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Analyse Quantitative Dun Plasma Dair Subsonique Simulant La Rentree Atmospherique Terrestre
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Book Synopsis Analyse quantitative d'un plasma d'air subsonique simulant la rentrée atmosphérique terrestre by : Damien Studer
Download or read book Analyse quantitative d'un plasma d'air subsonique simulant la rentrée atmosphérique terrestre written by Damien Studer and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Au cours de ce travail de thèse, un jet de plasma d’air subsonique crée par une torche ICP en configuration de jet libre et de couche limite de plaque plane a été étudié au moyen de diagnostics optiques. Les espèces moléculaires majoritaires ont été sondées sur leurs états fondamentaux via les méthodes de diffusion Raman spontanée - pour N2 et O2 - et de fluorescence induite par laser large-bande à 248 nm - pour NO. En outre, l’état excité (A2 ∑+) de cette dernière molécule a fait l’objet de mesures par spectroscopie d’émission. La détermination des températures de vibration et de rotation ainsi que de la densité a été effectuée par comparaison des spectres expérimentaux avec des spectres théoriques élaborés durant cette thèse. Toutes ces techniques ont clairement mis en évidence un déséquilibre entre les températures de vibration et de rotation dans le jet libre et dans la couche limite de plaque plane. Cependant, les diagnostics laser fournissent une température cinétique – identifiée à la température de rotation - bien inférieure aux valeurs usuelles trouvées par spectroscopie d’émission. D’autre part, au centre du jet, les densités des états fondamentaux sont très proches de l’équilibre chimique à la température cinétique de l’écoulement. Par contre, la densité des états excités est très supérieure - de plusieurs ordres de grandeurs. Il apparaît ainsi qu’un code d’écoulement ne permet pas d’estimer le rayonnement d’un plasma d’air hors-équilibre. En ce qui concerne la plaque plane, on observe que l’équilibre se conserve sur N2. Au contraire, la densité de NO augmente très nettement en proche paroi. Ce phénomène peut s’expliquer directement par la catalycité sur la paroi ou par les mécanismes d’échange dans l’air en proche paroi en supposant que de l’oxygène moléculaire est produit par catalyse hétérogène.
Book Synopsis Modélisation et simulation numérique de l'écoulement d'un plasma atmosphérique pour l'étude de l'activité électrique des plasmas sur avion by : Jérôme Métral
Download or read book Modélisation et simulation numérique de l'écoulement d'un plasma atmosphérique pour l'étude de l'activité électrique des plasmas sur avion written by Jérôme Métral and published by . This book was released on 2002 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Un gaz ionisé (ou plasma) présente la propriété d'absorber ou de réfléchir les ondes électromagnétiques radar, si son taux d'ionisation est suffisant. Cette propriété suscite un intérêt particulier pour des applications dans le domaine de l'aéronautique. L'objectif de cette thèse est de pouvoir prédire les caractéristiques (électriques et énergétique) d'un plasma d'air faiblement ionisé dans un écoulement à pression atmosphérique. La description du plasma repose sur un modèle à deux températures, inspiré des modèles hors- équilibre thermique. L'écoulement du plasma est alors décrit par un système d'équations de l'hydrodynamique à deux températures couplé à un modèle collisionnel (description des échanges énergétiques) et à la cinétique chimique (réactions chimiques). Nous avons mis en œuvre un algorithme pour simuler le plasma en écoulement axisymétrique. Il s'agit d'un schéma numérique bidimensionnel de type Lagrange + Projection dont la phase de projection est un schéma d'ordre 2, adapté au transport multi- espèces. Cet algorithme nous permet de simuler des expérimentations sur l'écoulement d'un plasma atmosphérique pour valider les paramètres du modèle. Dans une deuxième partie, nous étudions la méthode des couches absorbantes parfaitement adaptées (PML) qui constitue une condition de bord pour la simulation en milieu ouvert. Son efficacité étant reconnue pour les problèmes de propagation d'onde électromagnétique, nous nous penchons sur un moyen d'adapter cette méthode de l'aéroacoustique (équations d'Euler linéarisées). Pour cela nous présentons deux approches : une méthode simple visant à éviter les oscillations numériques, et une approche plus générale où nous définissons une nouvelle formulation de couches absorbantes qui mène à des problèmes bien posés.
Book Synopsis Mise au point d'un ensemble expérimental d'analyse de jets de plasma d’arc raréfiés by : Pascal Lasgorceix
Download or read book Mise au point d'un ensemble expérimental d'analyse de jets de plasma d’arc raréfiés written by Pascal Lasgorceix and published by . This book was released on 1989 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le travail présenté dans ce mémoire s'inscrit dans un programme d'étude consacré à la réalisation de jets de plasma à basse pression et haute température, à la mise au point de moyens de diagnostiques et à l'analyse des propriétés physico-chimiques des jets. Ces jets permettent la simulation de certains paramètres liés à l'entrée d'engins spatiaux dans l'atmosphère terrestre ou de réaliser des conditions chimiques particulières. La soufflerie SR1 a été équipée d'un nouvel ensemble de capteurs reliés à un dispositif informatique permettant l'acquisition en temps réel, le traitement et la surveillance des paramètres caractérisant le fonctionnement du caisson d'expérience et des générateurs de plasma. L'expérience acquise au cours de ces dix dernières années sur la conception et la mise au point de générateurs de plasma a permis d'améliorer les performances d'un générateur à stabilisation par vortex. Les jets de plasma obtenus, sont essentiellement analysées par des sondes électrostatiques, par un spectromètre de masse et par une sonde de pression statique. L'ensemble de ces études expérimentale et théoriques, dans une première approche, a permis de mieux comprendre les propriétés des jets de plasma d'azote obtenus par des générateurs à arc et, en particulier, de mettre en évidence l'existence d'un important déséquilibre chimique. Cet ensemble expérimental sera prochainement utilisé pour étudier les propriétés des plasmas d'air et d'hydrogène et sera doté d'un dispositif de spectroscopie optique ainsi que d'une mesure locale des vitesses d'écoulement.
Book Synopsis Flows and Chemical Reactions in Heterogeneous Mixtures by : Roger Prud'homme
Download or read book Flows and Chemical Reactions in Heterogeneous Mixtures written by Roger Prud'homme and published by John Wiley & Sons. This book was released on 2014-12-03 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book - a sequel of previous publications 'Flows and Chemical Reactions' and 'Chemical Reactions in Flows and Homogeneous Mixtures' - is devoted to flows with chemical reactions in heterogeneous environments. Heterogeneous media in this volume include interfaces and lines. They may be the site of radiation. Each type of flow is the subject of a chapter in this volume. We consider first, in Chapter 1, the question of the generation of environments biphasic individuals: dusty gas, mist, bubble flow. Chapter 2 is devoted to the study at the mesoscopic scale: particle-fluid exchange of momentum and heat with determination of the respective exchange coefficients. In Chapter 3, we establish simplified equations of macroscopic balance for mass, for the momentum and energy, in the case of particles of one size (monodisperse suspension). Radiative phenomena are presented in Chapter 5.
Download or read book Satellite Situation Report written by and published by . This book was released on 1978-12 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Multiscale and Multiresolution Approaches in Turbulence by : Pierre Sagaut
Download or read book Multiscale and Multiresolution Approaches in Turbulence written by Pierre Sagaut and published by World Scientific. This book was released on 2013 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book aims to provide the reader with an updated general presentation of multiscale/multiresolution approaches in turbulent flow simulations. All modern approaches (LES, hybrid RANS/LES, DES, SAS) are discussed and recast in a global comprehensive framework. Both theoretical features and practical implementation details are addressed. Some full scale applications are described, to provide the reader with relevant guidelines to facilitate a future use of these methods.
Download or read book Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.
Book Synopsis Current International Treaties by : Thomas Bruce Millar
Download or read book Current International Treaties written by Thomas Bruce Millar and published by Taylor & Francis. This book was released on 1984-01 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Soot Formation in Combustion by : Henning Bockhorn
Download or read book Soot Formation in Combustion written by Henning Bockhorn and published by Springer Science & Business Media. This book was released on 2013-03-08 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soot Formation in Combustion represents an up-to-date overview. The contributions trace back to the 1991 Heidelberg symposium entitled "Mechanism and Models of Soot Formation" and have all been reedited by Prof. Bockhorn in close contact with the original authors. The book gives an easy introduction to the field for newcomers, and provides detailed treatments for the specialists. The following list of contents illustrates the topics under review:
Book Synopsis Direct Numerical Simulations of Gas–Liquid Multiphase Flows by : Grétar Tryggvason
Download or read book Direct Numerical Simulations of Gas–Liquid Multiphase Flows written by Grétar Tryggvason and published by Cambridge University Press. This book was released on 2011-03-10 with total page 337 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accurately predicting the behaviour of multiphase flows is a problem of immense industrial and scientific interest. Modern computers can now study the dynamics in great detail and these simulations yield unprecedented insight. This book provides a comprehensive introduction to direct numerical simulations of multiphase flows for researchers and graduate students. After a brief overview of the context and history the authors review the governing equations. A particular emphasis is placed on the 'one-fluid' formulation where a single set of equations is used to describe the entire flow field and interface terms are included as singularity distributions. Several applications are discussed, showing how direct numerical simulations have helped researchers advance both our understanding and our ability to make predictions. The final chapter gives an overview of recent studies of flows with relatively complex physics, such as mass transfer and chemical reactions, solidification and boiling, and includes extensive references to current work.
Book Synopsis Combustion Theory by : Forman A. Williams
Download or read book Combustion Theory written by Forman A. Williams and published by CRC Press. This book was released on 2018-03-05 with total page 549 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion Theory delves deeper into the science of combustion than most other texts and gives insight into combustions from a molecular and a continuum point of view. The book presents derivations of the basic equations of combustion theory and contains appendices on the background of subjects of thermodynamics, chemical kinetics, fluid dynamics, and transport processes. Diffusion flames, reactions in flows with negligible transport and the theory of pre-mixed flames are treated, as are detonation phenomena, the combustion of solid propellents, and ignition, extinction, and flamibility pehnomena.
Book Synopsis Dynamics Of Multiphase Media by : Robert Iskanderovich Nigmatulin
Download or read book Dynamics Of Multiphase Media written by Robert Iskanderovich Nigmatulin and published by CRC Press. This book was released on 1990-09-01 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 2 of a monograph on current knowledge of phenomena and the theory and analysis of multiphase systems, offering a systematic treatment of energy, mass and momentum exchange in multiphase systems along with other applications which include shock hardening of metals and boiling heat transfer.
Author :Genevieve Comte-Bellot Publisher :Springer Science & Business Media ISBN 13 :3642830455 Total Pages :597 pages Book Rating :4.6/5 (428 download)
Book Synopsis Advances in Turbulence by : Genevieve Comte-Bellot
Download or read book Advances in Turbulence written by Genevieve Comte-Bellot and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 597 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1964 the main function of the European Mechanics Committee has been to arrange Euromech Colloquia. These are three- or four-day meetings for the discussion of current research on a specified and relatively narrow topic in mechanics, by about 50 specialists chosen for their active involvement in research in that topic. The organization of each Euromech Colloquium is entrusted by the Committee to one or two selected scientists of repute in the field, and these organizers are enjoined to achieve a friendly and informal forum for discussion, with a minimum of paper work and expenditure. Over 220 Euromech Colloquia have been held since 1964 (about 40 each in France, West Germany and Britain and the remainder in 18 countries in both western and eastern Europe) on a wide range of topics drawn from the mechanics of solid materials, hydrodynamics, gas dynamics and mechanical systems. The Committee believes that collectively, Euromech Colloquia have made a significant contribution to the exchange of ideas on topics in mechanics within Europe and have thereby helped to overcome the barriers to easy scientific communication in that sorely divided continent. A few years ago the European Mechanics Committee turned its atten tion to the possible need for European conferences on a larger scale than Euromech Colloquia.
Book Synopsis Mechanical and Thermodynamical Modeling of Fluid Interfaces by : Rene Gatignol
Download or read book Mechanical and Thermodynamical Modeling of Fluid Interfaces written by Rene Gatignol and published by World Scientific. This book was released on 2001 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes a comprehensive survey of the balance equations for mass, momentum and energy for the interfaces in pure fluids and mixtures. Constitutive laws are presented for many situations in engineering science, and examples are provided, including surface viscosity effects, variable surface tension and vapor recoil. In addition, some extensions of existing theory are given: stretch effect in premixed flames, relaxation zones downstream two-phase shock waves, and effective surface tension for high gradient zones.
Book Synopsis Flows of Reactive Fluids by : Roger Prud'homme
Download or read book Flows of Reactive Fluids written by Roger Prud'homme and published by Springer Science & Business Media. This book was released on 2010-07-15 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt: The modeling of reactive flows has progressed mainly with advances in aerospace, which gave birth to a new science called aerothermochemistry, as well as through developments in chemical and process engineering. This work examines basic concepts and methods necessary to study reactive flows and transfer phenomena in areas such as fluid mechanics, thermodynamics, and chemistry. The book presents tools of interest to graduate students, researchers in mathematical physics, and engineers who wish to investigate problems of reactive flows. Portions of the text may be used in courses on the physics of liquids or in seminars on mechanics.
Book Synopsis Mean Value and Correlation Problems connected with the Motion of Small Particles suspended in a turbulent fluid by : Tchen Chan-Mou
Download or read book Mean Value and Correlation Problems connected with the Motion of Small Particles suspended in a turbulent fluid written by Tchen Chan-Mou and published by Springer. This book was released on 2013-11-21 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Large Eddy Simulation for Incompressible Flows by : P. Sagaut
Download or read book Large Eddy Simulation for Incompressible Flows written by P. Sagaut and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 437 pages. Available in PDF, EPUB and Kindle. Book excerpt: First concise textbook on Large-Eddy Simulation, a very important method in scientific computing and engineering From the foreword to the third edition written by Charles Meneveau: "... this meticulously assembled and significantly enlarged description of the many aspects of LES will be a most welcome addition to the bookshelves of scientists and engineers in fluid mechanics, LES practitioners, and students of turbulence in general."
