Download or read book Conception optimale du trac hydraulique des turbines Francis written by Ahmed Alnaga and published by . This book was released on 2006 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Devant le nombre de degré de liberté disponible dans le choix d'une nouvelle conception d'une turbomachine ou dans l'amélioration d'une machine existante. Il est aujourd'hui nécessaire de développer des techniques de conception et d'optimisation à base d'outils mathématiques permettant l'intégration efficace des méthodes et outils développées dans le dimensionnement et l'analyse des écoulements internes. Ces techniques permettent alors la recherche des meilleurs compromis conduisant à une conception optimisée. Mon travail recherche m'a permis de mettre au point une technique de tracé et d'optimisation de la géométrie des turbines FRANCIS.Cette technique est basée sur une paramétrisation géométrique de tous les éléments de la turbine (bâche avant-distributeur, directrices, roue et aspirateur). L'écoulement est ensuite estimé avec des logiciels de CFD et une fonction objectif définie à partir des performances recherchée pour la machine est évaluée à partir de l'écoulement calculé. Cette fonction objectif est donc une fonction non linéaire des paramètres qui ont servis à paramétriser la géométrie. Son optimisation est alors possible en utilisant, par exemple des algorithmes génétiques. Pour mettre en œuvre une telle optimisation, il est nécessaire d'automatiser l'ensemble du processus grâce à des scripts informatiques, pour construire la géométrie de la turbine à partir des paramètres, puis un maillage robuste des domaines de calcul.Le calcul CFD, avec le post-processing qui permet d'estimer la fonction objectif, sont ensuite exécutés automatiquement pour compléter un cycle de calcul. J'ai mis au point une telle technique d'optimisation pour toute la partie "haute pression" de la turbine. Pour la roue, une technique "manuelle" d'optimisation, beaucoup plus rapide que l'automatique, a été utilisée (5 à 10 itérations à comparer avec 150 à 200 calculs pour la méthode automatique).

Download or read book CONTRIBUTION A LA CONCEPTION DES PETITES TURBINES HYDRAULIQUES written by Tarik Belhaj and published by . This book was released on 1989 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJET DE CE PROGRAMME DE TRAVAIL EST DE CREER UN CERTAIN NOMBRE D'OUTILS INFORMATIQUES, SUR MICRO-ORDINATEURS, SUSCEPTIBLES D'AIDER LES CONSTRUCTEURS DE PETITES TURBINES HYDRAULIQUES. APRES CONSULTATION DE LA PRESQUE TOTALITE DES FABRICANTS FRANCAIS DE PETITES TURBINES, DEUX THEMES DE RECHERCHE ET DEVELOPPEMENT ONT ETE RETENUS. LE PREMIER AXE DE DEVELOPPEMENT EST LA CREATION D'UN OUTIL PERMETTANT L'ETABLISSEMENT RAPIDE ET AUTOMATIQUE D'UN AVANT-PROJET D'UNE PETITE CENTRALE HYDROELECTRIQUE. CET OUTIL DEVRAIT PERMETTRE DE RECHERCHER LA MEILLEURE ADAPTATION DES GROUPES HYDROELECTRIQUES A UN SITE A EQUIPER, DE FOURNIR LES COTES PRINCIPALES DES MACHINES ET DE LA CENTRALE, ET DANS SA PHASE FINALE, D'EDITER UN DOCUMENT PRESENTANT L'IMPLANTATION DE L'AVANT-PROJET SUR LE SITE. L'ETUDE CONSISTE A BATIR UNE STRUCTURE INFORMATIUQE SUR UN CERTAIN NOMBRE DE SCHEMAS TYPES, CHAQUE FABRICANT DEVANT LA PERSONNALISER SUIVANT SES FICHIERS HYDRAULIQUES ET DE FABRICATION, ET SES PLANS D'AVANT-PROJET. LE DEUXIEME AXE DE DEVELOPPEMENT CONSISTE A DEFINIR UNE CONCEPTION INFORMATISEE DE LA MACHINE SUR UNE STRUCTURE GLOBALE ET SIMPLIFIEE, CHAQUE CONSTRUCTEUR DEVANT INTRODUIRE A L'INTERIEUR DE CETTE MAQUETTE LES METHODES QUI LUI SONT PROPRES, ISSUES DE SON EXPERIENCE ET DE SON SAVOIR-FAIRE. LA FAISABILITE DE CETTE DEMARCHE SERA ETUDIEE POUR LES TURBINES FRANCIS

Download or read book Les origines des turbines Francis et Pelton written by Louis C. Hunter and published by . This book was released on 1964 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ETUDE DU COMPORTEMENT DYNAMIQUE DES ROUES DE TURBINES ET POMPES HYDRAULIQUES POUR LA CONCEPTION MECANIQUE OPTIMISEE written by MANOEL JOSE.. DOS SANTOS SENA and published by . This book was released on 1999 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE TRAVAIL DE THESE A POUR OBJECTIF LE DEVELOPPEMENT D'UNE METHODOLOGIE ADAPTEE A L'OPTIMISATION DU COMPORTEMENT DYNAMIQUE DE ROUES DE POMPES ET DE TURBINES HYDRAULIQUES EN CE QUI CONCERNE LES FREQUENCES PROPRES ET LES CONTRAINTES MECANIQUES DUES AUX FORCES CENTRIFUGES ET A UN CHAMP DE PRESSION MOYEN, TENANT COMPTE DE L'EFFET DE MASSE AJOUTEE DU A LA PRESENCE DE L'EAU. LES PROCEDURES D'OPTIMISATION ONT ETE ECRITES POUR LE CODE D'ELEMENTS FINIS ANSYS, PERMETTANT L'IMPLEMENTATION DE CES CALCULS DANS LE PROCESSUS GENERAL DE CONCEPTION D'UNE TURBINE OU D'UNE POMPE. LA PROPRIETE DE SYMETRIE CYCLIQUE DES GEOMETRIES DE TURBINE A ETE CONSIDEREE DANS L'INTENTION DE DIMINUER LE NOMBRE DE DEGRES DE LIBERTE ACTIFS DU PROBLEME. L'INFLUENCE DES EFFORTS CENTRIFUGES SUR LES ENERGIES CINETIQUES ET POTENTIELLES DE L'ENSEMBLE A ETE PRISE EN COMPTE PAR DES MATRICES DE RIGIDITE SUPPLEMENTAIRES. L'APPROCHE UTILISE POUR MODELISER L'INTERACTION FLUIDE - STRUCTURE A ETE DU TYPE EULERIEN. LES PROCEDURES ONT ETE D'ABORD TESTEES SUR DES CAS DE REFERENCE ET L'APPLICATION FINALE A ETE REALISEE SUR UNE ROUE DE TURBINE DU TYPE FRANCIS. UNE ETUDE DE LA SENSIBILITE DU COMPORTEMENT DYNAMIQUE DE CETTE ROUE AUX CHANGEMENTS DES CARACTERISTIQUES GEOMETRIQUES (LES EPAISSEURS DE LA CEINTURE ET DU MOYEU) A ETE REALISEE DANS L'INTENTION DE DEMONTRER LE GUIDAGE D'UN PROCESSUS D'OPTIMISATION.

Download or read book Preliminary numerical simulations of a medium head Francis turbine at speed no load written by Pierre-Luc Gagnon (Auteur de Preliminary numerical simulations of a medium head Francis turbine at speed no-load) and published by . This book was released on 2021 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Ce projet de maîtrise vise à faire une caractérisation préliminaire de l'écoulement d'une turbine Francis de moyenne chute au régime sans charge dans le cadre du projet Tr-Francis au Laboratoire de machines hydrauliques. Concrètement, le projet a validé la méthodologie numérique utilisée à l'aide de mesures expérimentales préliminaires. De plus, les simulations numérique sont permis de fournir les chargements fluides afin que des simulations structurelles puissent être réalisées. Finalement, les résultats ont permis de cibler les structures dominantes dans l'écoulement qui causent les plus importantes fluctuations de pression et ainsi aider l'équipe expérimentale à positionner les capteurs de pression et à choisir leurs plans de mesures. Pour y arriver, la méthodologie est basée sur des interpolations de mesures effectuées par Hydro-Québec au régime sans charge sur le prototype. Les données sont prises telles quelles pour les simulations effectuées à l'échelle prototype et elles sont mise à l'échelle grâce aux lois de similitude de la norme IEC 60193 pour les simulations à l'échelle modèle. L'effet des conditions d'entrée dans le domaine est étudié sur des domaines partiels avec des maillages de différentes densités ainsi que sur le domaine complet. Les pressions obtenues numériquement dans l'aspirateur sont comparées aux mesures expérimentales préliminaires et les résultats sont concordants. De plus, les poches de cavitations observées numériquement au bord de fuite remontant sur le côté pression des aubes sont, de plus, confirmées par l'expérimentation. Des analyses fréquentielles à partir des signaux de pression sont utilisées dans ce projet afin de caractériser les phénomènes. En plus d'utiliser différentes méthodes de visualisation numériques afin d'isoler et d'analyser les structures principales dans l'écoulement. Imposer un profil de vitesse uniforme comparativement à un profil de vitesse tiré de simulations de la bâche et de la conduite d'amenée ne modifie pas les résultats significativement à l'échelle modèle avec le maillage le plus fin. Lors des simulations avec le domaine complet, plusieurs phénomènes d'importances ont été observés. Notamment des tourbillons inter-aubes, qui ont une modulation à f/n = 1, une importante zone de recirculation dans l'aspirateur qui remonte jusque dans la roue, des tourbillons à l'interface entre la roue et l'aspirateur qui se développent dans la couche cisaillée, un débalancement de l'aspirateur causé par le coude ainsi qu'une zone cavitante au bord de fuite.

Download or read book Les origines des turbines Francis et Pelton d veloppement de la turbine hydraulique aux tat Unis de 1820 1900 written by Louis C. Hunter and published by . This book was released on 1962 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ANALYSE THEORIQUE ET EXPERIMENTALE DES NOUVELLES TECHNIQUES DE REGULATION DES TURBINES HYDRAULIQUES APPLICATIONS A DES TURBINES FRANCIS written by Mugur Florin Tolea and published by . This book was released on 1998 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: LES MODELES UTILISES ACTUELLEMENT POUR LA REGULATION DES TURBINES HYDRAULIQUES SONT SOUVENT TRES SIMPLIFIES ET NE PERMETTENT DE PREVOIR AVEC PRECISION SUFFISANTE LE COMPORTEMENT DES SYSTEMES DE CONTROLE - COMMANDE, LORSQUE LES CONDITIONS D'EXPLOITATION EVOLUENT ENTRE DES SITUATIONS EXTREMES. POUR PALIER A CETTE DIFFICULTE, LA CARACTERISATION EXACTE ET COHERENTE SUR LE PLAN THEORIQUE ET EXPERIMENTAL DU SYSTEME HYDROELECTRIQUE COMPLET EN S'APPUYANT SUR LES CARACTERISTIQUES HYDROMECANIQUES INTRINSEQUES REELLES DES DIFFERENTS ELEMENTS DU GROUPE, DOIT PERMETTRE DE REPRESENTER LE COMPORTEMENT STATIQUE ET DYNAMIQUE GLOBAL DANS CES CONDITIONS DE FONCTIONNEMENT FORTEMENT NON-LINEAIRE. L'OBJECTIF DE LA THESE A ETE DE METTRE AU POINT UN TEL MODELE POUR LES TURBINES FRANCIS ET DE PROPOSER DES ALGORITHMES EVOLUES D'OPTIMISATION DE LA LOI DE COMMANDE DES SYSTEMES DE REGULATION EN VITESSE. LA DEMARCHE SUIVIE PAR M. MUGUR TOLEA A CONSISTE A DEVELOPPER UN MODELE PARAMETRIQUE DES PERTES INTERNES DANS LA TURBINE. L'IDENTIFICATION DES PARAMETRES DU MODELE EST REALISEE A PARTIR DES DONNEES EXPERIMENTALES (COLLINE DE RENDEMENT). DE NOUVELLES TECHNIQUES DE REGULATION A VITESSE FIXE OU VARIABLE ONT EN SUITE ETE MISE EN UVRE. ELLES SONT BASEES SUR DES OUTILS SPECIFIQUES A LA COMMANDE INTELLIGENTE COMBINANT LES RESEAUX NEURONAUX ET LA LOGIQUE FLOUE. CETTE NOUVELLE APPROCHE A ETE TESTEE ET VALIDEE SUR UNE BOUCLE EXPERIMENTALE DE LA LABORATOIRE AVEC UNE TURBINE DE 5 KW. LA TRANSPOSITION A UNE CONFIGURATION REELLE DE CENTRALE HYDROELECTRIQUE DE 86 MW A ETE REALISEE EN LIAISON AVEC LA SOCIETE HYDRO VEVEY. LES RESULTATS SONT TRES POSITIFS ET LA TRANSPOSITION DE CETTE APPROCHE A D'AUTRES TYPES DE TURBINES HYDRAULIQUES EST ENVISAGEE.

Download or read book The Dynamics of Science and Technology written by W. Krohn and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 295 pages. Available in PDF, EPUB and Kindle. Book excerpt: The interrelations of science and technology as an object of study seem to have drawn the attention of a number of disciplines: the history of both science and technology, sociology, economics and economic history, and even the philosophy of science. The question that comes to mind is whether the phenomenon itself is new or if advances in the disciplines involved account for this novel interest, or, in fact, if both are intercon nected. When the editors set out to plan this volume, their more or less explicit conviction was that the relationship of science and technology did reveal a new configuration and that the disciplines concerned with 1tS analysis failed at least in part to deal with the change because of conceptual and methodological preconceptions. To say this does not imply a verdict on the insufficiency of one and the superiority of any other one disciplinary approach. Rather, the situation is much more complex. In economics, for example, the interest in the relationship between science and technology is deeply influenced by the theoretical problem of accounting for the factors of economic growth. The primary concern is with technology and the problem is whether the market induces technological advances or whether they induce new demands that explain the subsequent diffusion of new technologies. Science is generally considered to be an exogenous factor not directly subject to market forces and, therefore, appears to be of no interest.

Download or read book Metrology in Urban Drainage and Stormwater Management written by Jean-Luc Bertrand-Krajewski and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the advancements made in applied metrology in the field of Urban Drainage and Storm water Management over the past two decades in scientific research as well as in practical applications. Given the broadness of this subject (measuring principles, uncertainty in data, data validation, data storage and communication, design, maintenance and management of monitoring networks, technical details of sensor technology), the focus is on water quantity and a sound metrological basis. The book offers common ground for academics and practitioners when setting up monitoring projects in urban drainage and storm water management. This will enable an easier exchange of results so as to allow for a faster scientific progress in the field. A second, but equally important goal, is to allow practitioners access to scientific developments and gained experience when it comes to monitoring urban drainage and storm water systems. In-depth descriptions of international case studies covering all aspects discussed in the book are presented, along with self-training exercises and codes available for readers on a companion website.

Download or read book Karst Aquifers Characterization and Engineering written by Zoran Stevanović and published by Springer. This book was released on 2015-02-25 with total page 698 pages. Available in PDF, EPUB and Kindle. Book excerpt: This practical training guidebook makes an important contribution to karst hydrogeology. It presents supporting material for academic courses worldwide that include this and similar topics. It is an excellent sourcebook for students and other attendees of the International Karst School: Characterization and Engineering of Karst Aquifers, which opened in Trebinje, Bosnia & Herzegovina in 2014 and which will be organized every year in early summer. As opposed to more theoretical works, this is a catalog of possible engineering interventions in karst and their implications. Although the majority of readers will be professionals with geology/hydrogeology backgrounds, the language is not purely technical making it accessible to a wider audience. This means that the methodology, case studies and experiences presented will also benefit water managers working in karst environments.

Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.

Download or read book Ocean Energy written by R. H. Charlier and published by Springer Science & Business Media. This book was released on 2009-02-08 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Engineers’ dreams and fossil energy replacement schemes can come true. Man has been tapping the energy of the sea to provide power for his industries for centuries. Tidal energy combined with that of waves and marine winds rank among those most successfully put the work. Large scale plants are capital intensive but smaller ones, particularly built in China, have proven profitable. Since the initiation of the St Malo project in France, similar projects have gone into active service where methods have been devised to cut down on costs, new types of turbines developed and cost competitiveness considerably improved. Tidal power has enormous potential. The book reviews recent progress in extracting power from the ocean, surveys the history of tidal power harnessing and updates a prior publication by the author.

Download or read book Renewable Energy Policy Convergence in the EU written by David Jacobs and published by Routledge. This book was released on 2016-03-23 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book examines the coordination of renewable energy policies in the European Union using an innovative theoretical approach to explain national policy making. David Jacobs asks, why are national support instruments for electricity from renewable energy sources converging, even though the harmonisation of these frameworks at the European level has failed? Which causal mechanisms lead to cross-national policy similarities? And what are the implications for policy coordination in the EU? The author traces the evolution of feed-in tariffs - the most successful and most widely used support mechanism for renewable electricity - in Germany, Spain and France. He reveals increasing cross-national policy similarities in feed-in tariff design - despite the failure of harmonizing instruments at the European level. He explains these increasing policy similarities by applying policy convergence theory. Policy convergence can occur voluntarily, based on transnational communication, regulatory competition and technological innovations and these findings have important implications for European policy steering. The key to this book is the interrelation of an innovative theoretical concept (coordination of policies in the international arena via voluntary cooperation) with a very topical empirical research focus - the promotion of renewable energies in the EU. It will be essential reading for scholars and students of environmental policy, comparative politics and European studies.

Download or read book Hydraulic Engineering of Dams written by Willi H. Hager and published by CRC Press. This book was released on 2020-11-05 with total page 1081 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydraulic engineering of dams and their appurtenant structures counts among the essential tasks to successfully design safe water-retaining reservoirs for hydroelectric power generation, flood retention, and irrigation and water supply demands. In view of climate change, especially dams and reservoirs, among other water infrastructure, will and have to play an even more important role than in the past as part of necessary mitigation and adaptation measures to satisfy vital needs in water supply, renewable energy and food worldwide as expressed in the Sustainable Development Goals of the United Nations. This book deals with the major hydraulic aspects of dam engineering considering recent developments in research and construction, namely overflow, conveyance and dissipations structures of spillways, river diversion facilities during construction, bottom and low-level outlets as well as intake structures. Furthermore, the book covers reservoir sedimentation, impulse waves and dambreak waves, which are relevant topics in view of sustainable and safe operation of reservoirs. The book is richly illustrated with photographs, highlighting the various appurtenant structures of dams addressed in the book chapters, as well as figures and diagrams showing important relations among the governing parameters of a certain phenomenon. An extensive literature review along with an updated bibliography complete this book.

Download or read book Distinguished Figures in Mechanism and Machine Science written by Marco Ceccarelli and published by Springer. This book was released on 2014-05-21 with total page 347 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is composed of chapters that focus specifically on technological developments by distinguished figures in the history of MMS (Mechanism and Machine Science). Biographies of well-known scientists are also included to describe their efforts and experiences and surveys of their work and achievements and a modern interpretation of their legacy are presented. After the first two volumes, the papers in this third volume again cover a wide range within the field of the History of Mechanical Engineering with specific focus on MMS and will be of interest and motivation to the work (historical or not) of many.

Download or read book The Rock Manual written by Construction Industry Research and Information Association and published by . This book was released on 2007 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication is a summary of good practice on the use of rock in engineering works for rivers, coasts and seas. It has incorporated all the significant advances in knowledge that have occured over the past 10-15 years.

Download or read book Advances in Hydroinformatics written by Philippe Gourbesville and published by Springer. This book was released on 2015-08-21 with total page 616 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of extended papers based on presentations given during the SIMHYDRO 2014 conference, held in Sophia Antipolis in June 2014. It focuses on the modeling and simulation of fast hydraulic transients, on 3D modeling, and on uncertainties and multiphase flows. The book explores both the limitations and performance of current models and presents the latest developments based on new numerical schemes, high-performance computing, multiphysics and multiscale methods, and better interaction with field or scale model data. It addresses the interests of practitioners, stakeholders, researchers and engineers active in this field.