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Contribution A Letude De La Combustion Derriere Un Choc Oblique Hypersonique
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Book Synopsis Contribution à l'étude de la combustion derrière un choc oblique hypersonique by : LACHEBOUR.. HAMADA
Download or read book Contribution à l'étude de la combustion derrière un choc oblique hypersonique written by LACHEBOUR.. HAMADA and published by . This book was released on 1992 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJET DE CE TRAVAIL EST L'ETUDE DE L'EXISTENCE ET DU POSITIONNEMENT DE LA COMBUSTION SOUS FORME DE DETONATION OU DE FLAMME DETACHEE DERRIERE DES ONDES DE CHOC OBLIQUES HYPERSONIQUES (DE NOMBRE DE MACH VARIANT DE 3 A 10) DANS UN MILIEU REACTIF GAZEUX. LA TECHNIQUE DE PRODUCTION DES ONDES DE CHOC OBLIQUES CONSISTE EN L'EXPANSION LATERALE DES PRODUITS DE COMBUSTION DERRIERE UNE ONDE DE DETONATION NORMALE CHAPMAN-JOUGUET D'UN MILIEU PRIMAIRE DANS UN MILIEU SECONDAIRE ADJACENT, MILIEU DE L'ETUDE. LES DEUX MILIEUX SONT SEPARES INITIALEMENT PAR UN FILM DE MYLAR DE TRES FAIBLE EPAISSEUR. LA DEFLECTION DE CE FILM SOUS L'ACTION DES PRODUITS DE DETONATION DU MILIEU PRIMAIRE, CREE UN DIEDRE SE PROPAGEANT A LA MEME VITESSE QUE L'ONDE DE DETONATION CHAPMAN-JOUGUET DE CE MILIEU. L'ETUDE THEORIQUE EFFECTUEE SUR L'INTERACTION DES DEUX MILIEUX EST BASEE SUR UN MODELE DE CALCUL FAISANT INTERVENIR LA THEORIE BIDIMENSIONNELLE DES ECOULEMENTS HYPERSONIQUES ET COMPRESSIBLES POUR DECRIRE LES DIFFERENTES CONFIGURATIONS STATIONNAIRES POSSIBLES AU MOYEN DE POLAIRES DE CHOC ET DE DETONATION D'UNE PART ET DE DETENTE DE PRANDTL-MEYER D'AUTRE PART. L'ETUDE EXPERIMENTALE MET EN EVIDENCE DIFFERENTS REGIMES, STATIONNAIRES OU NON, DE LA COMBUSTION A SAVOIR LA DETONATION OBLIQUE ET LA FLAMME TURBULENTE INITIEE A LA TETE DU DIEDRE ET S'ELOIGNANT DU CHOC, REGIMES DONT L'ETABLISSEMENT DEPEND TRES FORTEMENT DE LA CINETIQUE CHIMIQUE DES MILIEUX ETUDIES. CONCERNANT LES REGIMES DE DETONATIONS STATIONNAIRES ET CERTAINS REGIMES DE FLAMMES DETACHEES, LA PREVISION DU MODELE THEORIQUE S'EST AVEREE BONNE
Book Synopsis Etude des régimes de combustion induite par une onde de choc oblique hypersonique by : Christophe Viguier
Download or read book Etude des régimes de combustion induite par une onde de choc oblique hypersonique written by Christophe Viguier and published by . This book was released on 1996 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: LA PROPULSION D'ENGINS A GRAND NOMBRE DE MACH (CONCEPT DU SUPERSTATOREACTEUR) OU L'ACCELERATION DE PROJECTILE A GRANDE VITESSE (CANON CHIMIQUE) NECESSITE LA CONNAISSANCE DES MECANISMES DE LA COMBUSTION SUPERSONIQUE INDUITE PAR UNE ONDE DE CHOC OBLIQUE. DANS CETTE ETUDE EXPERIMENTALE, NOUS CHERCHONS A ETABLIR COMMENT ET DANS QUELLES CONDITIONS S'INITIENT ET SE STABILISENT LES DIFFERENTS REGIMES DE COMBUSTION DERRIERE UNE ONDE DE CHOC OBLIQUE. AFIN DE SE RAPPROCHER DES CONDITIONS DE FONCTIONNEMENT D'UN ENGIN REEL, NOUS NOUS SOMMES LIMITES A L'ETUDE DES DEUX MELANGES STOECHIOMETRIQUES H#2-AIR ET CH#4-AIR A M VOISIN DE 6, INITIALEMENT AU REPOS ET A LA TEMPERATURE DE 293 K. DE MANIERE GENERALE, LA COMBUSTION SUPERSONIQUE INDUITE PAR UNE ONDE DE CHOC OBLIQUE, PREND LES DEUX FORMES DE BASES SUIVANTES: (I) UNE FLAMME TRES TURBULENTE INITIEE A LA TETE DU DIEDRE ET DECOUPLEE DU CHOC, (II) UNE DETONATION OBLIQUE PLUS OU MOINS DETACHEE DU DIEDRE. UNE PREMIERE APPROCHE SIMPLE BASEE SUR L'ANALYSE DES POLAIRES DE CHOC ET DE DETONATION DU MELANGE ETUDIES PERMET DE PRECISER LES SOLUTIONS STATIONNAIRES POSSIBLES DE LA PROPAGATION SUPERSONIQUE D'UN DIEDRE. LA DIFFERENCE DE COMPORTEMENT DES DEUX MELANGES A ETE MISE EN EVIDENCE SUR LEUR APTITUDE A SUPPORTER OU NON UNE ONDE DE DETONATION OBLIQUE. DANS LE CAS DU MELANGE H#2-AIR, POUR LEQUEL ON OBSERVE L'INITIATION RETARDEE DE LA DETONATION OBLIQUE, NOUS MONTRONS QUE LE DELAI D'APPARITION DE CELLE-CI VARIE COMME LE TEMPS D'INDUCTION CHIMIQUE DE LA REACTION. LA STRUCTURE OBSERVEE A FAIT L'OBJET D'UNE COMPARAISON AVEC UNE SIMULATION BIDIMENSIONNELLE D'UN ECOULEMENT REACTIF SUPERSONIQUE COUPLEE AVEC UNE CINETIQUE CHIMIQUE COMPLEXE. CETTE COMPARAISON A PERMIS D'ANALYSER LES PHENOMENES ASSURANT LA TRANSITION D'UN REGIME CHOC-FLAMME OBLIQUE VERS LE REGIME DE DETONATION OBLIQUE. ENFIN UNE DERNIERE PARTIE DE L'ETUDE EST CONSACREE A L'INFLUENCE DE L'INJECTION LOCALE TURBULENTE SUR L'INITIATION ET LA STABILISATION DES REGIMES DE COMBUSTION DEJA OBSERVES LORSQUE LE MILIEU ETAIT INITIALEMENT AU REPOS
Book Synopsis Contribution à l'étude de la combustion supersonique by : Olivier Guérineau
Download or read book Contribution à l'étude de la combustion supersonique written by Olivier Guérineau and published by . This book was released on 1997 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: La combustion supersonique est bien adaptée à la propulsion des véhicules hypersoniques aérobies. Le statoréacteur àcombustion supersonique (superstatoréacteur) surclasse les systèmes plus classiques (turboreacteur, statoreacteur à combustion subsonique) lorsque le Mach de vol dépasse 7. La conception des foyers à combustion supersonique pose des problèmes fondamentaux et techniques difficiles. Des questions spécifiques posées par l'accrochage par une onde de choc au sein d'un mélange hydrogène-air. Une cinétique réactionnelle complexe est sélectionnée puis utilisée. Elle rend compte des principaux phénomènes caractérisant la combustion de l'hydrogène dans l'air : temps d'allumage, limites d'explosibilité d'un mélange stœchiométrique. Un code volumes finis, résolvant les équations de Navier-Stokes réactives, est adapté aux calculs de combustion supersonique. Les méthodes numériques employées sont exposées : en particulier la description des flux d'Euler par des solveurs approchés de Riemann (méthode de Roe, méthode des courbes de choc, flux d'Osher). Ces méthodes précises se sont cependant révélées délicates à utiliser du fait de la raideur du système. Deux configurations principales de calcul ont été dégagées d'une étude bibliographique des expériences et calculs de combustion faisant intervenir des chocs. Une étude numérique de l'allumage d'une flamme hydrogène-air derrière un disque de mach est présentée pour la première fois. Elle permet d'affirmer que les ondes observées dans les expériences précédemment citées sont des ondes de choc, et non pas des ondes de détonation. La position du disque de mach dépend de la modélisation employée au cours des calculs. La seconde configuration est celle d'un dièdre plonge dans un écoulement prémélangé air-hydrogène d'un nombre de Mach de 3. Les résultats prouvent que des détonations obliques fortes peuvent être stables, cette configuration constituant un mode d'accrochage envisageable pour une flamme. Ils montrent de plus les limites de la théorie classique des polaires de détonation aux hypothèses trop simplificatrices (propriétés thermodynamiques constantes). Enfin un calcul reprenant la première configuration à une température plus élevée met en évidence l'analogue de la réflexion de Mach pour des ondes de détonation. Ces études montrent qu'un tel système peut-être instable. Ces études concernant des situations pouvant se produire au sein de la chambre de combustion d'un superstatoréacteur, mettent en évidence des phénomènes dont il faut tenir compte.
Book Synopsis Méthodes théoriques d'étude des écoulements supersoniques by : P. Carrière
Download or read book Méthodes théoriques d'étude des écoulements supersoniques written by P. Carrière and published by . This book was released on 1957 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution à l'étude des ondes de choc et de combustion sphériques divergentes dans les gaz by : Jacques Brossard (Physicien.)
Download or read book Contribution à l'étude des ondes de choc et de combustion sphériques divergentes dans les gaz written by Jacques Brossard (Physicien.) and published by . This book was released on 1970 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution à l'étude des ondes de choc et de combustion sphériques divergentes dans les gaz by : Jacques Brossard
Download or read book Contribution à l'étude des ondes de choc et de combustion sphériques divergentes dans les gaz written by Jacques Brossard and published by . This book was released on 1970 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Contribution à l'étude des combustions stabilisées sur ondes de choc by : Philippe Gastebois
Download or read book Contribution à l'étude des combustions stabilisées sur ondes de choc written by Philippe Gastebois and published by . This book was released on 1969 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Etude expérimentale de la combustion initiée par effet catalytique d'un mélange hydrogène-air en écoulement supersonique by : Marc Bellenoue
Download or read book Etude expérimentale de la combustion initiée par effet catalytique d'un mélange hydrogène-air en écoulement supersonique written by Marc Bellenoue and published by . This book was released on 1997 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: LE STATOREACTEUR A COMBUSTION EN FLUX SUPERSONIQUE EST L'UN DES PROPULSEUR AEROBIE ENVISAGES POUR LES VEHICULES HYPERSONIQUES (M > 5). LORS DE LA TRANSITION DU REGIME D'ECOULEMENT SUBSONIQUE AU REGIME SUPERSONIQUE DANS LA CHAMBRE DE COMBUSTION, LES CONDITIONS A L'ENTREE DE CELLE-CI N'AUTORISENT PAS L'INFLAMMATION SPONTANEE DU CARBURANT (HYDROGENE). LE BUT DES TRAVAUX PRESENTES DANS CE MEMOIRE EST, D'UNE PART, LA MISE AU POINT D'UN PROCEDE D'INITIATION DE LA COMBUSTION LORS DE CETTE TRANSITION, D'AUTRE PART, L'ETUDE DU DEVELOPPEMENT DE LA COMBUSTION D'UN PREMELANGE D'HYDROGENE ET D'AIR. UNE SOUFFLERIE SUPERSONIQUE A HAUTE TEMPERATURE GENERATRICE A ETE REALISEE A CETTE FIN. UN MODELE NUMERIQUE MONODIMENSIONNEL A ETE ELABORE AFIN DE DEDUIRE, DES REPARTITIONS DE PRESSIONS PARIETALES, LE RENDEMENT DE COMBUSTION. L'INSTALLATION D'UNE PLAQUE CATALYTIQUE DE PLATINE PUR EN PAROI A PERMIS D'ETUDIER L'INITIATION ET LE DEVELOPPEMENT DE LA COMBUSTION POUR DES RICHESSES DE 0,13 A 0,21. UN TEL CATALYSEUR A ETE CHOISI AFIN DE PALLIER AU PHENOMENE DE FRITTAGE QUI SE PRODUIT A HAUTE TEMPERATURE. L'ETUDE DE DEUX LONGUEURS DE PLAQUES CATALYTIQUES A MONTRE LE ROLE ESSENTIEL DE CE PARAMETRE SUR LE PROCESSUS D'ALLUMAGE. EN OUTRE, L'IMPORTANCE DES PERTES DE CHALEURS AUX PAROIS A EGALEMENT ETE MISE EN EVIDENCE. CE TRAVAIL A ETE COMPLETE PAR LA DEFINITION D'UN DISPOSITIF PASSIF AERODYNAMIQUE D'AMELIORATION DES TAUX DE MELANGE DES COUCHES CISAILLEES SUPERSONIQUES ; SON PRINCIPE CONSISTE A GENERER DES TOURBILLONS DONT L'AXE EST PARALLELE A LA DIRECTION PRINCIPALE DES ECOULEMENTS. L'INFLUENCE DE L'INCIDENCE DES GENERATEURS DE TOURBILLONS A ETE EXAMINEE. LE DISPOSITIF A ENSUITE ETE ADAPTE AU CAS REACTIF AFIN D'ACCROITRE LE RENDEMENT DE LA COMBUSTION. IL S'EST AVERE TRES EFFICACE PUISQUE, POUR DES RICHESSES SUPERIEURES A 0,19, L'EMBALLEMENT DE LA COMBUSTION A ETE OBSERVE
Book Synopsis Contribution à l'étude de l'écoulement hypersonique d'un gaz hors d'équilibre vibratoire, autour d'un dièdre by : J. C. Loraud
Download or read book Contribution à l'étude de l'écoulement hypersonique d'un gaz hors d'équilibre vibratoire, autour d'un dièdre written by J. C. Loraud and published by . This book was released on 19?? with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vortex Flows and Related Numerical Methods by : J.T. Beale
Download or read book Vortex Flows and Related Numerical Methods written by J.T. Beale and published by Springer Science & Business Media. This book was released on 2013-04-18 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many important phenomena in fluid motion are evident in vortex flow, i.e., flows in which vortical structures are significant in determining the whole flow. This book, which consists of lectures given at a NATO ARW held in Grenoble (France) in June 1992, provides an up-to-date account of current research in the study of these phenomena by means of numerical methods and mathematical modelling. Such methods include Eulerian methods (finite difference, spectral and wavelet methods) as well as Lagrangian methods (contour dynamics, vortex methods) and are used to study such topics as 2- or 3-dimensional turbulence, vorticity generation by solid bodies, shear layers and vortex sheets, and vortex reconnection. For researchers and graduate students in computational fluid dynamics, numerical analysis, and applied mathematics.
Book Synopsis Combustion, Flames and Explosions of Gases by : Bernard Lewis
Download or read book Combustion, Flames and Explosions of Gases written by Bernard Lewis and published by Academic Press. This book was released on 2013-10-22 with total page 754 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combustion, Flames, and Explosions of Gases, Second Edition focuses on the processes, methodologies, and reactions involved in combustion phenomena. The publication first offers information on theoretical foundations, reaction between hydrogen and oxygen, and reaction between carbon monoxide and oxygen. Discussions focus on the fundamentals of reaction kinetics, elementary and complex reactions in gases, thermal reaction, and combined hydrogen-carbon monoxide-oxygen reaction. The text then elaborates on the reaction between hydrocarbons and oxygen and combustion waves in laminar flow. The manuscript tackles combustion waves in turbulent flow and air entrainment and burning of jets of fuel gases. Topics include effect of turbulence spectrum and turbulent wrinkling on combustion wave propagation; ignition of high-velocity streams by hot solid bodies; burners with primary air entrainment; and description of jet flames. The book then takes a look at detonation waves in gases; emission spectra, ionization, and electric-field effects in flames; and methods of flame photography and pressure recording. The publication is a valuable reference for readers interested in combustion phenomena.
Book Synopsis Nonsteady Flame Propagation by : George H. Markstein
Download or read book Nonsteady Flame Propagation written by George H. Markstein and published by Elsevier. This book was released on 2014-12-02 with total page 339 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonsteady Flame Propagation provides information pertinent to flame propagation in gaseous media. This book focuses on linearized treatments and the comparison of their results with experimental observations. Organized into nine chapters, this book begins with an overview of the challenge of nonlinear problems and examines the essentially nonlinear character of the flame phenomena, which has been artificially suppressed in analyses by the use of linearized perturbation treatments. This text then summarizes the development regarding rocket-shaped burners. Other chapters consider the advantages as well as the limitations of linearized analyses. This book discusses as well a general treatment of the discontinuous-flame-front model and summarizes the results of studies of burner that use secondary air. The final chapter deals with re-examining the possibilities of using pulsating combustion in propulsion or in other applications. This book is a valuable resource for chemical engineers, chemists, scientists, and research workers.
Download or read book Satellite Situation Report written by and published by . This book was released on 1978-12 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis IUTAM Symposium on Variable Density Low-Speed Turbulent Flows by : Louis Fulachier
Download or read book IUTAM Symposium on Variable Density Low-Speed Turbulent Flows written by Louis Fulachier and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: The General Assembly of the International Union of Theoretical and Applied Mechanics in its meeting on August 28, 1994, selected for 1996 only four Mechanics Symposia, of which ours is the only one related to Fluid Mechanics: Variable Density Low Speed Turbulent Flows. This IUTAM Symposium, organized by the Institut de Recherche sur les Phenomenes Hors Equilibre (Marseille), is the logical continuation of the meetings previously organized or co-organized - on the French or European level, such as Euromech 237, Marseille, 1988 - by the same research group ofMarseille. This meeting focused specifically on the structure of turbulent flows in which density varies strongly : the effect of this variation on the velocity and scalar fields is in no sense negligible. We were mainly concerned with low-speed flows subjected to strong local changes of density as a consequence of heat or mass transfer or of chemical reactions. Compressible turbulent flows - such a!" supersonic ones - were also considered in order to underline their similarities to and their differences from low-speed variable density flows.
Book Synopsis Shock Waves Science and Technology Library, Vol. 6 by : F. Zhang
Download or read book Shock Waves Science and Technology Library, Vol. 6 written by F. Zhang and published by Springer Science & Business Media. This book was released on 2012-03-28 with total page 482 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book, as a volume of the Shock Wave Science and Technology Reference Library, is primarily concerned with the fundamental theory of detonation physics in gaseous and condensed phase reactive media. The detonation process involves complex chemical reaction and fluid dynamics, accompanied by intricate effects of heat, light, electricity and magnetism - a contemporary research field that has found wide applications in propulsion and power, hazard prevention as well as military engineering. The seven extensive chapters contained in this volume are: - Chemical Equilibrium Detonation (S Bastea and LE Fried) - Steady One-Dimensional Detonations (A Higgins) - Detonation Instability (HD Ng and F Zhang) - Dynamic Parameters of Detonation (AA Vasiliev) - Multi-Scaled Cellular Detonation (D Desbordes and HN Presles) - Condensed Matter Detonation: Theory and Practice (C Tarver) - Theory of Detonation Shock Dynamics (JB Bdzil and DS Stewart) The chapters are thematically interrelated in a systematic descriptive approach, though, each chapter is self-contained and can be read independently from the others. It offers a timely reference of theoretical detonation physics for graduate students as well as professional scientists and engineers.
Book Synopsis The Cambridge Aerospace Dictionary by : Bill Gunston
Download or read book The Cambridge Aerospace Dictionary written by Bill Gunston and published by Cambridge University Press. This book was released on 2011-02-14 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cambridge Aerospace Dictionary is an authoritative and accessible reference useful to scholars and enthusiasts alike. This dictionary is an essential tool for professionals involved in the aerospace industry and flight, and for anyone who must read and understand the technical literature of the aerospace industry and about specific air and space craft. It is also an ideal reference for engineering and physics students encountering a subject replete with technical jargon and acronyms. Bill Gunston, one of the most widely read and respected aviation writers, has added more than 5,000 new terms and acronyms to this carefully updated volume. Terms used in the dictionary reflect the diverse and international nature of the aerospace industry and include brief explanations of aerospace materials and organizations. Gunston has scrupulously avoided terms specific to manufacturers, airlines, and armed forces in an effort to encourage clear communication and understanding among professionals.
Book Synopsis Numerical Simulation of Reactive Flow by : Elaine S. Oran
Download or read book Numerical Simulation of Reactive Flow written by Elaine S. Oran and published by Cambridge University Press. This book was released on 2001 with total page 553 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reactive flows encompass a broad range of physical phenomena, interacting over many different time and space scales. Such flows occur in combustion, chemical lasers, the earth's oceans and atmosphere, and stars and interstellar space. Despite the obvious physical differences in these flows, there is a striking similarity in the forms of their descriptive equations. Thus, the considerations and procedures for constructing numerical models of these systems are also similar, and these similarities can be exploited. Moreover, using the latest technology, what were once difficult and expensive computations can now be done on desktop computers. This book takes account of the explosive growth in computer technology and the greatly increased capacity for solving complex reactive flow problems that have occurred since the first edition of Numerical Simulation of Reactive Flow was published in 1987. It presents algorithms useful for reactive flow simulations, describes trade-offs involved in their use, and gives guidance for building and using models of complex reactive flows.
