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Mit der Getriebefan-Technologie werden hohe Nebenstromverhältnisse und damit effizientere und leisere Flugantriebe möglich. Bei dieser Triebwerksarchitektur ist die Optimierung des Ölsystems im integralen Höchstleistungsgetriebe unerlässlich, insbesondere hinsichtlich dessen Kühlfunktion. Vorangegangene Untersuchungen haben gezeigt, dass der Ölausbreitung über die Zahnflanken infolge der Ölstrahl-Zahnrad-Interaktion (ÖZI) eine wichtige Rolle für die mittels Einspritzschmierung erzielte Kühlwirkung zukommt. Dennoch ist die Charakterisierung der ÖZI bislang lückenhaft. In dieser Arbeit wird die ÖZI mittels numerischer Strömungssimulation (CFD) zugänglich gemacht. Der dreidimensionale und transiente Strömungsprozess wird hochaufgelöst abgebildet, wodurch dessen quantitative Analyse möglich wird. Zum Einsatz kommen die gitterbasierte Volume-of-Fluid(VOF)-Methode und erstmals die partikelbasierte Smoothed-Particle-Hydrodynamics(SPH)-Methode. Unter Variation von Betriebsparametern wird die Datenbasis zur Charakterisierung der ÖZI geschaffen. Außerdem wird der Zahnradeingriff erstmals simulativ berücksichtigt. Als Haupteinflussgrößen für die Zahnflankenbenetzung werden die Aufpralltiefe, das Effektivvolumen und die Aufprall-Reynolds-Zahl identifiziert. Auf dieser Basis gebildete Korrelationen für die Benetzungsfläche und die Eindringtiefe sind durch die vorliegende Arbeit erstmals verfügbar. Dies unterstützt die Optimierung des Ölsystems für Getriebefan-Triebwerke und motiviert den weiteren Einsatz von CFD in Praxis und Forschung auf diesem Gebiet.

Vegetable oils are a group of fats derived from seeds, nuts, cereal grains, and fruits. It is important to understand that not all vegetable oils are liquid oils at ambient temperatures. Vegetable oils have enormous potential as alternatives for mineral oil in a myriad of industrial applications. Although our knowledge of the genes and biochemical pathways leading to the formation of plant oils allows for the potential to engineer a diverse array of lipid products in seed oils, this goal remains a challenge. This book identifies the prospects of vegetable oils for different applications that facilitate readers from academia, industry, and research laboratories to enhance their knowledge of utilizing vegetable oils in different industrial sectors.

Discusses all the major aspects of automotive and engine lubrication - presenting state-of-the-art advances in the field from both research and industrial perspectives. This book should be of interest to mechanical, lubrication and automotive engineers, automotive and machinery designers as well as undergraduate and graduate students in these fields.

Advances in processing methods are not only improving the quality and yield of lubricant base stocks, they are also reducing the dependence on more expensive crude oil starting materials. Process Chemistry of Lubricant Base Stocks provides a comprehensive understanding of the chemistry behind the processes involved in petroleum base stock p

KEY FEATURES: Assists scientists, engineers and researchers in the development of a new high performance lubricant·An essential review of the state of knowledge in tribochemistry.The first book published related to tribochemistry oilsDESCRIPTION:This latest title takes a new and unconventional look at engine oil as a micellar system. It is the first book of its kind to focus on the tribochemistry of oils and is thus an essential resource to practicing scientists and engineers in the petroleum industry and to all interested in the development of a superior high performance lubricant. Guaranteeing its broad appeal the book gives an invaluable review of the state of knowledge in the rapidly growing area of tribochemistry. The concept of miscelles is clearly explained along their application to stimulate the quality of engine oil, improve fuel efficiency and maintain adequate wear protection formulation. This represents a fresh approach to the formation of anti-wear tribofilms. A new look at engine design trends is given further assisting engineers in the development of a superior lubricant

Provides state-of-the-art information on all processes currently used to manufacture lubricant base oils and waxes-offering practical, timesaving solutions for specific on-the-job problems. Furnishes helpful lists of conversion factors, construction cost data, and process licensors, as well as a glossary of essential petroleum processing terms.

The Role of Engine Oil Viscosity in Low Temperature Cranking and Starting, Volume 10 presents the methods for measuring the low temperature viscosity of engine oils that would correlate with the Coordinating Research Council (CRC) engine test results. This book discusses the historical background, technical progress, and the role of engine oil viscosity in low temperature cranking and starting of engines. Organized into 18 chapters, this volume starts with an overview of the importance of oil viscosity in cold starting. This text then discusses the major effects and other factors that play a part in cold starting, including oil viscosity, oil pumpability, battery condition, fuel volatility, ignition efficiency, engine clearances, and starter motor characteristics. Other chapters consider the progress in motor oil whereby multiple viscosity graded oils are capable of meeting two of more SAE viscosity grades that introduced some technical problems. The final chapter deals with the development of a reciprocating viscometer. Automotive engineers will find this book useful.