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Author : Riadh Namouchi
Release : 1990
Genre :
Kind : eBook
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Book Synopsis Modeling of Piston Ring Dynamics, Crevice Gas Flow, and Hydrodynamic Lubrication in Internal Combustion Engines by : Riadh Namouchi
Download or read book Modeling of Piston Ring Dynamics, Crevice Gas Flow, and Hydrodynamic Lubrication in Internal Combustion Engines written by Riadh Namouchi. This book was released on 1990. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Liang Liu
Release : 2005
Genre :
Kind : eBook
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Book Synopsis Modeling the Performance of the Piston Ring-pack with Consideration of Non-axisymmetric Characteristics of the Power Cylinder System in Internal Combustion Engines by : Liang Liu
Download or read book Modeling the Performance of the Piston Ring-pack with Consideration of Non-axisymmetric Characteristics of the Power Cylinder System in Internal Combustion Engines written by Liang Liu. This book was released on 2005. Available in PDF, EPUB and Kindle. Book excerpt: (Cont.) This model predicts the inter-ring gas pressure and 3-D displacements of the three rings at various circumferential locations. Model results show significant variations of the dynamic behavior along ring circumference. In the ring-pack lubrication model, an improved flow continuity algorithm is implemented in the ring/liner hydrodynamic lubrication, and proves to be very practicable. By coupling the ring/liner lubrication with the in-plane structural response of the ring, the lubrication along the entire ring circumference can be calculated. Model results show significant variations of lubrication along the circumference due to the non-axisymmetric characteristics of the power cylinder system. Bore distortion was found to have profound effects on oil transport along the liner. Particularly, it stimulates the occurrence of oil up-scraping by the top ring during compression stroke. Because the oil evaporation on the liner affects the liner oil film thickness, a sub-model for liner evaporation with consideration of multi-species oil is incorporated with the lubrication model. With consideration of oil transport along the liner, the prediction of evaporation is more precise. The combination of these models is a complete package for piston ring-pack analysis. It is computationally robust and efficient, and thus has appreciable practical value.
Author : Yang Liu (S.M.)
Release : 2013
Genre :
Kind : eBook
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Book Synopsis Developing an Approach Utilizing Local Deterministic Analysis to Predict the Cycle Friction of the Piston Ring-pack in Internal Combustion Engines by : Yang Liu (S.M.)
Download or read book Developing an Approach Utilizing Local Deterministic Analysis to Predict the Cycle Friction of the Piston Ring-pack in Internal Combustion Engines written by Yang Liu (S.M.). This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: Nowadays, a rapid growth of internal combustion (IC) engines is considered to be a major contributor to energy crisis. About 20% of the mechanical loss in internal combustion engines directly goes to the friction loss between piston ring pack and liner finish. A twin-land oil control ring (TLOCR) deterministic model was developed by Chen et al. and it helps the automotive companies investigate the effects of liner finish, rings, and lubricants on friction and oil control of the TLOCR [2]. This work focuses on application of the TLOCR model and extension of the deterministic model to the top two rings. First, there are some practical challenges in the application of Chen's TLOCR deterministic model. Due to different wear condition on the same liner, surface roughness varies from spot to spot. A small patch of measurement cannot provide enough information and the change of plateau roughness makes the contact model unreliable. As a result, a multi-point correlation method was proposed to combine the information of different spots from the same liner and this method was shown to give better match to the experimental results. A top-two-ring lubrication cycle model was developed based on the multiphase deterministic model by Li. et al [30] and previous top-two-ring lubrication model by Chen. Et al [2][31]. The model is composed with two parts. First, the deterministic model is used to generate a correlation between the hydrodynamic pressure/friction and the minimum clearance with prescribed oil supply from the deterministic oil control ring model. It was found that within reasonable accuracy, the gas pressure effect on the hydrodynamic lubrication of the top two rings can be decoupled from the hydrodynamic lubrication. Thus, only single-phase deterministic model was needed to generate the correlation. This decoupling significantly reduces the computation time. Then, a cycle model was developed utilizing the correlation of hydrodynamic pressure/friction and the minimum clearance. The cycle model considers the effect of gas pressure variations in different ring pack regions as well as the dynamic twist of the top two rings. Finally, the models were used to examine the friction and lubrication of three different liner finishes in an actual engine running cycle.
Author : Mikhail Aleksandrovich Ejakov
Release : 1998
Genre : Internal combustion engines
Kind : eBook
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Book Synopsis Ring Pack Behavior and Oil Consumption Modeling in Ic Engines by : Mikhail Aleksandrovich Ejakov
Download or read book Ring Pack Behavior and Oil Consumption Modeling in Ic Engines written by Mikhail Aleksandrovich Ejakov. This book was released on 1998. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Fiona McClure
Release : 2007
Genre :
Kind : eBook
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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.
