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Book Description
SONT EXAMINEES LES CONDITIONS D'INITIATION DE LA DETONATION CYLINDRIQUE DES MELANGES A BASE DE METHANE. L'APPORT D'ENERGIE D'INITIATION PAR FIL EXPLOSIF EST VARIABLE, QUANTIFIE ET DEPOSE SOIT AU CENTRE SOIT A UN ANGLE DE LA CHAMBRE D'EPAISSEUR VARIABLE. LA PROPAGATION DES ONDES DE CHOC ET DE COMBUSTION EST CARACTERISEE A L'AIDE DE CAPTEUR DE PRESSION, DE SONDES D'IONISATION, DE LA TECHNIQUE DES TRACES. LES PARAMETRES DE L'ETUDE SONT LA RICHESSE DU MELANGE METHANE-OXYGENE, LA TENEUR EN INERTE (AZOTE), LA PRESSION INITIALE, L'EPAISSEUR DE LA BOMBE ET L'ADDITION DE PROPANE. L'INITIATION DIRECTE DE LA DETONATION N'A JAMAIS ETE OBSERVEE ; PAR CONTRE DEUX MODES DE TRANSITION DEFLAGRATION-DETONATION SONT MIS EN EVIDENCE SELON LE LIEU D'APPORT D'ENERGIE. UN RAYON MAXIMUM EST OBSERVE. LA STRUCTURE CELLULAIRE EST CLAIREMENT EXPLOITEE. LES DIFFERENTS PARAMETRES DYNAMIQUES DE LA DETONATION SONT CORRELES ENTRE-EUX PERMETTANT UNE ETUDE COMPARATIVE APPROFONDIE DES ENERGIES CRITIQUES CORRELANT CELLES PLANE, CYLINDRIQUE ET SPHERIQUE
Book Description
SONT EXAMINEES LES CONDITIONS D'INITIATION DE LA DETONATION CYLINDRIQUE DES MELANGES A BASE DE METHANE. L'APPORT D'ENERGIE D'INITIATION PAR FIL EXPLOSIF EST VARIABLE, QUANTIFIE ET DEPOSE SOIT AU CENTRE SOIT A UN ANGLE DE LA CHAMBRE D'EPAISSEUR VARIABLE. LA PROPAGATION DES ONDES DE CHOC ET DE COMBUSTION EST CARACTERISEE A L'AIDE DE CAPTEUR DE PRESSION, DE SONDES D'IONISATION, DE LA TECHNIQUE DES TRACES. LES PARAMETRES DE L'ETUDE SONT LA RICHESSE DU MELANGE METHANE-OXYGENE, LA TENEUR EN INERTE (AZOTE), LA PRESSION INITIALE, L'EPAISSEUR DE LA BOMBE ET L'ADDITION DE PROPANE. L'INITIATION DIRECTE DE LA DETONATION N'A JAMAIS ETE OBSERVEE ; PAR CONTRE DEUX MODES DE TRANSITION DEFLAGRATION-DETONATION SONT MIS EN EVIDENCE SELON LE LIEU D'APPORT D'ENERGIE. UN RAYON MAXIMUM EST OBSERVE. LA STRUCTURE CELLULAIRE EST CLAIREMENT EXPLOITEE. LES DIFFERENTS PARAMETRES DYNAMIQUES DE LA DETONATION SONT CORRELES ENTRE-EUX PERMETTANT UNE ETUDE COMPARATIVE APPROFONDIE DES ENERGIES CRITIQUES CORRELANT CELLES PLANE, CYLINDRIQUE ET SPHERIQUE
Author: M.A. Nettleton Publisher: Springer Science & Business Media ISBN: 9400931492 Category : Medical Languages : en Pages : 266
Book Description
My introduction to the fascinating phenomena associated with detonation waves came through appointments as an external fellow at the Department of Physics, University College of Wales, and at the Department of Mechanical Engineering, University of Leeds. Very special thanks for his accurate guidance through the large body of information on gaseous detonations are due to Professor D. H. Edwards of University College of Wales. Indeed, the onerous task of concisely enumerating the key features of unidimensional theories of detonations was undertaken by him, and Chapter 2 is based on his initial draft. When the text strays to the use of we, it is a deserved acknow ledgement of his contribution. Again, I should like to thank Professor D. Bradley of Leeds University for his enthusiastic encouragement of my efforts at developing a model of the composition limits of detonability through a relationship between run-up distance and composition of the mixture. The text has been prepared in the context of these fellowships, and I am grateful to the Central Electricity Generating Board for its permission to accept these appointments.
Author: Kazuyoshi Takayama Publisher: Springer Science & Business Media ISBN: 3642468764 Category : Science Languages : en Pages : 337
Book Description
Ram accelerators are among the most advanced tools for generating fluid dynamcis data in supersonic reacting systems. They require the combined action of combustion, wave systems and turbulence and are still a serious challenge for physicists and engineers. This book will serve as an introductionary textbook on ram accelerators and gives a thorough overview on research activities, performance modeling and high-pressure detonation dynamics.
Author: A. K. Oppenheim Publisher: Elsevier ISBN: 1483150054 Category : Science Languages : en Pages : 787
Book Description
Gas Dynamics of Explosions and Reactive Systems documents the proceedings of the 6th Colloquium held at the Royal Institute of Technology in Stockholm, Sweden, 22-26 August 1977. The meeting was held under the auspices of the Royal Swedish Academy of Sciences and the International Academy of Astronautics. The scientific program included over one hundred papers. The contributions in this volume are organized into four parts. Part I contains papers on gaseous detonations. It covers topics such as theoretical model of a detonation cell; spherical detonations in hydrocarbon-air mixtures; and shock wave propagation in tubes filled with water foams. Part II presents studies on explosions, such as the detonation of hydrogen azide and propagation of a laser-supported detonation wave. Part III examines condensed phase detonations. It includes papers on the mechanism of the divergent and convergent dark waves originating at the charge boundary in detonating liquid homogeneous explosives with unstable detonation front; and initiation studies in sensitized nitromethane. Part IV presents discussions on turbulent detonations, covering topics such as the computational aspects of turbulent combustion and problems and techniques in turbulent reactive systems.
Author: Emmanuel Kwasi Addai Publisher: Western Engineering, Inc. ISBN: 0991378229 Category : Science Languages : en Pages : 265
Book Description
Explosion hazards involving mixtures of different states of aggregation continue to occur in facilities where dusts, gases or solvents are handled or processed. In order to prevent or mitigate the risk associated with these mixtures, more knowledge of the explosion behavior of hybrid mixtures is required. The aim of this study is to undertake an extensive investigation on the explosion phenomenon of hybrid mixtures to obtain insight into the driving mechanisms and the explosion features affecting the course of hybrid mixture explosions. This was accomplished by performing an extensive experimental and theoretical investigation on the various explosion parameters such as: minimum ignition temperature, minimum ignition energy, limiting oxygen concentration, lower explosion limits and explosion severity. Mixtures of twenty combustible dusts ranging from food substances, metals, plastics, natural products, fuels and artificial materials; three gases; and six solvents were used to carry out this study. Three different standard equipments: the 20-liter sphere (for testing lower explosion limits, limiting oxygen concentration and explosion severity), the modified Hartmann apparatus (for testing minimum ignition energy) and the modified Godbert–Greenwald (GG) furnace (for testing minimum ignition temperature) were used. The test protocols were in accordance with the European standard procedures for dust testing for each parameter. However, modifications were made on each equipment in order to test the explosion properties of gases, solvents, and hybrid mixtures. The experimental results demonstrated a significant decrease of the minimum ignition temperature, minimum ignition energy and limiting oxygen concentration of gas or solvent and increase in the likelihood of explosion when a small amount of dust, which was either below the minimum explosion concentration or not ignitable by itself, was mixed with gas or solvent and vice versa. For example, methane with minimum ignition temperature of 600 °C decreased to 530 °C when 30 g/m3 of toner dust, which is 50 % below its minimum explosible concentration was, added. A similar explosion behavior was observed for minimum ignition energy and limiting oxygen concentration. Furthermore, it was generally observed that the addition of a non-explosible concentration of flammable gas or spray to a dust-air mixture increases the maximum explosion pressure to some extent and significantly increases the maximum rate of pressure rise of the dust mixture, even though the added concentrations of gases or vapor are below its lower explosion limit. Finally, it could be said that, one cannot rely on the explosion properties of a single substance to ensure full protection of an equipment or a process if substances with different states of aggregate are present.
Author: George H. Markstein Publisher: Elsevier ISBN: 1483221628 Category : Science Languages : en Pages : 339
Book Description
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.
Author: Peter O. K. Krehl Publisher: Springer Science & Business Media ISBN: 3540304215 Category : Science Languages : en Pages : 1298
Book Description
This unique and encyclopedic reference work describes the evolution of the physics of modern shock wave and detonation from the earlier and classical percussion. The history of this complex process is first reviewed in a general survey. Subsequently, the subject is treated in more detail and the book is richly illustrated in the form of a picture gallery. This book is ideal for everyone professionally interested in shock wave phenomena.
Author: Miloud Aminallah
Author: Miloud Aminallah
Author: 
Author: M.A. Nettleton
Author: Kazuyoshi Takayama
Author: A. K. Oppenheim
Author: A. L. Kuhl
Author: Emmanuel Kwasi Addai
Author: 
Author: George H. Markstein
Author: Peter O. K. Krehl