the inertial forces, thus impacting the baffles [2]. Therefore, as the gas speeds were larger and the droplet sizes were smaller, particle passed by the separators and contributed to the PCV blowby oil consumption.…”

Section: Particle Size Mass Distribution Measurementsmentioning

confidence: 99%

“…Therefore there are two main sources that carry oil in liquid and vapor form to the crankcase ventilation system. The schematic for this two oil entrainment mechanism are shown in piston-ring-liner system and the As automotive engines get more powerful and small, they also run at higher operating temperatures, which increase their oil evaporation [2]. However, the increased temperature augments the engine parts thermal expansion, thus modifying the clearances between the engine parts and affecting some of the oil properties.…”

Section: List Of Tablesmentioning

confidence: 99%

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Experimental Study of Lube Oil Characteristics in the PCV System and Effects on Engine Oil Consumption

López

Tian

Wong

2004

ASME 2004 Internal Combustion Engine Division Fall Technical Conference

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Simulating the Misting of Lubricant in the Piston Assembly of an Automotive Gasoline Engine: The Effect of Viscosity Modifiers and Other Key Lubricant Components

2022

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The presence of lubricant droplets in the gas that flows through the piston assembly and crankcase of an internal combustion engine (generically termed oil misting) has important implications for performance, particularly lubricant supply to the upper piston assembly, oil consumption and lubricant degradation. A significant source of these droplets is thought to be oil shearing and blow-through by blow-by gas flows in the piston assembly. An experimental rig was developed to simulate the high velocity gas and lubricant film interactions at a top piston ring gap where the flow conditions are most severe. Flows of lubricant droplets were produced and characterised in terms of the proportion of the oil flow that formed droplets in the gas flow and the size distribution of the droplets produced. Considering various aspects of a commercial automotive crankcase formulation, the effect of lubricant viscosity was found to be particularly important. Of the lubricant additives evaluated, viscosity modifiers were found to have the greatest effect on the tendency to form droplets: Detailed study on a range of viscosity modifiers identified that the influence of their molecular architectures on viscoelasticity was the key mechanism.

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An Experimental and Theoretical Study of the Contribution of Oil Evaporation to Oil Consumption

Cited by 28 publications

References 17 publications

Modeling Engine Oil Vaporization and Transport of the Oil Vapor in the Piston Ring Pack of Internal Combustion Engines

Modeling Engine Oil Vaporization and Transport of the Oil Vapor in the Piston Ring Pack of Internal Combustion Engines

Experimental Study of Lube Oil Characteristics in the PCV System and Effects on Engine Oil Consumption

Simulating the Misting of Lubricant in the Piston Assembly of an Automotive Gasoline Engine: The Effect of Viscosity Modifiers and Other Key Lubricant Components

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