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Author :
Release : 2000
Genre :
Kind : eBook
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Book Synopsis Development of a Numerical Model of Piston Secondary Motion for Internal Combustion Engines by :
Download or read book Development of a Numerical Model of Piston Secondary Motion for Internal Combustion Engines written by . This book was released on 2000. Available in PDF, EPUB and Kindle. Book excerpt: By Conor P. McNally.
Author : Conor Peter McNally
Release : 2000
Genre :
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Book Synopsis Development of a Numerical Model of Piston Secondary Motion for Internal Combustion Engines by : Conor Peter McNally
Download or read book Development of a Numerical Model of Piston Secondary Motion for Internal Combustion Engines written by Conor Peter McNally. This book was released on 2000. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Fiona McClure
Release : 2007
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Book Synopsis Numerical Modeling of Piston Secondary Motion and Skirt Lubrication in Internal Combustion Engines by : Fiona McClure
Download or read book Numerical Modeling of Piston Secondary Motion and Skirt Lubrication in Internal Combustion Engines written by Fiona McClure. This book was released on 2007. Available in PDF, EPUB and Kindle. Book excerpt: 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 engine design in order to reduce engine emissions and fuel consumption. This project aims to develop a numerical model of piston dynamics and lubrication in internal combustion engines, enabling prediction of friction generation at the piston -cylinder bore interface, and oil transport in the power cylinder system. It is currently estimated that the piston - cylinder bore friction accounts for up to 25% of the power loss in a typical engine, while oil transported to the combustion chamber by the piston and ring-pack contributes significantly to engine emissions. A dry piston model was first developed to allow fast calculation of approximate piston dynamics. An elastohydrodynamic lubrication model was then developed to allow direct numerical simulation of the effect of piston tooling marks, and comparison with results obtained using an Average Reynolds equation with flow factors. The lubrication model was incorporated into the piston dynamics model, enabling more accurate evaluation of friction and oil transport. Comparison between the dry and lubricated model results demonstrate the effect of oil film thickness on piston lateral motion, tilt, friction generation and oil transport.
Author : Andreas Petrou Panayi
Release : 2009
Genre : Automobiles
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Book Synopsis Numerical Models for the Assessment of the Cylinder-kit Performance of Four-stroke Internal Combustion Engines by : Andreas Petrou Panayi
Download or read book Numerical Models for the Assessment of the Cylinder-kit Performance of Four-stroke Internal Combustion Engines written by Andreas Petrou Panayi. This book was released on 2009. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Dongfang Bai (Ph. D.)
Release : 2012
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Book Synopsis Modeling Piston Skirt Lubrication in Internal Combustion Engines by : Dongfang Bai (Ph. D.)
Download or read book Modeling Piston Skirt Lubrication in Internal Combustion Engines written by Dongfang Bai (Ph. D.). This book was released on 2012. Available in PDF, EPUB and Kindle. Book excerpt: Ever-increasing demand for reduction of the undesirable emissions from the internal combustion engines propels broader effort in auto industry to design more fuel efficient engines. One of the major focuses is the reduction of engine mechanical losses, to which the friction of the piston skirt is one important contributor. Yet there lacks a sufficient understanding of the skirt lubrication behavior to effectively optimize the piston skirt system in practice. The ultimate goal of this work is to develop a comprehensive model to advance the predictability of the skirt friction while integrating all the dynamic behavior of the piston secondary motion and the structural deformation of the piston skirt and cylinder liner. Major contributions of this work are 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 accumulation and release to the skirt region are modeled. Second, oil separation and re-attachment are allowed in the skirt region, breaking conventional full-attachment assumption in lubrication studies. The new oil transport model together with hydrodynamic and boundary lubrication model were coupled with piston secondary motion and structural deformation of the piston skirt and cylinder liner. For numerical efficiency and physics clarity, we used different discretization for the lubrication from the structural deformation. The final model is robust and efficient. The discussion of the model results is focused mainly on the oil transport. There exist a general pattern in available oil for skirt lubrication, namely, skirt tends to be starved when it travels at the upper portion of a stroke. Comparison with visualization experiment for oil accumulation patterns show consistency between model prediction and observation. This work represents a major step forward to realistically predicting skirt friction and the influence of all the relevant design and operational parameters. However, oil supply to the region below the piston skirt can largely influence the outcome of the friction prediction and its mechanism is system dependent. Additionally, simple treatment of the oil transport in the current model is merely a first step to modeling the complex fluid problems involved. Improvements of this model based on application and further analysis will make it a more powerful engineering tool to optimize the skirt system to minimize its undesirable outputs.
