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Phenomenes Dallumage Dun Foyer De Turbomachine En Conditions De Haute Altitude
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Book Synopsis Phénomènes d'allumage d'un foyer de turbomachine en conditions de haute altitude by : Nicolás García Rosa
Download or read book Phénomènes d'allumage d'un foyer de turbomachine en conditions de haute altitude written by Nicolás García Rosa and published by . This book was released on 2008 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'allumage d'un foyer aérobie en conditions de haute altitude (basse pression, basse température d'air et de kérosène) est difficile à réaliser. Le domaine de rallumage en vol est à la fois un critère dimensionnant, imposant le volume de la chambre dès le stade d'avant-projet, et une exigence de certification du moteur. Le développement du domaine de vol des turbomachines aéronautiques repose sur l'amélioration des outils numériques de prévision des plages de stabilité des chambres de combustion. Les principaux enjeux de la modélisation de l'allumage résident dans son fort caractère instationnaire, dans une dynamique d'échelle importante et dans le couplage d'un grand nombre de phénomènes physiques. L'objectif de ce travail est de contribuer à l'amélioration et la validation de la méthodologie de simulation numérique de l'allumage d'un foyer de turbomachine. Des essais sont conduits dans un foyer académique avec de grands accès optiques, alimenté par un injecteur industriel. L'écoulement gazeux, puis diphasique avant et après l'allumage est caractérisé à l'aide de diagnostics optiques et de visualisations à haute cadence, en conditions ambiantes et à basse pression. Ces résultats sont comparés à des simulations numériques RANS conduites avec le code CEDRE de l’ONERA, et aux simulations LES réalisées par le CERFACS. En parallèle, le modèle de noyau diphasique d'allumage, proposé par les travaux précédents pour décrire les premiers instants de la propagation de la flamme, a été amélioré et intégré au code CEDRE. Une étude paramétrique sur une configuration académique a été confrontée avec la littérature afin de proposer une première validation et d'améliorer la compréhension du phénomène. Son intégration dans la simulation numérique permet de sonder un écoulement à la recherche des positions optimales pour l'allumeur comme le montrent les premiers résultats obtenus par Turbomeca. Ce modèle permettra également l'introduction de points chauds réalistes pour l'étude détaillée de la propagation du noyau au reste du foyer. Ces premiers résultats constituent le début d'une base de données de référence pour l'étude de l'allumage dans des conditions réalistes.
Book Synopsis Étude expérimentale et numérique de l'allumage des turboréacteurs en conditions de haute altitude by : Guillaume Linassier
Download or read book Étude expérimentale et numérique de l'allumage des turboréacteurs en conditions de haute altitude written by Guillaume Linassier and published by . This book was released on 2012 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le développement et la certification de systèmes propulsifs aéronautiques nécessitent une phase d'essais sur banc moteur. Ces essais permettent entre autres de caractériser les limites d'allumage des foyers de combustion de turbomachines, mais sont extrêmement coûteux et générateurs de délais pour l'industriel. Afin de limiter leur recours, il est nécessaire de développer des méthodes permettant de prévoir de la façon la plus fiable possible les performances d'allumage d'un prototype de chambre de combustion, et ce aussi bien pour des conditions de décollage au niveau de la mer que pour le cas critique de la haute altitude.L'objectif de cette thèse est de contribuer au développement et à la validation d’outils numériques pour la prévision de l'allumage des foyers de combustion à partir de données expérimentales obtenues sur le banc MERCATO de l’ONERA. Ces travaux ont été conduits en étroite coopération avec TURBOMECA. Des améliorations ont été apportées à un modèle permettant de simuler l'allumage d'un brouillard de carburant suite à un dépôt d'énergie par bougie à arc électrique. Ce modèle a été couplé à un code de calcul multiphysique (code CEDRE) afin d'établir des cartographies d'allumage à partir d'un champ aérodiphasique moyenné, mais également de simuler la phase de propagation de la flamme à l’ensemble du foyer par approche RANS pseudo-stationnaire. Afin de valider ces deux approches, une caractérisation expérimentale d'une maquette de chambre mono-secteur a été réalisée sur le banc d'essai MERCATO. Ces essais ont permis de constituer une banque de données très fournie pour différents cas tests. La comparaison de la cartographie d’allumage expérimentale à celle fournie par la simulation numérique donne des résultats très satisfaisants et encourageants en vue d’une application à un foyer réel de turbomachine. En parallèle, des résultats très prometteurs ont été obtenus sur une nouvelle maquette de chambre de combustion trisecteur,dérivée d'un foyer industriel, permettant de comparer ses limites d’allumage à celles obtenues sur la chambre réelle. Cette configuration fera l’objet par la suite d’une étude détaillée de la propagation de la flamme intersecteurs, impossible à réaliser sur la géométrie d'un foyer annulaire complet.
Book Synopsis Selected Combustion Problems, II: Transport Phenomena, Ignition, Altitude Behaviour and Scaling of Aeroengines by :
Download or read book Selected Combustion Problems, II: Transport Phenomena, Ignition, Altitude Behaviour and Scaling of Aeroengines written by and published by . This book was released on 1956 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development Publisher : ISBN 13 : Total Pages :542 pages Book Rating :4.3/5 (91 download)
Book Synopsis Selected Combustion Problems, II by : North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development
Download or read book Selected Combustion Problems, II written by North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development and published by . This book was released on 1956 with total page 542 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Particles in Turbulent Flows by : Leonid I. Zaichik
Download or read book Particles in Turbulent Flows written by Leonid I. Zaichik and published by John Wiley & Sons. This book was released on 2008-12-04 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: The only work available to treat the theory of turbulent flow with suspended particles, this book also includes a section on simulation methods, comparing the model results obtained with the PDF method to those obtained with other techniques, such as DNS, LES and RANS. Written by experienced scientists with background in oil and gas processing, this book is applicable to a wide range of industries -- from the petrol industry and industrial chemistry to food and water processing.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher : ISBN 13 : Total Pages :538 pages Book Rating :4.:/5 (31 download)
Book Synopsis Combustion and Propulsion by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Download or read book Combustion and Propulsion written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1953 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Combustion and Propulsion [Papers̈ by :
Download or read book Combustion and Propulsion [Papers̈ written by and published by . This book was released on 1956 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Handbook of Physical Properties of Liquids and Gases by : N.B. Vargaftik
Download or read book Handbook of Physical Properties of Liquids and Gases written by N.B. Vargaftik and published by Springer. This book was released on 2014-04-13 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides numerical data on physical and thermodynamic properties of a large number of elements and compounds. SI units are used throughout, and in addition, an adequate set of conversion tables is included. This volume will be a valuable source of reference for physical chemists and chemical engineers.
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.
Download or read book Swirl Flows written by Ashwani K. Gupta and published by Routledge. This book was released on 1984 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Combustion and Flames by : Roland Borghi
Download or read book Combustion and Flames written by Roland Borghi and published by Editions Technips. This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Professionals 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.
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:
Book Synopsis NSWC TR. by : Naval Surface Weapons Center
Download or read book NSWC TR. written by Naval Surface Weapons Center and published by . This book was released on 1979 with total page 68 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:
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium Publisher : ISBN 13 :9789283505297 Total Pages :0 pages Book Rating :4.5/5 (52 download)
Book Synopsis Aircraft Fire Safety by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium
Download or read book Aircraft Fire Safety written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Conference Proceedings contains 38 papers presented at the Propulsion and Energetics Panel 73rd Symposium on 'Aircraft Fire Safety' which was held 22 - 26 May 1989 in Sintra, Portugal. The Symposium was arranged in the following sessions: Review of Fire-Related Aircraft Accidents (3); Fire Safety Standards and Research Programmes (6); Aircraft Internal Fires (9); Aircraft External Fires (2); Fire Safety of Military Weapon Systems (3); Fire Hardening by Advanced Materials and Structural Design (8); Passenger Behaviour in Emergency Situations (3); and Passenger Protective Equipment (4). The Technical Evaluation Report and and Addendum are included at the beginning of the Proceedings. Questions and answers of the discussions follow each paper. The last AGARD review on the subject took place in a Specialists' Meeting in 1975, followed by a Working Group Report in 1979 and Lecture Series in 1982. The purpose of the Symposium was a review of the present state-of-the-art and of the last improvements. Although the safety standards in aviation are already very high, there is still room for improvements. They are listed in the Conclusions and Recommendations of the Technical Evaluation Report and in the Addendum.
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development Publisher : ISBN 13 :9789283506591 Total Pages : pages Book Rating :4.5/5 (65 download)
Book Synopsis AGARD Conference Proceedings by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development
Download or read book AGARD Conference Proceedings written by North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
