modeling engine spray and combustion processes heat and mass transfer

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Modeling Engine Spray And Combustion Processes

Author : Gunnar Stiesch
ISBN : 9783662087909
Genre : Computers
File Size : 77. 46 MB
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The utilization of mathematical models to numerically describe the performance of internal combustion engines is of great significance in the development of new and improved engines. Today, such simulation models can already be viewed as standard tools, and their importance is likely to increase further as available com puter power is expected to increase and the predictive quality of the models is constantly enhanced. This book describes and discusses the most widely used mathematical models for in-cylinder spray and combustion processes, which are the most important subprocesses affecting engine fuel consumption and pollutant emissions. The relevant thermodynamic, fluid dynamic and chemical principles are summarized, and then the application of these principles to the in-cylinder processes is ex plained. Different modeling approaches for the each subprocesses are compared and discussed with respect to the governing model assumptions and simplifica tions. Conclusions are drawn as to which model approach is appropriate for a specific type of problem in the development process of an engine. Hence, this book may serve both as a graduate level textbook for combustion engineering stu dents and as a reference for professionals employed in the field of combustion en gine modeling. The research necessary for this book was carried out during my employment as a postdoctoral scientist at the Institute of Technical Combustion (ITV) at the Uni versity of Hannover, Germany and at the Engine Research Center (ERC) at the University of Wisconsin-Madison, USA.

Experiments And Numerical Simulations Of Diluted Spray Turbulent Combustion

Author : Bart Merci
ISBN : 9400714092
Genre : Technology & Engineering
File Size : 20. 65 MB
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This book reflects the outcome of the 1st International Workshop on Turbulent Spray Combustion held in 2009 in Corsica (France). The focus is on reporting the progress of experimental and numerical techniques in two-phase flows, with emphasis on spray combustion. The motivation for studies in this area is that knowledge of the dominant phenomena and their interactions in such flow systems is essential for the development of predictive models and their use in combustor and gas turbine design. This necessitates the development of accurate experimental methods and numerical modelling techniques. The workshop aimed at providing an opportunity for experts and young researchers to present the state-of-the-art, discuss new developments or techniques and exchange ideas in the areas of experimentations, modelling and simulation of reactive multiphase flows. The first two papers reflect the contents of the invited lectures, given by experts in the field of turbulent spray combustion. The first concerns computational issues, while the second deals with experiments. These lectures initiated very interesting and interactive discussions among the researchers, further pursued in contributed poster presentations. Contributions 3 and 4 focus on some aspects of the impact of the interaction between fuel evaporation and combustion on spray combustion in the context of gas turbines, while the final article deals with the interaction between evaporation and turbulence.

Mixture Formation In Internal Combustion Engines

Author : Carsten Baumgarten
ISBN : 9783540308362
Genre : Technology & Engineering
File Size : 62. 63 MB
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A systematic control of mixture formation with modern high-pressure injection systems enables us to achieve considerable improvements of the combustion pr- ess in terms of reduced fuel consumption and engine-out raw emissions. However, because of the growing number of free parameters due to more flexible injection systems, variable valve trains, the application of different combustion concepts within different regions of the engine map, etc., the prediction of spray and m- ture formation becomes increasingly complex. For this reason, the optimization of the in-cylinder processes using 3D computational fluid dynamics (CFD) becomes increasingly important. In these CFD codes, the detailed modeling of spray and mixture formation is a prerequisite for the correct calculation of the subsequent processes like ignition, combustion and formation of emissions. Although such simulation tools can be viewed as standard tools today, the predictive quality of the sub-models is c- stantly enhanced by a more accurate and detailed modeling of the relevant pr- esses, and by the inclusion of new important mechanisms and effects that come along with the development of new injection systems and have not been cons- ered so far. In this book the most widely used mathematical models for the simulation of spray and mixture formation in 3D CFD calculations are described and discussed. In order to give the reader an introduction into the complex processes, the book starts with a description of the fundamental mechanisms and categories of fuel - jection, spray break-up, and mixture formation in internal combustion engines.

Internal Combustion Processes Of Liquid Rocket Engines

Author : Zhen-Guo Wang
ISBN : 9781118890028
Genre : Technology & Engineering
File Size : 60. 89 MB
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This book concentrates on modeling and numerical simulations of combustion in liquid rocket engines, covering liquid propellant atomization, evaporation of liquid droplets, turbulent flows, turbulent combustion, heat transfer, and combustion instability. It presents some state of the art models and numerical methodologies in this area. The book can be categorized into two parts. Part 1 describes the modeling for each subtopic of the combustion process in the liquid rocket engines. Part 2 presents detailed numerical methodology and several representative applications in simulations of rocket engine combustion.

Heat And Mass Transfer In Gasoline And Diesel Engines

Author : Dudley Brian Spalding
ISBN : UOM:39015048122058
Genre : Technology & Engineering
File Size : 24. 41 MB
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Previews Of Heat And Mass Transfer

Author :
ISBN : UVA:X006067511
Genre : Heat
File Size : 89. 40 MB
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Modeling Spray Wall Impingement Heat Transfer In Direct Injection Engines

Author : Joel E. Eckhause
ISBN : WISC:89052191095
Genre :
File Size : 80. 73 MB
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Heat And Mass Transfer Fundamentals

Author : T. Nejat Veziroğlu
ISBN : 1560720689
Genre : Heat
File Size : 74. 94 MB
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Droplets And Sprays

Author : Sergei Sazhin
ISBN : 9781447163862
Genre : Technology & Engineering
File Size : 28. 71 MB
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Providing a clear and systematic description of droplets and spray dynamic models, this book maximises reader insight into the underlying physics of the processes involved, outlines the development of new physical and mathematical models and broadens understanding of interactions between the complex physical processes which take place in sprays. Complementing approaches based on the direct application of computational fluid dynamics (CFD), Droplets and Sprays treats both theoretical and practical aspects of internal combustion engine process such as the direct injection of liquid fuel, subcritical heating and evaporation. Including case studies that illustrate the approaches relevance to automotive applications, it is also anticipated that the described models can find use in other areas such as in medicine and environmental science.


Author : Günter P. Merker
ISBN : 9783322967749
Genre : Technology & Engineering
File Size : 69. 41 MB
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Das Buch spannt einen Bogen von einfachen thermodynamischen Grundlagen des Verbrennungsmotors hin zu komplexen Modellansätzen zur Beschreibung der Gemischbildung, Zündung, Verbrennung und Schadstoffbildung unter Beachtung der Motorperipherie von Otto- und Dieselmotoren. Damit liegt der inhaltliche Schwerpunkt des Buches auf den Simulationsmodellen und deren strömungstechnischen, thermodynamischen und verbrennungschemischen Grundlagen, wie sie für die Entwicklung moderner Verbrennungsmotoren untentbehrlich sind. In der 2. Auflage werden dazu die bisherigen Bände der Reihe "Technische Verbrennung" neu bearbeitet zusammengeführt.

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