Download or read book Some Properties of Detonation Waves in Dense Stellar Material written by Adrian Marroquin and published by . This book was released on 1973 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Properties of Detonation Waves written by Jon Tegnér and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "A detonation wave is a combined compression and combustion wave which travels with supersonic speed through a mixture of fuel and oxidizer. The numerical computation of detonation waves is complicated by two important features of the process. First, the solution has sharp gradients and second, the source term can be very large. Strange behavior of the numerical solutions has been reported, for instance waves traveling with the unphysical speed of one cell per time step. This thesis investigates the sensitivity of detonation waves to the diffusive and dissipative mechanisms present. An important dimensionless number in this context is Kr = [mu]K/Q[rho]1. Here [mu] is the viscosity, K is the rate of reaction, Q is the heat release available in the process and [rho]1 is the density in the unburnt state. It is shown that the density peak of the traveling wave depends on Kr and also, that if Kr is sufficiently large, there is no traveling wave solution. The analysis is performed on model problems which are successive simplifications of the full set of conservation laws for mass, momentum, energy and species. Since most numerical methods used for problems with sharp gradients involve extra dissipation (artificial viscosity) they can not uncritically be applied to the computation of detonation waves. The analysis shows that the extra dissipation will not only smear out the sharp gradients (as in ordinary shock wave problems) but also change the character of the solution, typically the speed of the detonation wave and the extreme values obtained. Some remedies are suggested. If extra dissipation is involved in the numerical method it may be necessary to modify the source term, both its size and its dependence on the temperature, in order to retain the correct character of the solution. Typically, if an artificial [mu] is used then the rate of reaction, K, should be modified so that Kr is kept constant."
Download or read book Properties of Oblique Detonation Waves written by Wallace Chinitz and published by . This book was released on 1959 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 THE INFLUENCE OF HIGH PRESSURE ON THE PROPERTIES OF HYDROGEN OXYGEN DETONATION WAVES written by Roy L. Gealer and published by . This book was released on 1958 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Properties of Detonation Waves Without Heat Conduction written by Jon Tegnér and published by . This book was released on 1992 with total page 29 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "The phenomena of unphysical wave propagation speeds sometimes occur in numerical computations of detonation waves on coarse grids. The strong detonation wave splits into two parts, a weak detonation which travels with the speed of one cell per time step and an ordinary shock wave. We analyze a simplified set of equations mathematically and look for traveling wave solutions. It is shown that the solution depends heavily on the dimensionless number Kr = [mu]K/QP1 where [mu] is the viscosity, K is the reaction rate, Q is the heat release available in the process, and P1 is the density at the unburnt state. The erroneous behavior above is explained as an effect of the increased artificial viscosity inherent in the numerical methods when coarse grids are used. To prevent the unphysical behavior we suggest the use of an 'artificial reaction rate' when artificial viscosity is inherent such that Kr retains its correct physical value."
Download or read book Theoretical Investigations of the Properties of Oblique Detonation Waves written by Philip F. Gibber and published by . This book was released on 1962 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: One method of solving the problem of burning or combustion at supersonic speed is by combusting in a stationary detonation wave. Stabilization of a detonation wave has been recently accomplished and is reproducible, but only in laboratory type apparatus. Using two-dimensional steady flow, perfect gas theory, this paper provides solutions for the changes in properties that may be expected across any oblique detonation wave. Equations are established and solved using the Control Data Corporation 1604 digital computer of the U.S. Naval Postgraduate School, Monterey, California, for different values of specific heat ratio, initial Mach number, a function of the flow deflection angle, and the amount of heat added in the detonation. The results appear in tabular form and for several specific values of Mach number and heat addition in graphical form. An example of use of the data is shown with reference to a ramjet engine operating with a stationary detonation wave for the combustion process.
Download or read book Theoretical Investigations of the Properties of Oblique Detonation Waves Appendices G H and i written by Philip F. Gibber and published by . This book was released on 1962 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulation of Air Shocks with Detonation Waves written by Gerald P. D'Arcy and published by . This book was released on 1966 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented theoretically and experimentally are (1) the feasibility of simulating a nuclear blast environment by detonating a gas and (2) determination of the initial conditions of hydrogen-oxygen mixtures to yield blast waves of the same pressure-velocity relationship as that in air shock waves. When the theory was derived by predicting the characteristics of the simulated blast waves, a computer program was written. Experimental data were used to adjust the computed data. The experiments were conducted in a 13-inch-diameter, high-pressure shock tube and yielded four mixtures of hydrogen and oxygen capable of simulating shock waves with overpressures of from 300 to 1,200 psi. It was found that detonation waves may be substituted for air shock waves when the incident loading is important and that applications are generally limited to instances in which only one characteristic of an air shock is simulated. (Author)
Download or read book Blast Effects written by Isabelle Sochet and published by Springer. This book was released on 2017-12-22 with total page 199 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book compiles a variety of experimental data on blast waves. The book begins with an introductory chapter and proceeds to the topic of blast wave phenomenology, with a discussion on Rankine-Hugoniot equations and the Friedlander equation, used to describe the pressure-time history of a blast wave. Additional topics include arrival time measurement, the initiation of detonation by exploding wires, a discussion of TNT equivalency, and small scale experiments. Gaseous and high explosive detonations are covered as well. The topics and experiments covered were chosen based on the comparison of used scale sizes, from small to large. Each characteristic parameter of blast waves is analyzed and expressed versus scaled distance in terms of energy and mass. Finally, the appendix compiles a number of polynomial laws that will prove indispensable for engineers and researchers.
Download or read book Shock Wave Phenomena and the Properties of Condensed Matter written by Gennady I. Kanel and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the main goals of investigations of shock-wave phenomena in condensed matter is to develop methods for predicting effects of explosions, high-velocity collisions, and other kinds of intense dynamic loading of materials and structures. Based on the results of international research conducted over the past 30 years, this book is addressed not only to experts in shock-wave physics, but also to interested representatives from adjacent fields of activity and to students who seek an introduction to the current issues.
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.
Download or read book Shock and Detonation Waves written by John G. Kirkwood and published by Taylor & Francis Group. This book was released on 1968 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Some Diagrams of the Flow Properties Behind Oblique Detonation Waves written by J. Weber and published by . This book was released on 1963 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Shock Waves written by Gabi Ben-Dor and published by Academic Press. This book was released on 2001-01-01 with total page 792 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Detonation written by Wildon Fickett and published by Courier Corporation. This book was released on 2012-08-29 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comprehensive review of detonation explores the "simple theory" and experimental tests of the theory; flow in a reactive medium; steady detonation; the nonsteady solution; and the structure of the detonation front. 1979 edition.
Download or read book NASA Glenn Coefficients for Calculating Thermodynamic Properties of Individual Species written by Bonnie J. McBride and published by . This book was released on 2002 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:
