Download or read book ETUDE DE L INTERACTION TURBULENCE COMBUSTION DANS LE CADRE D UNE FLAMME OBLIQUE written by ALLAL.. RACHID and published by . This book was released on 1984 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: APRES UN RAPPEL DES CONNAISSANCES ACTUELLES SUR LA COMBUSTION TURBULENTE, L'AUTEUR DECRIT LES DISPOSITIFS DE MESURE MIS AU POINT POUR AUGMENTER LA PRECISION DES MESURES ET ELIMINER LES PARAMETRES SPECIFIQUES D'EXPERIENCE QUI GENE LES COMPARAISONS. LES RESULTATS EXPERIMENTAUX OBTENUS SUR DES FLAMMES DE PREMELANGE AIR-HYDROGENE, SERVENT DE BASE A L'INTERPRETATION PHYSIQUE DES PHENOMENES RENCONTRES: CLARIFICATION DE LA VITESSE DE COMBUSTION, ET DU PROCESSUS DE DEVIATION DES FILETS FLUIDES CONDUISANT A UNE ACCELERATION ET A LA MODIFICATION DU CHAMP TURBULENT

Download or read book tude de l interaction turbulence combustion dans le cadre d une flame oblique written by Rachid Allal and published by . This book was released on 1984 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling and Simulation of Turbulent Combustion written by Santanu De and published by Springer. This book was released on 2017-12-12 with total page 663 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a comprehensive review of state-of-the-art models for turbulent combustion, with special emphasis on the theory, development and applications of combustion models in practical combustion systems. It simplifies the complex multi-scale and nonlinear interaction between chemistry and turbulence to allow a broader audience to understand the modeling and numerical simulations of turbulent combustion, which remains at the forefront of research due to its industrial relevance. Further, the book provides a holistic view by covering a diverse range of basic and advanced topics—from the fundamentals of turbulence–chemistry interactions, role of high-performance computing in combustion simulations, and optimization and reduction techniques for chemical kinetics, to state-of-the-art modeling strategies for turbulent premixed and nonpremixed combustion and their applications in engineering contexts.

Download or read book Turbulent Combustion Modeling written by Tarek Echekki and published by Springer Science & Business Media. This book was released on 2010-12-25 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: Turbulent combustion sits at the interface of two important nonlinear, multiscale phenomena: chemistry and turbulence. Its study is extremely timely in view of the need to develop new combustion technologies in order to address challenges associated with climate change, energy source uncertainty, and air pollution. Despite the fact that modeling of turbulent combustion is a subject that has been researched for a number of years, its complexity implies that key issues are still eluding, and a theoretical description that is accurate enough to make turbulent combustion models rigorous and quantitative for industrial use is still lacking. In this book, prominent experts review most of the available approaches in modeling turbulent combustion, with particular focus on the exploding increase in computational resources that has allowed the simulation of increasingly detailed phenomena. The relevant algorithms are presented, the theoretical methods are explained, and various application examples are given. The book is intended for a relatively broad audience, including seasoned researchers and graduate students in engineering, applied mathematics and computational science, engine designers and computational fluid dynamics (CFD) practitioners, scientists at funding agencies, and anyone wishing to understand the state-of-the-art and the future directions of this scientifically challenging and practically important field.

Download or read book Contribution l tude de l interaction turbulence combustion dans les flammes turbulentes de pr m lange l aide de mod les du second ordre written by Pascal Bailly and published by . This book was released on 1996 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt: ON CONSIDERE LA MODELISATION DE L'INTERACTION ENTRE TURBULENCE ET COMBUSTION DANS LE CAS DES FLAMMES TURBULENTES DE PREMELANGE OU LE REGIME DE FLAMMELETTES S'APPLIQUE. DANS CE REGIME, LE PROCESSUS DE COMBUSTION EST CONTROLE MAJORITAIREMENT PAR LE MELANGE TURBULENT. DANS CERTAINES SITUATIONS, DES EFFETS DE DIFFUSION TURBULENTE NON-GRADIENT, VOIRE A CONTRE GRADIENT, PEUVENT APPARAITRE CONDUISANT A UNE FORTE PRODUCTION DE TURBULENCE PAR LA FLAMME. DEUX CONFIGURATIONS DE CALCULS SONT CONSIDEREES: UNE FLAMME TURBULENTE ACCROCHEE EN AVAL D'UN OBSTACLE ET UNE FLAMME TURBULENTE STABILISEE PAR UNE MARCHE DESCENDANTE. L'INTERACTION COMBUSTION-TURBULENCE EST MODELISEE AU MOYEN D'UN MODELE DE TYPE BML ASSOCIE AUX EQUATIONS DE BILAN POUR L'ENSEMBLE DES FLUX TURBULENTS. DANS LE CAS DE LA FLAMME STABILISEE EN AVAL DE L'OBSTACLE, ON MONTRE QUE LA DIFFUSION NON-GRADIENT JOUE UN ROLE NEGLIGEABLE. EN REVANCHE, SEUL LE MODELE DU SECOND ORDRE POUR LES TENSIONS DE REYNOLDS PERMET DE PRENDRE EN COMPTE LES PROPRIETES DE L'ECOULEMENT ISOTHERME ET REACTIF. POUR LA FLAMME STABILISEE PAR LA MARCHE DESCENDANTE, LA DIFFUSION TURBULENTE A CONTRE GRADIENT A TRAVERS LE FRONT DE FLAMME ETANT PREPONDERANTE, ON MONTRE QUE SEUL LE MODELE DU SECOND ORDRE POUR LES FLUX TURBULENTS DE MASSE PERMET DE REPRESENTER CE PHENOMENE

Download or read book Fundamentals of Turbulent and Multiphase Combustion written by Kenneth Kuan-yun Kuo and published by John Wiley & Sons. This book was released on 2012-04-24 with total page 914 pages. Available in PDF, EPUB and Kindle. Book excerpt: Detailed coverage of advanced combustion topics from the author of Principles of combustion, Second Edition Turbulence, turbulent combustion, and multiphase reacting flows have become major research topics in recent decades due to their application across diverse fields, including energy, environment, propulsion, transportation, industrial safety, and nanotechnology. Most of the knowledge accumulated from this research has never been published in book form—until now. Fundamentals of Turbulent and Multiphase Combustion presents up-to-date, integrated coverage of the fundamentals of turbulence, combustion, and multiphase phenomena along with useful experimental techniques, including non-intrusive, laser-based measurement techniques, providing a firm background in both contemporary and classical approaches. Beginning with two full chapters on laminar premixed and non-premixed flames, this book takes a multiphase approach, beginning with more common topics and moving on to higher-level applications. In addition, Fundamentals of Turbulent and Multiphase Combustion: Addresses seven basic topical areas in combustion and multiphase flows, including laminar premixed and non-premixed flames, theory of turbulence, turbulent premixed and non-premixed flames, and multiphase flows Covers spray atomization and combustion, solid-propellant combustion, homogeneous propellants, nitramines, reacting boundary-layer flows, single energetic particle combustion, and granular bed combustion Provides experimental setups and results whenever appropriate Supported with a large number of examples and problems as well as a solutions manual, Fundamentals of Turbulent and Multiphase Combustion is an important resource for professional engineers and researchers as well as graduate students in mechanical, chemical, and aerospace engineering.

Download or read book ETUDE EXPERIMENTALE DE LA MODIFICATION DU CHAMP TURBULENT PAR UN FRONT DE FLAMME OBLIQUE written by DANY.. ESCUDIE OLIVE and published by . This book was released on 1981 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: REVUE DES DIFFERENTS MODES DE COMBUSTION. NOTION DE VITESSE DE COMBUSTION TURBULENTE. DIFFERENTES EQUATIONS DE COMBUSTION TURBULENTE. ETUDE EXPERIMENTALE D'UNE FLAMME OBLIQUE DE PREMELANGE AIR-HYDROGENE SE DEVELOPPANT DANS UN ECOULEMENT TURBULENT CONFINE. RESULTATS OBTENUS POUR DES ECOULEMENTS LAMINAIRE ET TURBULENT. EXPLICATION DE L'EVOLUTION LONGITUDINALE ET VERTICALE DES FLUCTUATIONS DE VITESSE EN PRENANT EN COMPTE LES DIFFERENTS TERMES DE L'EQUATION DE L'ENERGIE CINETIQUE DE LA TURBULENCE

Download or read book Direct Numerical Simulation for Turbulent Reacting Flows written by Thierry Baritaud and published by Editions TECHNIP. This book was released on 1996 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contents: Description of accurate boundary conditions for the simulation of reactive flows. Parallel direct numerical simulation of turbulent reactive flow. Flame-wall interaction and heat flux modelling in turbulent channel flow. A numerical study of laminar flame wall interaction with detailed chemistry: wall temperature effects. Modeling and simulation of turbulent flame kernel evolution. Experimental and theoretical analysis of flame surface density modelling for premixed turbulent combustion. Gradient and counter-gradient transport in turbulent premixed flames. Direct numerical simulation of turbulent flames with complex chemical kinetics. Effects of curvature and unsteadiness in diffusion flames. Implications for turbulent diffusion combustion. Numerical simulations of autoignition in turbulent mixing flows. Stabilization processes of diffusion flames. References.

Download or read book Etude exp rimentale de l int raction de fronts de flammes written by Didier Larrauri and published by . This book was released on 1991 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les écoulements réactifs turbulents présents dans de nombreuses applications industrielles (foyers, chambres de combustion de moteur...) Font l'objet de travaux importants, tant sur le plan théorique et numérique qu'expérimental. Il existe un régime de combustion turbulente pour lequel les flammes sont plissées (avec ou sans poches) et la zone de réaction est alors constituée d'un ensemble d'éléments de fronts de flammes, proches les uns des autres, qui conservent les caractéristiques des fronts laminaires. Il s'agit du régime des flammes lettes qui suppose en outre une chimie infiniment rapide. Si dans une telle situation l'interaction combustion/turbulence semble déterminante, une interaction entre les fronts est également concevable. Les expériences réalisées dans le cadre de cette thèse ont pour objectif d'analyser le comportement des fronts de deux flammes obliques de premelange air/hydrogène, stabilisées cote à cote sur des fils de platine, dans une configuration d'interaction simplifiée. Les champs scalaires sont obtenus à l'aide d'un thermocouple et d'une sonde de prélèvement et le champ cinématique par anémométrie doppler laser bicomposante. Cette étude révèle des effets dynamiques importants lies à l'interaction (répulsion des flammes) ainsi que des phénomènes de diffusion de chaleur et d'espèces caractéristiques, mettant en évidence le rôle majeur du nombre de Lewis.

Download or read book Turbulence and Molecular Processes in Combustion written by T. Takeno and published by Elsevier. This book was released on 2012-12-02 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: An understanding of the intricacies in the turbulent combustion process may be a key to solving many of the current energy and environmental problems. The essential nature of turbulent combustion can be derived from the interaction between stochastic flow fluctuations and deterministic molecular processes, such as chemical reaction and transport processes. Undoubtedly, this is one of the most challenging fields of engineering science today, requiring as it does the interaction of scientists and engineers in the respective fields of chemical kinetics and fluid mechanics. The 28 papers in this volume review recent advances in these two disciplines providing new insights into the fundamental processes, addressing a great deal of recent progress. This progress ranges from descriptions of elementary chemical kinetics, to working those descriptions into combustion calculations with large numbers of elementary steps, to improved understanding of turbulent reacting flows and advances in simulations of turbulent combustion. The contributions will inspire further research on many fronts, advancing the understanding of combustion processes, as well as fostering a growing interdisciplinary cooperation.

Download or read book Etude exp rimentale de l interaction combustion turbulence written by Francis Sabathier and published by . This book was released on 1984 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: DANS LES BRULEURS ORIGINAUX ET A L'AIDE DE DIAGNOSTICS NON INTRUSIFS BASES SUR DES TECHNIQUES LASER IL A ETE MIS EN EVIDENCE LES EFFETS HYDRODYNAMIQUES ASSOCIES A LA RETROACTION DU MOUVEMENT DU FRONT DE LA FLAMME SUR L'ECOULEMENT TURBULENT AMONT. CE PHENOMENE SE TRADUIT PAR UNE ATTENUATION SPECTACULAIRE DES BASSES FREQUENCES PRESENTES DANS LE SPECTRE DE LA TURBULENCE DE L'ECOULEMENT EXCITATEUR. AU VOISINAGE DU SEUIL D'INSTABILITE, ON MET EN EVIDENCE L'EMERGENCE D'UN PHENOMENE DE RESONANCE LORSQUE LA TAILLE CARACTERISTIQUE DES TOURBILLONS SE RAPPROCHE DE CELLE DES STRUCTURES CELLULAIRES

Download or read book A Numerical Study of Turbulence combustion Interactions in Diffusion Flame written by H. C. Soong and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Numerical Study of Turbulence flame Interaction in Mild Combustion written by Vincenzo Panebianco and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fundamentals of Premixed Turbulent Combustion written by Andrei Lipatnikov and published by CRC Press. This book was released on 2012-10-24 with total page 551 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lean burning of premixed gases is considered to be a promising combustion technology for future clean and highly efficient gas turbine combustors. Yet researchers face several challenges in dealing with premixed turbulent combustion, from its nonlinear multiscale nature and the impact of local phenomena to the multitude of competing models. Filling a gap in the literature, Fundamentals of Premixed Turbulent Combustion introduces the state of the art of premixed turbulent combustion in an accessible manner for newcomers and experienced researchers alike. To more deeply consider current research issues, the book focuses on the physical mechanisms and phenomenology of premixed flames, with a brief discussion of recent advances in partially premixed turbulent combustion. It begins with a summary of the relevant knowledge needed from disciplines such as thermodynamics, chemical kinetics, molecular transport processes, and fluid dynamics. The book then presents experimental data on the general appearance of premixed turbulent flames and details the physical mechanisms that could affect the flame behavior. It also examines the physical and numerical models for predicting the key features of premixed turbulent combustion. Emphasizing critical analysis, the book compares competing concepts and viewpoints with one another and with the available experimental data, outlining the advantages and disadvantages of each approach. In addition, it discusses recent advances and highlights unresolved issues. Written by a leading expert in the field, this book provides a valuable overview of the physics of premixed turbulent combustion. Combining simplicity and topicality, it helps researchers orient themselves in the contemporary literature and guides them in selecting the best research tools for their work.

Download or read book Turbulence Interaction Effects in Turbulent Premixed Flames written by K. N. C. Bray and published by . This book was released on 1976 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Bray-Moss model for turbulent, premixed combustion is applied to plane, oblique combustion waves. The analysis takes into account the influence of turbulence and inhomogeneity on the effective rate of heat release, and also the competing effects of dilatation and turbulence production due to shear in the turbulence kinetic energy balance. Predictions are made of the flame speed and the structure of the reaction zone in cases where turbulent mixing is rate limiting. Qualitative agreement is found with relevant experimentat data.

Download or read book Turbulent Combustion written by Norbert Peters and published by Cambridge University Press. This book was released on 2000-08-15 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combustion of fossil fuels remains a key technology for the foreseeable future. It is therefore important that we understand the mechanisms of combustion and, in particular, the role of turbulence within this process. Combustion always takes place within a turbulent flow field for two reasons: turbulence increases the mixing process and enhances combustion, but at the same time combustion releases heat which generates flow instability through buoyancy, thus enhancing the transition to turbulence. The four chapters of this book present a thorough introduction to the field of turbulent combustion. After an overview of modeling approaches, the three remaining chapters consider the three distinct cases of premixed, non-premixed, and partially premixed combustion, respectively. This book will be of value to researchers and students of engineering and applied mathematics by demonstrating the current theories of turbulent combustion within a unified presentation of the field.

Download or read book Pr diction num rique des coulements turbulents r actifs written by Bruno Roche and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: La comprehension et la modelisation des phenomenes physiques intervenant dans la combustion turbulente sont primordiaux pour l'etude et l'optimisation des dispositifs industriels tels que les moteurs a allumage commande ou les bruleurs. La complexite du probleme est liee a l'interaction entre les phenomenes thermo-chimiques, caracterisant un front de flamme, et les echelles du spectre continu de la turbulence. Le probleme peut etre simplifie si l'on discretise le spectre de la turbulence en assimilant chaque echelle turbulente a un tourbillon. Les travaux que nous avons realises dans le cadre de cette etude, s'articulent autour de deux axes: la prediction d'une flamme turbulente premelangee et la simulation de l'interaction entre un front de flamme oblique premelangee et une allee tourbillonnaire de von karman. Le premier point est aborde par une simulation de reference en ecoulement laminaire. Puis la flamme oblique turbulente premelangee est etudiee. Deux premelanges, air-hydrogene et air-methane, permettent de traiter le probleme de l'influence du nombre de lewis sur la structure de ces flammes. Dans une deuxieme partie, on s'interesse a l'interaction entre une flamme oblique laminaire de premelange air-hydrogene et une allee tourbillonnaire de von karman. La prediction de cette configuration met en evidence l'influence des tourbillons sur le plissement et l'extinction du front de flamme. Pour chacune de ces etapes, la comparaison entre les predictions numeriques et des donnees experimentales est realisee. Elle nous permet d'analyser les performances des modelisations et elle apporte des informations complementaires sur les phenomenes etudies.