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Mesures 3d Par Cameras Ccd De Champs De Vitesse Dans Des Ecoulements Turbulents
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Book Synopsis Mesures 3D par caméras CCD de champs de vitesse dans des écoulements turbulents by : Sébastien Coudert
Download or read book Mesures 3D par caméras CCD de champs de vitesse dans des écoulements turbulents written by Sébastien Coudert and published by . This book was released on 2002 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce travail consiste aux développements et à l'amélioration de techniques expérimentales de mesures 3D de vitesses au sein d'écoulement de fluide. Ces techniques sont des systèmes de vélocimétrie par image de particule (PIV) stéréoscopique en configuration angulaire. Des méthodes et des montages sont proposés pour déterminer avec précision les erreurs de mesure, pour diminuer et corriger ces erreurs, mais aussi pour simplifier la mise en œuvre de ces techniques. Les problèmes liés aux calibrages des caméras, et aux erreurs commises en cas de désalignement du plan d'observation (plan laser) par rapport au plan de calibrage, sont analysés et résolus. 2 méthodes ont été proposées pour corriger ces erreurs, qui peuvent être importantes dans certains cas. 2 types d'objectif sont étudiés, utilisés et comparés : les objectifs standards et les objectifs télécentriques. En particulier, les auto-dimensionnements des systèmes stéréoscopiques sont réalisés, et ouvrent la voie à l'auto-étalonnage des caméras de système stéréoscopique. Notre étude a montré que les fonctions géométriques de calibrage et l'utilisation d'objectifs télécentriques permettent d'améliorer de nombreux points par rapport aux fonctions générales et l'utilisation d'objectifs standards en conditions de Scheimpflug. Premièrement, des efforts spécifiques sont réalisés sur la modélisation des fonctions géométriques, afin d'atteindre la même précision qu'avec des fonctions générales. Deuxièmement, les objectifs télécentriques permettent d'éliminer les effets de perspectives sur les images acquises, limiter le temps d'installation du système stéréoscopique ainsi que celui du temps de calcul des vecteurs vitesses 3D. Cependant, ils ont l'inconvénient d'être limités en taille de champs. 2 campagnes d'essais avec 2 systèmes stéréoscopiques différents ont permis de mesurer les vitesses 3D au sein d'écoulements de jet axisymétrique turbulent.
Book Synopsis Laser Velocimetry in Fluid Mechanics by : Alain Boutier
Download or read book Laser Velocimetry in Fluid Mechanics written by Alain Boutier and published by John Wiley & Sons. This book was released on 2012-10-22 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: In fluid mechanics, velocity measurement is fundamental in order to improve the behavior knowledge of the flow. Velocity maps help us to understand the mean flow structure and its fluctuations, in order to further validate codes. Laser velocimetry is an optical technique for velocity measurements; it is based on light scattering by tiny particles assumed to follow the flow, which allows the local fluid flow velocity and its fluctuations to be determined. It is a widely used non-intrusive technique to measure velocities in fluid flows, either locally or in a map. This book presents the various techniques of laser velocimetry, as well as their specific qualities: local measurements or in plane maps, mean or instantaneous values, 3D measurements. Flow seeding with particles is described with currently used products, as well as the appropriate aerosol generators. Post-processing of data allows us to extract synthetic information from measurements and to perform comparisons with results issued from CFD codes. The principles and characteristics of the different available techniques, all based on the scattering of light by tiny particles embedded in the flow, are described in detail; showing how they deliver different information, either locally or in a map, mean values and turbulence characteristics.
Book Synopsis DEVELOPPEMENT D'UNE METHODE DE MESURE DES CHAMPS DE VITESSE ET D'UNE CONCENTRATION DANS DES ECOULEMENTS TURBULENTS A L'AIDE D'UN LASER A DOUBLE IMPULSION ASSOCIE A UN SYSTEME D'ANALYSE NUMERIQUE D'IMAGES by : CHRISTOPHE.. COURCIER
Download or read book DEVELOPPEMENT D'UNE METHODE DE MESURE DES CHAMPS DE VITESSE ET D'UNE CONCENTRATION DANS DES ECOULEMENTS TURBULENTS A L'AIDE D'UN LASER A DOUBLE IMPULSION ASSOCIE A UN SYSTEME D'ANALYSE NUMERIQUE D'IMAGES written by CHRISTOPHE.. COURCIER and published by . This book was released on 1984 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: UNE METHODE DE VISUALISATION D'ECOULEMENTS TURBULENTS PAR PRISE DE VUE PHOTOGRAPHIQUE DE CHAMPS DE PARTICULES MICRONIQUES A ETE DEVELOPPEE. L'ILLUMINATION PAR UN LASER A DOUBLE IMPULSION FOURNISSANT 0,5 J EN DEUX FOIS 20 NANOSECONDES DANS UN PLAN LUMINEUX PERMET D'ENREGISTRER LE MOUVEMENT DES TRACEURS SOUS FORME DE BIPOINTS. DES SERIES DE CLICHES ONT ETE OBTENUES DANS UN JET TURBULENT D'AIR. LE TRAITEMENT NUMERIQUE DES IMAGES PERMET LA MESURE SIMULTANEE DES FLUCTUATIONS TURBULENTES DE VITESSE DU FLUIDE ET DE LA CONCENTRATION EN UN SCALAIRE PASSIF. ON UTILISE POUR CELA UN ALGORITHME D'AUTOCORRELATION QUI EXTRAIT LOCALEMENT L'INFORMATION RELATIVE AU MOUVEMENT DES TRACEURS ET UN PROCEDE D'ETALONNAGE INDIRECT POUR LA CONCENTRATION EN AEROSOL
Book Synopsis Développement d'une méthode de mesure des champs de vitesse et de concentration dans des écoulements turbulents à l'aide d'un laser à double impulsion associé à un système d'analyse numérique d'images by : Christophe Courcier
Download or read book Développement d'une méthode de mesure des champs de vitesse et de concentration dans des écoulements turbulents à l'aide d'un laser à double impulsion associé à un système d'analyse numérique d'images written by Christophe Courcier and published by . This book was released on 1984 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Turbulent Jets and Plumes by : Joseph Hun-wei Lee
Download or read book Turbulent Jets and Plumes written by Joseph Hun-wei Lee and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jets and plumes are shear flows produced by momentum and buoyancy forces. Examples include smokestack emissions, fires and volcano eruptions, deep sea vents, thermals, sewage discharges, thermal effluents from power stations, and ocean dumping of sludge. Knowledge of turbulent mixing by jets and plumes is important for environmental control, impact and risk assessment. Turbulent Jets and Plumes introduces the fundamental concepts and develops a Lagrangian approach to model these shear flows. This theme persists throughout the text, starting from simple cases and building towards the practically important case of a turbulent buoyant jet in a density-stratified crossflow. Basic ideas are illustrated by ample use of flow visualization using the laser-induced fluorescence technique. The text includes many illustrative worked examples, comparisons of model predictions with laboratory and field data, and classroom tested problems. An interactive PC-based virtual-reality modelling software (VISJET) is also provided. Engineering and science students, researchers and practitioners may use the book both as an introduction to the subject and as a reference in hydraulics and environmental fluid mechanics.
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 CFD Validation for Propulsion System Components (la Validation CFD Des Organes Des Propulseurs). by :
Download or read book CFD Validation for Propulsion System Components (la Validation CFD Des Organes Des Propulseurs). written by and published by . This book was released on 1998 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Sensing in Air and Water by : Horst Bleckmann
Download or read book Flow Sensing in Air and Water written by Horst Bleckmann and published by Springer Science & Business Media. This book was released on 2014-01-22 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this book, leading scientists in the fields of sensory biology, neuroscience, physics and engineering explore the basic operational principles and behavioral uses of flow sensing in animals and how they might be applied to engineering applications such as autonomous control of underwater or aerial vehicles. Although humans possess no flow-sensing abilities, countless aquatic (e.g. fish, cephalopods and seals), terrestrial (e.g. crickets and spiders) and aerial (e.g. bats) animals have flow sensing abilities that underlie remarkable behavioral feats. These include the ability to follow silent hydrodynamic trails long after the trailblazer has left the scene, to form hydrodynamic images of their environment in total darkness, and to swim or fly efficiently and effortlessly in the face of destabilizing currents and winds.
Book Synopsis Hypersonic Flow Theory by : Wallace Hayes
Download or read book Hypersonic Flow Theory written by Wallace Hayes and published by Elsevier. This book was released on 2012-12-02 with total page 481 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hypersonic Flow Theory presents the fundamentals of fluid mechanics, focusing on the hypersonic flow theory and approaches in theoretical aerodynamics. This book discusses the assumptions underlying hypersonic flow theory, unified supersonic-hypersonic similitude, two-dimensional and axisymmetric bodies, and circular cylinder. The constant-streamtube-area approximation, streamtube-continuity methods, and tangent-wedge and tangent-cone are also deliberated. This text likewise covers the similar laminar boundary layer solutions, bluntness induced interactions on slender bodies, and free molecule transfer theory. The dynamics of hypersonic flight or hypersonic wing theory, magnetohydrodynamic theory, or any developments involving treatment of the Boltzmann equation are not included. This publication is intended for hypersonic aerodynamicists, students, and researchers conducting work on the hypersonic flow phenomena.
Book Synopsis Review of Research on Laterites by : Roger Maignien
Download or read book Review of Research on Laterites written by Roger Maignien and published by . This book was released on 1966 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Background, definition and scope of the problem; Morphological and analytical characteristics of laterites; Global distribution of laterites; Origin of laterites; Classification of laterites.
Book Synopsis Physical Properties of Amorphous Materials by : David Adler
Download or read book Physical Properties of Amorphous Materials written by David Adler and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Institute for Amorphous Studies was founded in 1982 as the international center for the investigation of amorphous mate rials. It has since played an important role in promoting the und er standing of disordered matter in general. An Institute lecture series on "Fundamentals of Amorphous Materials and Devices" was held during 1982-83 with distinguished speakers from universities and industry. These events were free and open to the public ,and were attended by many representatives of the scientific community. The lectures themselves were highly successful inasmuch as they provided not only formal instruction but also an opportunity for vigorous and stimulating debate. That last element could not be captured within the pages of a book I but the lectures concentrated on the latest advances in the field I which is why their essential contents are he re reproduced in collective form. Together they constitute an interdisciplinary status report of the field. The speakers brought many different viewpoints and a variety of back ground experiences io bear on the problems involved I but though language and conventions vary I the essential unity of the concerns is very clear I as indeed are the ultimate benefits of the many-sided approach.
Download or read book Engine Airframe Integration written by and published by . This book was released on 1992 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transport Phenomena in Membranes by : N. Lakshminarayanaiah
Download or read book Transport Phenomena in Membranes written by N. Lakshminarayanaiah and published by . This book was released on 1969 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerodynamics and aeroacoustics of rotorcraft by :
Download or read book Aerodynamics and aeroacoustics of rotorcraft written by and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Secondary Flows in Turbomachines by : Von Karman Institute for Fluid Dynamics
Download or read book Secondary Flows in Turbomachines written by Von Karman Institute for Fluid Dynamics and published by . This book was released on 1975 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Steady and Transient Performance Prediction of Gas Turbine Engines by :
Download or read book Steady and Transient Performance Prediction of Gas Turbine Engines written by and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
