Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"Oil Transport"”.
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Oil Transport in Piston Ring Assemblies
… line with the increasing requirements for lower oil consumption and friction. A test rig has been developed to simulate under idealised conditions the lubrication action between the piston-ring and the cylinder-liner in reciprocating engines. This approach attempts to separate the tribological …
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Multiphase oil transport at complex micro geometry
… Due to the sealing requirement, the minimum oil film thickness is in the order of surface roughness, which is one critical design parameter for the sealing systems. On the other hand, the wavelength of the surface geometrical features ranges from the size of the asperities of the surface …
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Modeling and simulation of oil transport and transformation for studying piston deposits
The formation of carbonaceous engine deposits is a long standing and well documented phenomenon limiting the lifetime of diesel engines. Carbon remnants coat the surfaces of the combustion chamber, piston, and valves. As piston deposits thicken, they increase the risk of a power cylinder seizure. …
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Modeling and simulation of oil transport for studying piston deposit formation in IC engines
… a three-dimensional, unsteady model of the oil film attached to a piston land was formulated. Focus was placed on the top land, in order to explore the effects of both reciprocating inertia and combustion-driven gas flows on the film's motion and thickness distribution. The numerical …
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Air flow effects in the piston ring pack and their implications on oil transport
… of piston blowby air and their influences on oil transport are studied. It is found that air mainly interacts with oil close to the ring gaps and directly below the ring-liner contacts. Geometric features at the gaps to smoothen airflow and prevent flow detachments can increase blowby mass …
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Computations and modeling of oil transport between piston lands and liner in internal combustion engines
The consumption of lubricating oil in internal combustion engines is a continuous interest for engine developers and remains to be one of the least understood areas. A better understanding on oil transport is critical to an optimization of engine designs, and advanced analytical tools are essential …
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A multi-scale model for piston ring dynamics, lubrication and oil transport in internal combustion engines
… the physical mechanisms resulting in flow of oil to the combustion chamber in order to achieve optimal designs of piston rings. The optimal design is a compromise between friction reduction and adequate gas and lubricant sealing performance. To do so a multi-scale curved beam finite element …
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Characterization of oil transport in the power cylinder of internal combustion engines during steady state and transient operation
Engine friction, wear, and oil consumption are some of the primary interests for the automotive industry. However, there is currently a lack of understanding of the fundamentals involving oil transport inside the power cylinder. Therefore, improving one area of engine performance, such as friction, …
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Modeling internal combustion engine three-piece oil control ring coupling reduced order oil transport based on neural network
… in modern automotive industry. Lubrication oil leakage contributes to particle formation and piston ring friction occupies 1/3 to 1/2 of total mechanical losses in engines. In almost all of modern gasoline engines, three-piece oil control ring (TPOCR) is used considering its low-cost and …
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A multi-scale model integrating both global ring pack behavior and local oil transport in internal combustion engines
… as ring tension reduction, may cause additional oil consumption. A compromise between reduction of friction loss and control of gas leakage and oil consumption needs to be made, which requires a deep understanding of oil transport mechanism. This compromise gives rise to the interest in modeling …
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Oil transport inside the oil control ring grove and its interaction with surrounding areas in internal combustion engines
… between reducing friction and increasing oil consumption. While friction reduces engine efficiency, oil consumption can poison exhaust aftertreatment systems. The primary method in studying the balance between friction and oil consumption is by understanding and modeling oil transport. …
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Characterization and modeling of the fundamental aspects of oil transport in the piston ring pack of internal combustion engines
Engine oil consumption is one of the primary interests for the automotive industry in controlling emissions and reducing service cost. Due to a lack of understanding of the mechanisms of oil transport along the piston, reducing oil consumption from the ring pack of internal combustion engines has …
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Developing a Data-Driven Digital Twin Model for Lubricant Oil Transport and Oil Consumption Study in Internal Combustion Engines
… is to deepen the understanding of the lubricant oil transport process in the piston ring pack system given that oil consumption is one of the major sources of engine emission. This thesis aims to develop a baseline Digital Twin model for the piston ring pack system to study oil transport and oil …
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Experimental Investigation of the Blowby Effect on the Three-Piece Oil Control Ring and Subsequent Oil Transport in Transient Engine Working Conditions
The Lubrication Oil Consumption (LOC) has been a critical issue for vehicle and engine manufactures for a long time. It can generate harmful Oil Emission (OE) as well as deteriorate the aftertreatment system. During transient engine operations, an increase of OE can be introduced but some of the …
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Development and application of a lubricant composition model to study effects of oil transport, vaporization, fuel dilution, and soot contamination on lubricant rheology and engine friction
Engine oil lubricants play a critical role in controlling mechanical friction in internal combustion engines by reducing metal-on-metal contact. This implies the importance of understanding lubricant optimization at the piston ring-cylinder liner interface. Lubricating oil composition varies along …
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Modeling piston skirt lubrication in internal combustion engines
… analysis of and development of a model for the oil transport and exchange of the piston skirt region and its surroundings. The new oil transport model is composed with two elements. First, the oil scraped into the chamfer region by the oil control ring during a down-stroke is tracked and its …
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Numerical modeling of piston secondary motion and skirt lubrication in internal combustion engines
Internal combustion engines dominate transportation of people and goods, contributing significantly to air pollution, and requiring large amounts of fossil fuels. With increasing public concern about the environment and the reliability of oil supplies, automotive companies are pushed to improve …
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An experimental study of the oil evolution in critical piston ring pack regions and the effects of piston and ring designs in an internal combustion engine utilizing two-dimensional laser induced fluorescence and the impact on maritime economics
Faced with increasing concern for lubricating, oil consumption and engine friction, it is critical to understand the oil transport mechanisms in the power cylinder system. Lubricating oil travels through distinct regions along the piston ring pack before being consumed in the combustion chamber, …
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A coupled model for ring dynamics, gas flow, and oil flow through the ring grooves in IC engines
Oil flows through ring/groove interface play a critical role in oil transport among different regions the piston ring pack of internal combustion engines. This thesis work is intended to improve the understanding and modeling capability on this important oil transport mechanism for better analysis …
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Elements of lubricant transport critical to piston skirt lubrication and to leakage into the piston ring pack in internal combustion engines
… and pollutant emissions. Understanding lubricant transport in the piston-cylinder unit is essential to this mission, due to its direct impact on both types of emissions. The first part of this thesis focuses on the development of an experimental system which allows us to visualize liquid oil …
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