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Contribution Au Developpement De Lallumage Par Laser Pour Les Moteurs A Combustion Interne
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Book Synopsis Contribution au développement de l'allumage par laser pour les moteurs à combustion interne by : Cyprien Ternel
Download or read book Contribution au développement de l'allumage par laser pour les moteurs à combustion interne written by Cyprien Ternel and published by . This book was released on 2006 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Avec les nouvelles stratégies de combustion, la bougie atteint les limites de son potentiel. Nous avons travaillé sur un nouveau type d'allumage : l'allumage laser. Nous avons caractérisé la nature du plasma laser. La valeur seuil d'irradiance qui déclenche le claquage est d'environ 50GW/cm2. Nos essais d'allumage ont soulevé le problème de raté de combustion pour les milieux fortement dilués. La présence seule du plasma n'entraîne pas un allumage réussi. Le but est aussi d'apporter une source suffisamment volumineuse, supérieure au volume critique d'allumage, qui a été déterminé de façon théorique. Deux lasers ont été testés sur moteur : un laser de puissance et un laser compact afin d'étudier la faisabilité de l'implantation d'un tel système. L'analyse de combustion montre que le plasma entraîne une initiation plus stable. Aucun effet mémoire de la qualité de l'allumage sur la propagation de la flamme n'a été mis en évidence. Des essais en fonctionnement stratifié ont aussi été effectués.
Book Synopsis Stabilization and Dynamic of Premixed Swirling Flames by : Paul Palies
Download or read book Stabilization and Dynamic of Premixed Swirling Flames written by Paul Palies and published by Academic Press. This book was released on 2020-07-03 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Stabilization and Dynamic of Premixed Swirling Flames: Prevaporized, Stratified, Partially, and Fully Premixed Regimes focuses on swirling flames in various premixed modes (stratified, partially, fully, prevaporized) for the combustor, and development and design of current and future swirl-stabilized combustion systems. This includes predicting capabilities, modeling of turbulent combustion, liquid fuel modeling, and a complete overview of stabilization of these flames in aeroengines. The book also discusses the effects of the operating envelope on upstream fresh gases and the subsequent impact of flame speed, combustion, and mixing, the theoretical framework for flame stabilization, and fully lean premixed injector design. Specific attention is paid to ground gas turbine applications, and a comprehensive review of stabilization mechanisms for premixed, partially-premixed, and stratified premixed flames. The last chapter covers the design of a fully premixed injector for future jet engine applications. Features a complete view of the challenges at the intersection of swirling flame combustors, their requirements, and the physics of fluids at work Addresses the challenges of turbulent combustion modeling with numerical simulations Includes the presentation of the very latest numerical results and analyses of flashback, lean blowout, and combustion instabilities Covers the design of a fully premixed injector for future jet engine applications
Book Synopsis Etude à l'allumage par laser de mélanges en phases liquides dispersées et gazeuses by : Hazem El-Rabii
Download or read book Etude à l'allumage par laser de mélanges en phases liquides dispersées et gazeuses written by Hazem El-Rabii and published by . This book was released on 2004 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'étude de l'allumage d'un mélange gazeux combustible/comburant est d'un intérêt fondamental et d'une importance cruciale dans les moteurs à combustion interne et dans les turbines à gaz. Une nouvelle méthode d'allumage, récemment utilisée, consiste à créer une étincelle par focalisation d'un faisceau laser. 'Objectif du présent travail est d'effectuer une étude paramétrique de ce mode d'allumage pour des mélanges en phases liquides dispersées et gazeuses, ainsi que d'apporter une contribution à la compréhension des phénomènes physiques liés au claquage optique, aussi bien dans l'air que dans les mélanges inflammables. Les plasmas rencontrés sont caractérisés, en termes de concentrations et de températures électroniques, avant d'aborder l'étude paramétrique du claquage dans l'air et de l'allumage des mélanges gazeux et diphasiques inflammables. L'importance de la dynamique induite par l'étincelle laser sur l'évolution de la structure et de la forme du noyau d'allumage est considérée. Le rôle des aberrations, et en particulier de l'aberration sphérique, est soigneusement étudié du point de vue théorique. Des conclusions importantes sur l'interprétation des résultats expérimentaux sont dégagées. La détermination des seuils de claquage, ainsi que l'identification des processus déterminants, sont analysés à la lumière d'un modèle basé sur la détermination de l'évolution de la concentration d'électrons libres dans le volume focal. Finalement, la faisabilité de l'allumage laser à la sortie d'un injecteur prévaporisé, prémélangé en régime pauvre est démontrée.
Book Synopsis Développement de L'Allumage Laser by : Cyprien Ternel
Download or read book Développement de L'Allumage Laser written by Cyprien Ternel and published by Omniscriptum. This book was released on 2011-09 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Avec les nouvelles stratégies de combustion, la bougie atteint les limites de son potentiel. Nous avons travaillé sur un nouveau type d'allumage: l'allumage laser. Nous avons caractérisé la nature du plasma laser. La valeur seuil d'irradiance qui déclenche le claquage est de 50 GW/cm2. Nos essais d'allumage ont soulevé le problème de raté de combustion pour les milieux fortement dilués. La présence seule du plasma n'entraîne pas un allumage réussi. Le but est aussi d'apporter une source suffisamment volumineuse, supérieure au volume critique d'allumage, qui a été déterminé de façon théorique. Deux lasers ont été testés sur moteur: un laser de puissance et un laser compact afin d'étudier la faisabilité de l'implantation d'un tel système. L'analyse de combustion montre que le plasma entraîne une initiation plus stable. Aucun effet mémoire de la qualité de l'allumage sur la propagation de la flamme n'a été mis en évidence. Des essais en fonctionnement stratifié ont aussi été effectués.
Book Synopsis Laser Ignition of Internal Combustion Engines by : Martin Weinrotter
Download or read book Laser Ignition of Internal Combustion Engines written by Martin Weinrotter and published by GRIN Verlag. This book was released on 2011-03-31 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: Doctoral Thesis / Dissertation from the year 2006 in the subject Electrotechnology, grade: 1, mit Ausgezeichnung bestanden, Vienna University of Technology (Insitut für Photonik), language: English, abstract: In this PhD thesis different fundamental aspects and the practical usability of a laser ignition system as a new, innovative and alternative ignition approach for internal combustion engines were investigated in great detail mainly experimentally. Ignition experiments in combustion chambers under high pressures and elevated temperatures have been conducted. Different fuels were investigated. Also the minimum breakdown energy in dependence of the initial temperature and pressure with the help of an aspheric lens with a high numerical aperture was studied. High-speed Schlieren diagnostics have been conducted in the combustion chamber. The different stages like the ignition plasma within the first nanoseconds via the shock wave generation to the expanding flame kernel were investigated. With the help of multi-point ignition the combustion duration could be reduced significantly. The controlled start of auto-ignition of n-heptane-air mixtures by resonant absorption of Er,Cr:YSGG laser radiation at 2.78 μm by additionally introduced water has been proven in combustion chamber experiments as a completely new idea. Beside experiments in the combustion chambers and long term tests under atmospheric conditions, various tests in SI engines up to 200 h, have been made. Different sources of contamination of the window surface have been identified. First experiments with a longitudinally diode-pumped, fiber-coupled and passively Q-switched solid-state laser α-prototype system with maximum pulse energy of 1.5 mJ at about 1.5 ns pulse duration were performed which allowed to ignite the engine successfully over a test period of 100 h. In cooperation with Lund University in Sweden, experiments have been performed on another engine test bed running in HCCI mode revealing the laser spark to be able to stimulate the auto-ignition process and to trigger the onset of combustion. In another international cooperation conducted with the Southwest Research Institute in Texas, U.S.A., the potential of laser ignition in combination with the so called HEDGE concept was studied. As a final direction of the work, first calculations and experiments of a β- prototype ignition laser of an own design have been conducted. The concept of a longitudinally diode-pumped, fiber-coupled and passively Q-switched solid-state laser was chosen as the most promising. Emitted pulse energy of 2 mJ within around 1 ns pulse duration was achieved easily allowing generating a laser-induced breakdown in air.
Book Synopsis Développement de la technique "Incandescence Induite par Laser" pour caractériser les particules de suies dans un moteur Diesel by : Andrei Boiarciuc
Download or read book Développement de la technique "Incandescence Induite par Laser" pour caractériser les particules de suies dans un moteur Diesel written by Andrei Boiarciuc and published by . This book was released on 2006 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt: Une contribution au développement de la technique « Laser-Induced Incandescence » (LII) a été apportée dans le but de quantifier d’une manière non intrusive les suies dans la chambre de combustion d’un moteur Diesel dit « transparent » et d’améliorer ainsi la compréhension de la formation des particules lors du processus de combustion spécifique à ces moteurs. Cette technique, dont le principe est basé sur l’analyse du rayonnement émis par des particules chauffées par un laser permet d’estimer avec une bonne résolution temporelle et spatiale des concentrations de suies et des tailles des particules dans des milieux réactifs. Une approche originale de cette technique, consistant en l’acquisition simultanée d’une image LII et de l’évolution temporelle du signal LII filtré à deux longueurs d’onde, a été mise en place et utilisée pour caractériser quantitativement les particules dans des flammes de diffusion laminaires et dans la chambre de combustion du moteur Diesel « transparent ». Une attention particulière a été accordée à la modélisation des échanges de chaleur au niveau des particules de suies le long du processus LII afin de pouvoir, par la suite, estimer leurs tailles. Deux approches de modélisation du signal LII sont présentées et analysées : la première pour des particules situées à la pression atmosphérique et la seconde caractéristique des milieux à pression relativement importante, comme dans la chambre de combustion d’un moteur Diesel. L’évolution de la concentration des suies et des tailles des particules dans la chambre de combustion du moteur Diesel selon les conditions de recirculation des gaz d'échappement a été étudiée à l'aide de la technique LII.
Author :John Henry Lorentz Publisher :Historical Dictionaries of Asia, Oceania, and the Middle East ISBN 13 : Total Pages :570 pages Book Rating :4.F/5 ( download)
Book Synopsis Historical Dictionary of Iran by : John Henry Lorentz
Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.
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 Building Wireless Community Networks by : Rob Flickenger
Download or read book Building Wireless Community Networks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: Building Wireless Community Networks is about getting people online using wireless network technology. The 802.11b standard (also known as WiFi) makes it possible to network towns, schools, neighborhoods, small business, and almost any kind of organization. All that's required is a willingness to cooperate and share resources. The first edition of this book helped thousands of people engage in community networking activities. At the time, it was impossible to predict how quickly and thoroughly WiFi would penetrate the marketplace. Today, with WiFi-enabled computers almost as common as Ethernet, it makes even more sense to take the next step and network your community using nothing but freely available radio spectrum. This book has showed many people how to make their network available, even from the park bench, how to extend high-speed Internet access into the many areas not served by DSL and cable providers, and how to build working communities and a shared though intangible network. All that's required to create an access point for high-speed Internet connection is a gateway or base station. Once that is set up, any computer with a wireless card can log onto the network and share its resources. Rob Flickenger built such a network in northern California, and continues to participate in network-building efforts. His nuts-and-bolts guide covers: Selecting the appropriate equipment Finding antenna sites, and building and installing antennas Protecting your network from inappropriate access New network monitoring tools and techniques (new) Regulations affecting wireless deployment (new) IP network administration, including DNS and IP Tunneling (new) His expertise, as well as his sense of humor and enthusiasm for the topic, makes Building Wireless Community Networks a very useful and readable book for anyone interested in wireless connectivity.
Download or read book Wireless Hacks written by Rob Flickenger and published by "O'Reilly Media, Inc.". This book was released on 2003 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt: Continuing with the successful Hack Series, this title provides real-world working examples of how to make useful things happen with wireless equipment.
Book Synopsis Historical Dictionary of Pakistan by : Shahid Javed Burki
Download or read book Historical Dictionary of Pakistan written by Shahid Javed Burki and published by . This book was released on 1999 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pakistan is unlike most other countries in the emerging world. It is one of the two nations – the other being the state of Israel – founded on the basis of religion. Although it was created to provide a homeland for the Muslim community of British India, in its original form it was able to accommodate only about half of the people of Islamic faith who lived in the subcontinent. Pakistan’s birth in 1947 resulted in one of the largest movements of people in human history when some 14 million people left their homes, with 8 million Muslims leaving India for what is now Pakistan and 6 million Hindus and Sikhs moving in the opposite direction. This was the first large-scale incidence of ethnic cleansing the world was to witness. --
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium Publisher : ISBN 13 : Total Pages :344 pages Book Rating :4.E/5 ( 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 1997 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contact With Space: Oranur; Second Report 1951 - 1956 by : Wilhelm Reich
Download or read book Contact With Space: Oranur; Second Report 1951 - 1956 written by Wilhelm Reich and published by . This book was released on 2018-10-27 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wilhelm Reich's final publication, Contact With Space contains the result of six years of intensive research and field work: a natural scientific account of and the basis of practical measures for combating the DOR emergency. This volume is an exposition of the newest developments in the technology of Cosmic Orgone Engineering, which involve the use of "Spacegun," an extension of the cloudbuster made possible by the discovery of ORUR.During Reich's scientific expedition to southern Arizona (1954-1955)--which he documents in this book--it was Cosmic Orgone Engineering that caused desert land to turn green with prairie grass. Here Reich submits a natural scientific explanation of the metabolism of the Life Energy, a study which goes into the nature of primal vegetation, and the nature of dying or death of vegetation, i.e., desert development.Nature being one, Contact With Space examines the new basic energetic facts brought into the open by the Oranur Experiment in terms of the various branches of science into which they ramify: biophysics, Oranur medicine, astrophysics, meteorology, chemistry and pre-atomic chemistry, space technology, man's reactions to these events, etc. It also deals with the methods of the functional scientist.Written under unrelenting attack from conspiratorial commercial interests, this book gives some of the background into the difficult social and physical milieu in which this research was done, and conveys the excitement of the adventures that began the cosmic or "atomic" age.
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:
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:
Author :North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium Publisher : ISBN 13 :9789283505945 Total Pages :472 pages Book Rating :4.5/5 (59 download)
Book Synopsis Hypersonic Combined Cycle Propulsion by : North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Propulsion and Energetics Panel. Symposium
Download or read book Hypersonic Combined Cycle Propulsion 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 1990 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt:
