La Recherche Aérospatiale
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Published: 1995
Total Pages: 484
ISBN-13:
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Author:
Publisher:
Published: 1995
Total Pages: 484
ISBN-13:
DOWNLOAD EBOOKAuthor: Fouzi Tabet
Publisher:
Published: 2007
Total Pages: 197
ISBN-13:
DOWNLOAD EBOOKIl a été démontré que l’ajout d’une certaine proportion d’hydrogène aux hydrocarbures permet d’améliorer les performances de la combustion (amélioration de la stabilité, réduction de la pollution, etc.). Il est important de bien identifier les caractéristiques de combustion de ces combustibles composés dans différentes conditions opératoires afin de pouvoir les utiliser efficacement dans les systèmes pratiques de production d’énergie. L’approche expérimentale demeure limitée à certaines conditions opératoires du fait des coûts que peut engendrer sa mise œuvre. En revanche, la simulation numérique peut constituer une solution plus appropriée compte tenu des avancées réalisées en matière de puissance de calcul et de modélisation. Cependant, il est nécessaire, au préalable, de s’assurer du bon comportement de l’outil numérique dans plusieurs cas tests. Dans ce contexte, l’effet de l’ajout de H2 sur la structure de la flamme et la formation des polluants est étudié dans ce travail. La relation reliant la longueur de la flamme, la perte de chaleur radiative, les émissions de CO2, de CO, de NO et de suie au pourcentage d’hydrogène dans le mélange combustible est caractérisée. Les validations ont porté sur plusieurs configurations de jets turbulents à masse volumique variable et de flammes de diffusion turbulente caractérisées par différents rapports de densité et de vitesses à l’injection. Les résultats de l’addition de H2 ont permis de noter une augmentation de l’efficacité du mélange, une élévation de la température maximale, une diminution des fractions massiques de CO et de CO2, une augmentation de la production de NO et une réduction des quantités de suies émises.
Author: Alain Dervieux
Publisher: Springer
Published: 2014-03-12
Total Pages: 483
ISBN-13: 9783662137482
DOWNLOAD EBOOKInterest in numerical combustion is growing among applied mathematicians, physicists, chemists, engine manufacturers and many industrialists. This proceedings volume contains nine invited lectures and twenty seven contributions carefully selected by the editors. The major themes are numerical simulation of transsonic and supersonic combustion phenomena, the study of supersonic reacting mixing layers, and turbulent combustion. Emphasis is laid on hyperbolic models and on numerical simulations of hydrocarbon planes with a complete set of chemical reactions carried out in two-dimensional geometries as well as on complex reactive flow simulations.
Author: Heinz Pitsch
Publisher: Springer Nature
Published: 2020-05-28
Total Pages: 294
ISBN-13: 3030447189
DOWNLOAD EBOOKThis book presents methodologies for analysing large data sets produced by the direct numerical simulation (DNS) of turbulence and combustion. It describes the development of models that can be used to analyse large eddy simulations, and highlights both the most common techniques and newly emerging ones. The chapters, written by internationally respected experts, invite readers to consider DNS of turbulence and combustion from a formal, data-driven standpoint, rather than one led by experience and intuition. This perspective allows readers to recognise the shortcomings of existing models, with the ultimate goal of quantifying and reducing model-based uncertainty. In addition, recent advances in machine learning and statistical inferences offer new insights on the interpretation of DNS data. The book will especially benefit graduate-level students and researchers in mechanical and aerospace engineering, e.g. those with an interest in general fluid mechanics, applied mathematics, and the environmental and atmospheric sciences.
Author: D Brian Spalding
Publisher: Elsevier
Published: 2014-05-18
Total Pages: 393
ISBN-13: 1483188175
DOWNLOAD EBOOKGenmix: A General Computer Program for Two-dimensional Parabolic Phenomena explains a computer program called GENMIX. The main intention of the program is to be used as a tool of instructions. The name of the program is a mixture of two considerations: its generality and its concern for mixing processes. The book aims to help the potential user to understand the physical and mathematical basis of the topic computer program. It is also the aim of the book to make the program applicable to practical problems. The book is arranged in such a way as to parallel a course of lectures and associated computer-workshop sessions wherein the student is allowed to do some elementary computations as soon as he has gained some knowledge of the method. The book contains the mathematical, physical, and computer-coding aspects of the program. Concepts such as the boundary layer, two-dimensional, and steady- flow are defined and discussed in depth. The text will be a useful tool for computer instructors and students.
Author: Josette Bellan
Publisher:
Published: 2020
Total Pages: 0
ISBN-13: 9781624105807
DOWNLOAD EBOOKDescribes observations and modelling of high-pressure flows encountered in aeronautics and astronautics. They have been selected to present the current understanding of high-pressure flows. Experimental, theoretical and numerical studies are all represented. Fundamental investigations are presented first, followed by practical studies.
Author: Roland Borghi
Publisher: Editions Technips
Published: 1998
Total Pages: 0
ISBN-13: 9782710807407
DOWNLOAD EBOOKProfessionals working in the field of combustion may well find many points of interest, highlighted by the book's logical and global approach to phenomena, which considers mechanical, thermal and chemical aspects simultaneously. The book prioritises an understanding of the physical and chemical aspects of the phenomena, and lays particular emphasis on experimental analyses and modern numerical simulations, and on the way in which these phenomena are translated into equations.Contents: Introduction: Discovering combustion and flames. 1. Combustion thermodynamics. 2. Chemical kinetics applied to combustion. 3. Mass and energy transport by convection and diffusion. 4. Self-ignitions in closed systems. 5. Laminar flames and deflagrations. 6. Turbulent flames and deflagrations. 7. Detonation and supersonic combustion. 8. Flame ignition. 9. Combustion of liquids and sprays. 10. Pollutant emissions in combustion reactions. Index.
Author: Suhas V. Patankar
Publisher:
Published: 1970
Total Pages: 248
ISBN-13:
DOWNLOAD EBOOKAuthor: Andreas Kempf
Publisher:
Published: 2004
Total Pages: 115
ISBN-13: 9783183513062
DOWNLOAD EBOOKAuthor: Dudley Brian Spalding
Publisher:
Published: 1963
Total Pages: 498
ISBN-13:
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