Download or read book M thodologie et optimisation dans la conception et l analyse des performances des turbomachines fluide incompressible written by Miguel Alejandro Asuaje and published by . This book was released on 2003 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt: Confrontés au problème de tracé (design) des machines, le souci des constructeurs est de disposer de méthodes rapides, fiables et suffisamment précises. Le présent travail de recherche à caractère théorique et expérimental, s'inscrit dans cette direction. Ainsi, nous avons mis au point une démarche complète de dimensionnement et d'optimisation dans la conception et l'analyse des performances des turbomachines centrifuges et hélico-centrifuge à fluide incompressible. Partant d'un cahier de charges, la définition géométrique de la pompe ainsi que l'analyse de ses performances globales sont réalisées à partir d'une méthode dite ligne moyenne (ID) basée sur des modèles théoriques et des corrélations expérimentales. Une deuxième étape, basée sur l'étude des écoulements méridien et aube à aube (méthode dite quasi-3D), est réalisée à l'aide du logiciel REMIX développé au LEMFI. Ce code permet la résolution des équations dynamiques moyennées régissant l'écoulement interne stationnaire et non visqueux dans le repère relatif. L'étape finale de la démarche consiste en l'étude tridimensionnelle de l'écoulement à l'aide des logiciels de la CFD du groupe AEA-Technology (CFX), permettant de compléter et de valider la procédure établie. Pour illustrer cette démarche, une machine centrifuge à volute a servi de support. Dans un premier temps,l'étude de la roue existante a été réalisée pour la mise au point et la validation des différents éléments de la démarche. L'ensemble roue-volute est étudié et comparé, par la suite, aux résultats expérimentaux. Une attention spéciale est portée sur les effets instationnaires, conséquence de l'interaction roue-volute. Les résultats obtenus semblent très cohérents. Finalement, la démarche intégrale est appliquée pour l'optimisation d'une pompe hélico-centrifuge équipée d'un redresseur. S'agissant d'une pompe mal dimensionnée, l'optimisation de l'ensemble est une bonne illustration

Download or read book Incompressible Flow Turbomachines written by G.F. Round and published by Butterworth-Heinemann. This book was released on 2004-06-15 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Historical Background and Present State of Development; Theory of Turbo Machines; Turbines; Pumps; Some Aspects of Design; Blades of Single and Double Curvature; Inlet Elements & Outlet Elements; Head Losses in Components of Turbine and Pump Systems; Cavitation; Water Hammer; Corrosion; References; Appendices.

Download or read book Turbomachines fluides incompressibles written by Jacques Bernard and published by . This book was released on 2020-03-03 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 ANALYSE AUBE A AUBE DE L ECOULEMENT INSTATIONNAIRE MULTIGRILLES PAR LA METHODE DES SINGULARITES APPLICATION AUX TURBO MACHINES A FLUIDE INCOMPRESSIBLE written by THABET.. BELAMRI and published by . This book was released on 1998 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: NOUS AVONS DEVELOPPE UN CODE AUBE A AUBE POUR L'ANALYSE DE L'ECOULEMENT INSTATIONNAIRE DANS LES TURBOMACHINES A FLUIDE INCOMPRESSIBLE. CE CODE EST BASE SUR LA METHODE DES SINGULARITES A DISTRIBUTION DISCRETE DE TOURBILLONS. LES INTENSITES DE CES DERNIERES SONT DETERMINEES PAR LA CONDITION DE GLISSEMENT A LA SURFACE DU PROFIL AINSI QU'UNE CONDITION DE KUTTA AU BORD DE FUITE. LA VALIDATION DU CODE A PORTE AUSSI BIEN SUR LES PROFILS ISOLES QUE SUR LES GRILLES D'AUBES. LA COMPARAISON SINGULARITES-ANALYTIQUE OU SINGULARITES-EXPERIENCE S'EST AVEREE TRES SATISFAISANTE. CETTE PRECISION DEPENDANT A LA FOIS DE LA FORME DU PROFIL, DE LA QUALITE DE SON LISSAGE, DU NOMBRE DE TOURBILLONS DISTRIBUES ET DU MODE D'ECRITURE DE LA CONDITION DE KUTTA, A ETE RENDUE POSSIBLE PAR LA MISE EN PLACE D'UNE METHODE RIGOUREUSE DE LISSAGE DES PROFILS AINSI QUE DE LA CIRCULATION DANS LES REGIONS ANGULEUSES DU BORD DE FUITE. DURANT CE PROGRAMME DE RECHERCHE, NOUS AVONS MONTRE LA FAIBLE CONTRIBUTION DU DETACHEMENT TOURBILLONNAIRE ET NOUS NOUS SOMMES CONTENTES DU REGIME QUASI-STATIONNAIRE. DE MEME, UN MODELE SIMULANT LES PERTURBATIONS AMONT, A ETE ELABORE. CE MODELE ETANT PERIODIQUE, EST CARACTERISE PAR UNE FREQUENCE ET UNE AMPLITUDE AJUSTABLES. L'APPLICATION DU CODE EN TURBOMACHINES A CONCERNE DEUX ETUDES : - LA CARACTERISATION THEORIQUE ET EXPERIMENTALE DE L'ECOULEMENT INTERAUBE DANS UNE POMPE CENTRIFUGE. DANS CETTE ETUDE, NOUS AVONS MIS EN EVIDENCE LE PHENOMENE DE GLISSEMENT AINSI QUE LES ZONES DE RECIRCULATION, EN DEBIT PARTIEL, LIEES ESSENTIELLEMENT A LA PRESENCE DU TOURBILLON RELATIF. LA COMPARAISON THEORIE-EXPERIENCE DES PRESSIONS INTERAUBES EST GLOBALEMENT SATISFAISANTE. - LA SECONDE APPLICATION A ETE MENEE SUR LA PREDICTION DU BRUIT DES VENTILATEURS AXIAUX. PARTANT DES EFFORTS QUANTIFIES PAR NOTRE CODE, LES NIVEAUX SONORES SONT ACCESSIBLES ET COMPARABLES AVEC LES PERFORMANCES EXPERIMENTALES. LES RESULTATS EXPERIMENTAUX OBTENUS SUR TROIS VENTILATEURS PROTOTYPES, CONFIRMENT LA VALIDITE DE NOTRE DEMARCHE.

Download or read book ICREEC 2019 written by Ahmed Belasri and published by Springer Nature. This book was released on 2020-06-10 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights peer reviewed articles from the 1st International Conference on Renewable Energy and Energy Conversion, ICREEC 2019, held at Oran in Algeria. It presents recent advances, brings together researchers and professionals in the area and presents a platform to exchange ideas and establish opportunities for a sustainable future. Topics covered in this proceedings, but not limited to, are photovoltaic systems, bioenergy, laser and plasma technology, fluid and flow for energy, software for energy and impact of energy on the environment.

Download or read book Slurry Transport Using Centrifugal Pumps written by K. C. Wilson and published by Springer Science & Business Media. This book was released on 2008-03-28 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt: 1,1 Applications of Slurry Transport Vast tonnages are pumped every year in the form of solid-liquid mixtures, known as slurries. The application which involves the largest quantities is the dredging industry, continually maintaining navigation in harbours and rivers, altering coastlines and winning material for landfill and construction purposes. As a single dredge may be required to maintain a throughput of 7000 tonnes of slurry per hour or more, very large centrifugal pumps are used. Figures 1-1 and 1-2 show, respectively, an exterior view of this type of pump, and a view of a large dredge-pump impeller (Addie & Helmley, 1989). The manufacture of fertiliser is another process involving massive slur- transport operations. Li Florida, phosphate matrix is recovered by huge draglines in open-pit mining operations. It is then slurried, and pumped to the wash plants through pipelines with a typical length of about 10 kilometres. Each year some 34 million tonnes of matrix are transported in this manner. This industry employs centrifugal pumps that are generally smaller than those used in large dredges, but impeller diameters up to 1. 4 m are common, and drive capacity is often in excess of 1000 kW. The transport distance is typically longer than for dredging applications, and Chapter 1 Figure LI. Testing a dredge pump at the GIW Hydraulic Laboratory Figure 1. 2. Impeller for large dredge pump 1. Introduction 3 hence a series of pumping stations is often used. Figure 1-3 shows a boost- pump installation in a phosphate pipeline.

Download or read book Through flow Calculations in Axial Turbomachinery written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel and published by . This book was released on 1976 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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.

Download or read book The Theory of Propellers written by Theodore Theodorsen and published by . This book was released on 1944 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: Summary: A technical method is given for calculating the axial interference velocity of a propeller. The method involves the use of certain weight functions P, Q, and F. Numerical values for the weight functions are given for two-blade, three-blade, and six-blade propellers.

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer. This book was released on 1976 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and dis· seminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) *at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the ac· tivity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all concerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Corporation of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 20 (thesis year 1975) a total of 10,374 theses titles from 28 Canadian and 239 United States universities. We are sure that this broader base for theses titles reported will greatly enhance the value of this important annual reference work. The organization of Volume 20 is identical to that of past years. It consists of theses titles arranged by discipline and by university within each discipline.

Download or read book Risk and Reliability in Geotechnical Engineering written by Kok-Kwang Phoon and published by CRC Press. This book was released on 2018-10-09 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: Establishes Geotechnical Reliability as Fundamentally Distinct from Structural Reliability Reliability-based design is relatively well established in structural design. Its use is less mature in geotechnical design, but there is a steady progression towards reliability-based design as seen in the inclusion of a new Annex D on "Reliability of Geotechnical Structures" in the third edition of ISO 2394. Reliability-based design can be viewed as a simplified form of risk-based design where different consequences of failure are implicitly covered by the adoption of different target reliability indices. Explicit risk management methodologies are required for large geotechnical systems where soil and loading conditions are too varied to be conveniently slotted into a few reliability classes (typically three) and an associated simple discrete tier of target reliability indices. Provides Realistic Practical Guidance Risk and Reliability in Geotechnical Engineering makes these reliability and risk methodologies more accessible to practitioners and researchers by presenting soil statistics which are necessary inputs, by explaining how calculations can be carried out using simple tools, and by presenting illustrative or actual examples showcasing the benefits and limitations of these methodologies. With contributions from a broad international group of authors, this text: Presents probabilistic models suited for soil parameters Provides easy-to-use Excel-based methods for reliability analysis Connects reliability analysis to design codes (including LRFD and Eurocode 7) Maximizes value of information using Bayesian updating Contains efficient reliability analysis methods Accessible To a Wide Audience Risk and Reliability in Geotechnical Engineering presents all the "need-to-know" information for a non-specialist to calculate and interpret the reliability index and risk of geotechnical structures in a realistic and robust way. It suits engineers, researchers, and students who are interested in the practical outcomes of reliability and risk analyses without going into the intricacies of the underlying mathematical theories.

Download or read book Basics and Trends in Sensitivity Analysis Theory and Practice in R written by Sébastien Da Veiga and published by SIAM. This book was released on 2021-10-14 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an overview of global sensitivity analysis methods and algorithms, including their theoretical basis and mathematical properties. The authors use a practical point of view and real case studies as well as numerous examples, and applications of the different approaches are illustrated throughout using R code to explain their usage and usefulness in practice. Basics and Trends in Sensitivity Analysis: Theory and Practice in R covers a lot of material, including theoretical aspects of Sobol’ indices as well as sampling-based formulas, spectral methods, and metamodel-based approaches for estimation purposes; screening techniques devoted to identifying influential and noninfluential inputs; variance-based measures when model inputs are statistically dependent (and several other approaches that go beyond variance-based sensitivity measures); and a case study in R related to a COVID-19 epidemic model where the full workflow of sensitivity analysis combining several techniques is presented. This book is intended for engineers, researchers, and undergraduate students who use complex numerical models and have an interest in sensitivity analysis techniques and is appropriate for anyone with a solid mathematical background in basic statistical and probability theories who develops and uses numerical models in all scientific and engineering domains.

Download or read book The U S Sheep Industry written by Richard P. Stillman and published by . This book was released on 1990 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monte Carlo and Quasi Monte Carlo Methods written by Ronald Cools and published by Springer. This book was released on 2016-06-13 with total page 624 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the refereed proceedings of the Eleventh International Conference on Monte Carlo and Quasi-Monte Carlo Methods in Scientific Computing that was held at the University of Leuven (Belgium) in April 2014. These biennial conferences are major events for Monte Carlo and quasi-Monte Carlo researchers. The proceedings include articles based on invited lectures as well as carefully selected contributed papers on all theoretical aspects and applications of Monte Carlo and quasi-Monte Carlo methods. Offering information on the latest developments in these very active areas, this book is an excellent reference resource for theoreticians and practitioners interested in solving high-dimensional computational problems, arising, in particular, in finance, statistics and computer graphics.

Download or read book Auxiliary power systems papers presented at the Propulsion and Energetics Panel 61st B specialists meeting held in Copenhagen Denmark 30 31 May 1983 written by AGARD. and published by . This book was released on with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Handbook of Engineering Mechanics written by Wilhelm Flugge and published by . This book was released on 2003-01-01 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: