Download or read book Deflagration to detonation Transition and Detonation Propagation in H 2 air Mixtures with Transverse Concentration Gradients written by Lorenz Böck and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deflagration to detonation Transition and Detonation Propagation in H 2 air Mixtures with Transverse Concentration Gradients written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Detonability of H2 air Diluent Mixtures written by Sheldon R. Tieszen and published by . This book was released on 1987 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Transition from Deflagration to Detonation written by Donald Scott Stewart and published by . This book was released on 1981 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Deflagration to Detonation Transition Fueled by Dust Layers written by Yuchen Li and published by . This book was released on 1993 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dynamic Structure of Detonation in Gaseous and Dispersed Media written by A.A. Borissov and published by Springer Science & Business Media. This book was released on 1991-08-31 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: Of late the demands of industry in creating new composite and functional materials with present properties stimulated an increased interest to the investigation of processes which occur in the detonation technologies of complex chemical composition with an additive of disperse particles. The collection includes a series of papers presented at the 3d International Conference "Lavrentyev Readings on Mathematics, Mechanics, and Physics" (Novosibirsk, 1990),was held by the Hydrodynamics Institute under the support of the Presidium of the Siberian Branch of the USSR Academy of Sciences to stimulate the international cooperation of the leading international centers. In the framework of this Conference the Round Table seminar was held by Prof. A. Borissov and Prof. V. Mi trofanov devoted to "Dynamic Structure of Detonation in Gaseous and Dispersed Media". The idea to hold such Round Table was supported by Chairman of Organizing Committee academician Prof. V.Titov from Hydrodynamics Institute, and academician Prof. V. Nakoryakov and also his Institute of Thermophysics. The main ideas discussed at the Round Table were presented in the form of papers which reflected present situation of the problem of dynamic structure of the detonation waves in gaseous and dispersed media. The basic experimental facts concerning of complicated mul ti dimensional non-stationary structure both of the detonation wave and its front surface, generation of the cell structure, the effect of transverse waves, obstacles, channel geometry etc. on the transition from dynamic regime to stationary structure are represented in the fist three papers.
Download or read book The Effect of Lateral Venting on Deflagration to detonation Transition in Hydrogen air stream Mixtures at Various Initial Temperatures written by G. Ciccarelli and published by . This book was released on 1998 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of gas venting on flame acceleration in an obstacle-laden tube has been investigated in the High-Temperature Combustion Facility (HTCF) at BNL. In these venting experiments, the flame was observed to accelerate very quickly in the first tube section before the first vent section. For lean hydrogen mixtures, after the first vent section, the flame velocity decayed to a velocity on the order of the laminar burning velocity. For more sensitive mixtures, the flame reached a quasi-steady flame velocity similar to flame propagation in the choking regime observed in tests without venting. For all initial temperatures, the lean limit for significant flame acceleration (i.e., choking regime limit) with venting increased over the nonventing case by an average of 2 percent hydrogen. In the choking regime, the flame was observed to accelerate in the tube section to a maximum velocity close to the speed of sound in the products and then decelerate across the vent section. At the limited temperatures tested where DDT was observed, the minimum hydrogen concentration required for transition to detonation increased with venting present as compared to without venting. In all cases, after a certain propagation distance, the detonation wave failed due to local venting effects and continued to propagate at a velocity characteristic of the choking regime.
Download or read book Toward Detonation Theory written by Anatoly N. Dremin and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 163 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is known that the Chapman-Jouguet theory of detonation is based on the assumption of an instantaneous and complete transformation of explosives into detonation products in the wave front. Therefore, one should not expect from the theory any interpretations of the detonation limits, such as shock initiation of det onation and kinetic instability and propagation (failure diameter). The Zeldovich-Von Neuman-Doring (ZND) theory of detonation appeared, in fact, as a response to the need for a theory capable of interpreting such limits, and the ZND detonation theory gave qualitative interpretations to the detonation limits. These interpretations were based essentially on the theoretical notion that the mechanism of explosives transformation at detonation is a combustion of a layer of finite thickness of shock-compressed explosive behind the wave shock front with the velocity of the front. However, some experimental findings turned out to be inconsistent with the the ory. A very small change of homogeneous (liquid) explosives detonation velocity with explosive charge diameter near the rather sizable failure diameter is one of the findings. The elucidation of the nature of this finding has led to the discovery of a new phenomenon. This phenomenon has come to be known as the breakdown (BD) of the explosive self-ignition behind the front of shock waves under the effect of rarefaction waves.
Download or read book Dynamic Aspects of Detonations written by A. L. Kuhl and published by AIAA. This book was released on 1993 with total page 516 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Study of Near Limit Propagation of Detonation in Hydrogen Air Mixtures written by S. Yungster and published by . This book was released on 2002 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1989 with total page 892 pages. Available in PDF, EPUB and Kindle. Book excerpt: Papers presented in this publication cover special problems in the field of energetic materials, particularly detonation phenomena in solids and liquids. General subject areas include shock-to-detonation transition, time resolved chemistry, initiation modeling, deflagration-to-detonation transition, equation of state and equation of state and performance, composites and emulsions, and composites and emulsions/underwater explosives, reaction zone, detonation wave propagation, hot spots, detonation products, chemistry and compositions, and special initiation.
Download or read book Formation of Detonation Waves in Hydrogen oxygen Mixtures from 0 2 to 2 Atmospheres Initial Pressure in a 54 meter Long Tube written by Loren E. Bollinger and published by . This book was released on 1964 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Study of Near Limit Propagation of Detonation in Hydrogen Air Mixtures written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computational investigation of the near-limit propagation of detonation in lean and rich hydrogen-air mixtures is presented. The calculations were carried out over an equivalence ratio range of 0.4 to 5.0, pressures ranging from 0.2 bar to 1.0 bar and ambient initial temperature. The computations involved solution of the one-dimensional Euler equations with detailed finite-rate chemistry. The numerical method is based on a second-order spatially accurate total-variation-diminishing (TVD) scheme, and a point implicit, first-order-accurate, time marching algorithm. The hydrogen-air combustion was modeled with a 9-species, 19-step reaction mechanism. A multi-level, dynamically adaptive grid was utilized in order to resolve the structure of the detonation. The results of the computations indicate that when hydrogen concentrations are reduced below certain levels, the detonation wave switches from a high-frequency, low amplitude oscillation mode to a low frequency mode exhibiting large fluctuations in the detonation wave speed; that is, a 'galloping' propagation mode is established. Yungster, S. and Radhakrishnan, K. Glenn Research Center NASA/CR-2002-211889, NAS 1.26:211889, E-13571, ICOMP-2002-06, AIAA Paper 2002-3712
Download or read book Transition to Detonation in Fuel air Explosive Clouds written by and published by . This book was released on 1993 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: The introduction to this paper shows experimental evidence that transition to detonation phenomena, similar to those identified in fuel/oxygen mixtures, can also occur in fuel/air mixtures. Such phenomena include the deflagration to detonation transition (DDT), where the critical conditions for the onset of detonation are established by the combustion process itself without an external high-energy source. The paper briefly reviews general aspects of the events leading to explosions and then describes some of the new research developments which impact on the DDT problem. In particular, theoretical & experimental results on the nature, behaviour, and initiation of gaseous detonations are reviewed. Observations of transition to detonation in fuel/air mixtures are also summarized, and the influence of mixture composition, experimental configuration, and scale on flame acceleration & transition phenomena are discussed. Some proposed models for transition to detonation are also reviewed, and proposals are made for future research to obtain a better understanding of DDT phenomena.
Download or read book The Detonation Phenomenon written by John H. S. Lee and published by Cambridge University Press. This book was released on 2008-06-30 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book introduces the detonation phenomenon in explosives. It is ideal for engineers and graduate students with a background in thermodynamics and fluid mechanics. The material is mostly qualitative, aiming to illustrate the physical aspects of the phenomenon. Classical idealized theories of detonation waves are presented first. These permit detonation speed, gas properties ahead of and behind the detonation wave, and the distribution of fluid properties within the detonation wave itself to be determined. Subsequent chapters describe in detail the real unstable structure of a detonation wave. One-, two-, and three-dimensional computer simulations are presented along with experimental results using various experimental techniques. The important effects of confinement and boundary conditions and their influence on the propagation of a detonation are also discussed. The final chapters cover the various ways detonation waves can be formed and provide a review of the outstanding problems and future directions in detonation research.
Download or read book Deflagration to Detonation Transition Experiments with Hydrogen air Mixtures in Shock Tube and Obstacle Array Geometries written by and published by . This book was released on 1999 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Detonation and Two Phase Flow written by S Penner and published by Elsevier. This book was released on 2012-12-02 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in Astronautics and Rocketry, Volume 6: Detonation and Two-Phase Flow compiles technical papers presented at the ARS Propellants, Combustion, and Liquid Rockets Conference held in Palm Beach, Florida on April 26-28, 1961. This book provides an excellent illustration of research and development on a selected group of problems relating to detonations, two-phase nozzle flow, and combustion in liquid fuel rocket engines. This volume is divided into two parts. Part 1 covers the entire range of physical conditions under which detonation may be initiated or sustained, such as high explosives, solid propellants, liquid sprays, and gases. Experimental and theoretical studies are also discussed, including the significant progress of the basic phenomena involved in transition from deflagration to detonation, and nature of stable detonations in dilute sprays and other systems. The perennial problems associated with high frequency instabilities in liquid fuel rocket engines are considered in Part 2. This publication is valuable to students and investigators working in the field of propulsion research and development.
