Share

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

2004
Download Modeling Engine Oil Vaporization and Transport of the Oil Vapor in the Piston Ring Pack on Internal Combustion Engines PDF Online Free

Author :
Release : 2004
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Modeling Engine Oil Vaporization and Transport of the Oil Vapor in the Piston Ring Pack on Internal Combustion Engines by : Yeunwoo Cho

Download or read book Modeling Engine Oil Vaporization and Transport of the Oil Vapor in the Piston Ring Pack on Internal Combustion Engines written by Yeunwoo Cho. This book was released on 2004. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Computations and Modeling of Oil Transport Between Piston Lands and Liner in Internal Combustion Engines

2014
Download Computations and Modeling of Oil Transport Between Piston Lands and Liner in Internal Combustion Engines PDF Online Free

Author :
Release : 2014
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Computations and Modeling of Oil Transport Between Piston Lands and Liner in Internal Combustion Engines by : Tianshi Fang

Download or read book Computations and Modeling of Oil Transport Between Piston Lands and Liner in Internal Combustion Engines written by Tianshi Fang. This book was released on 2014. Available in PDF, EPUB and Kindle. Book excerpt: 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 to the achievement of reduced frictions without compromising oil consumption. Oil transport from piston lands to a liner, hereafter called "bridging", has been observed in engine tests. The additional oil transferred to the liner becomes a potential source of oil consumption through ring-liner interaction. Thus, it is important to develop more quantitative models to better analyze bridging. The objective of this work is to obtain a more in-depth understanding on the oil transport between piston lands and liner and provide quantitative models of the oil transport mechanisms. Multiphase Computational Fluid Dynamics (CFD) was employed together with analyses of experimental observations. Three categories of bridging were identified: assisted bridging, self-sustained bridging, and reverse bridging. While assisted bridging involves an axial oil flow across an entire piston land, the other two phenomena are localized and become prominent at low engine speeds. The mechanisms of each phenomenon were analyzed in this work. Correlations and theoretical models were developed to associate the risk of bridging with geometrical designs of a piston and operating conditions of an engine. Particularly, the theoretical model of self-sustained bridging contributes to the optimization of geometrical designs of the third land of a piston ring pack. This work constitutes a major step towards a further quantification of oil transport. Some findings and models presented in this work can readily contribute to providing optimal solutions to certain piston regions. Furthermore, the results of this work serve broader purposes in providing boundary conditions to other interactions in a piston ring pack.

Oils, Rheology, Tribology, and Driveline Fluids

2004 Automobiles
Download Oils, Rheology, Tribology, and Driveline Fluids PDF Online Free

Author :
Release : 2004
Genre : Automobiles
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


Book Synopsis Oils, Rheology, Tribology, and Driveline Fluids by :

Download or read book Oils, Rheology, Tribology, and Driveline Fluids written by . This book was released on 2004. Available in PDF, EPUB and Kindle. Book excerpt:

Synthetics, Mineral Oils, and Bio-Based Lubricants

2020-01-29 Science
Download Synthetics, Mineral Oils, and Bio-Based Lubricants PDF Online Free

Author :
Release : 2020-01-29
Genre : Science
Kind : eBook
Book Rating : 736/5 ( reviews)

GET EBOOK


Book Synopsis Synthetics, Mineral Oils, and Bio-Based Lubricants by : Leslie R. Rudnick

Download or read book Synthetics, Mineral Oils, and Bio-Based Lubricants written by Leslie R. Rudnick. This book was released on 2020-01-29. Available in PDF, EPUB and Kindle. Book excerpt: Highlighting the major economic and industrial changes in the lubrication industry since the first edition, Synthetics, Mineral Oils, and Bio-Based Lubricants: Chemistry and Technology, Third Edition highlights the major economic and industrial changes in the lubrication industry and outlines the state of the art in each major lubricant application area. Chapters cover the use of lubricant fluids, growth or decline of market areas and applications, potential new applications, production capacities, and regulatory issues, including biodegradability, toxicity, and food production equipment lubrication. The highly-anticipated third edition features new and updated chapters including those on automatic and continuously variable transmission fluids, fluids for food-grade applications, oil-soluble polyalkylene glycols, functional bio-based lubricant base stocks, farnesene-derived polyolefins, estolides, bio-based lubricants from soybean oil, and trends in construction equipment lubrication. Features include: Contains an index of terms, acronyms, and analytical testing methods. Presents the latest conventions for describing upgraded mineral oil base fluids. Considers all the major lubrication areas: engine oils, industrial lubricants, food-grade applications, greases, and space-age applications Includes individual chapters on lubricant applications—such as environmentally friendly, disk drive, and magnetizable fluids—for major market areas around the globe. In a single, unique volume, Synthetics, Mineral Oils, and Bio-Based Lubricants: Chemistry and Technology, Third Edition offers property and performance information of fluids, theoretical and practical background to their current applications, and strong indicators for global market trends that will influence the industry for years to come.

Modeling the Performance of the Piston Ring-pack with Consideration of Non-axisymmetric Characteristics of the Power Cylinder System in Internal Combustion Engines

2005
Download Modeling the Performance of the Piston Ring-pack with Consideration of Non-axisymmetric Characteristics of the Power Cylinder System in Internal Combustion Engines PDF Online Free

Author :
Release : 2005
Genre :
Kind : eBook
Book Rating : /5 ( reviews)

GET EBOOK


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.

You may also like...