Download or read book New Directions in Multiphase Flow Interior Ballistic Modeling written by Albert W. Horst and published by . This book was released on 1990 with total page 61 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past two decades, several two-phase-flow interior ballistic codes have been developed. Generally, they have treated ignition-induced pressure waves as a hydrodynamic problem which arises from the ignition stimulus, the propellant geometry, the path of flamespreading in the propellant bed, and the interaction of charge and chamber. Ignition and combustion have been treated as a simple process, with convectively-driven inert heating of the propellant until a surface-temperature criterion is reached, at which time an aP superscript n burning law describes the propellant surface regression, and all of the energy contained in the burned propellant is released immediately. The effects of propellant grain fracture, caused either by grain stress due to propellant bed compaction or by impact with fixed boundaries, has been outside the scope of the several codes. While the codes have incorporated interphase heat transfer and drag, they have been called inviscid, as the conservation laws are formulated to neglect the efforts of viscosity and heat conduction in the gas phase. This report describes, for the NOVA family of codes, (a) the recent inclusion of finite-rate chemistry and grain fracture, (b) planned efforts to improve the propellant near-field combustion model further, and (c) ongoing efforts to formulate a viscid/inviscid model to permit a linkage of effects with widely differing scales of heterogeneity. Keywords: Interior ballistics; Modeling; Kinetics; Viscosity. (jhd).
Download or read book 11th International Symposium on Ballistics Propulsion dynamics launch dynamics flight dynamics written by and published by . This book was released on 1989 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 30th AIAA ASME SAE ASEE Joint Propulsion Conference written by and published by . This book was released on 1994 with total page 590 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ballistics written by and published by . This book was released on 1986 with total page 656 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gun Muzzle Blast and Flash written by Günter Klingenberg and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1992 with total page 598 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents, for the first time, a comprehensive and up-to-date treatment of gun muzzle blast and flash. It describes the gas dynamics involved, modern propulsion systems, flow development, chemical kinetics, and reaction networks of flash suppression additives as well as historical work. In addition, the text presents data to support a revolutionary viewpoint of secondary flash ignition and suppression. The book is written for practitioners and novices in the flash suppression field: engineers, scientists, researchers, ballisticians, propellant designers, and those involved in signature detection or suppression.
Download or read book Two Phase Viscous Flow Modeling of Interior Ballistics Algorithm and Numerical Predictions for an Idealized Lagrange Gun written by and published by . This book was released on 1983 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: A new state of the art algorithm, ALPHA, for the simulation of the multi- phase, multidimensional, unsteady, compressible, viscous, non-reactive, interior ballistics flow in a gun tube behind an accelerating projectile is described. The paper contains discussions of the physical processes in a real gun environment, of the mathematical model of these phenomena, and of the numerical technique for solving the equations. The algorithm allows the inclusion of several submodels, such as, heat transfer and turbulence. This permits the determination of the effects of these submodels on the flow. Numerical results of an idealized, one-phase ballistic cycle are given. Some of the significant results include the existence of a concentrated region of high temperature near the juncture of the projectile base and tube wall, the increase of the displacement thickness by a factor of at least three over most of the tube's length when turbulence effects are included, and the degradation of the projectile velocity by approximately ten percent under an isothermal cold wall condition.
Download or read book Introduction to Multiphase Flow written by George Yadigaroglu and published by Springer. This book was released on 2017-08-19 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the maiden volume in a new series devoted to lectures delivered through the annual seminars “Short Courses on Multiphase Flow,” held primarily at ETH Zurich continuously since 1984. The Zurich short courses, presented by prominent specialists in the various topics covered, have attracted a very large number of participants. This series presents fully updated and when necessary re-grouped lectures in a number of topical volumes. The collection aims at giving a condensed, critical and up-to-date view of basic knowledge on multiphase flows in relation to systems and phenomena encountered in industrial applications. The present volume covers the background of Multiphase Flows (MPF) that introduces the reader to the particular nature and complexity of multiphase flows and to basic but critical aspects of MPFs including concepts and the definition of the quantities of interest, an introduction to modelling strategies for MPFs, flow regimes, flow regime maps and tr ansition criteria. It also deals with the ubiquitous needs of the multiphase-flow modeller, namely pressure drop and phase distribution, i.e., the void fraction and the topology of the phases that determines the flow regimes.
Download or read book Interior Ballistics Modeling Extensions to the One Dimensional XKTC Code and Analytical Studies of Pressure Gradient for Lumped Parameter Codes written by and published by . This book was released on 2001 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe a number of extensions to the XNOVAKTC (XKTC) Code, a model of interior ballistic phenomena based on a numerical solution of the governing equations for one-dimensional, multi-phase flow. We also present some analytical formulations for the pressure gradient in a gun in a form suitable for incorporation into a lumped parameter interior ballistics model. In XKTC, the flow resistance formula for stacked granular propellant is extended to account for the increase in drag due to tumbling of the grains as the bed expands. The code is also extended to permit the analysis of the consequences of propellant fracture, with fracture taken to be dependent on the local maximum intergranular stress. An explicit representation of the impact induced granular compaction wave as a surface of discontinuity is encoded to support the fracture analysis. The analytical formulas for the pressure gradient include the effects of tube geometry and several aspects of the structure of the two-phase flow. The results are in a closed form with the breech and base pressure explicitly related to the spacemean pressure. Results are presented for both granular and stick propelling charges.
Download or read book Modeling Multiphase Materials Processes written by Manabu Iguchi and published by Springer Science & Business Media. This book was released on 2010-11-10 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling Multiphase Materials Processes: Gas-Liquid Systems describes the methodology and application of physical and mathematical modeling to multi-phase flow phenomena in materials processing. The book focuses on systems involving gas-liquid interaction, the most prevalent in current metallurgical processes. The performance characteristics of these processes are largely dependent on transport phenomena. This volume covers the inherent characteristics that complicate the modeling of transport phenomena in such systems, including complex multiphase structure, intense turbulence, opacity of fluid, high temperature, coupled heat and mass transfer, chemical reactions in some cases, and poor wettability of the reactor walls. Also discussed are: solutions based on experimental and numerical modeling of bubbling jet systems, recent advances in the modeling of nanoscale multi-phase phenomena and multiphase flows in micro-scale and nano-scale channels and reactors. Modeling Multiphase Materials Processes: Gas-Liquid Systems will prove a valuable reference for researchers and engineers working in mathematical modeling and materials processing.
Download or read book New Pressure Gradient Equations for Lumped parameter Interior Ballistic Codes written by Frederick W. Robbins and published by . This book was released on 1990 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Charge Designer s Workbench A Range of Interior Ballistic Modeling Tools written by and published by . This book was released on 2006 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gun and ammunition designers typically employ various models initially to evaluate preliminary design concepts and ultimately to make specific decisions regarding the design and optimization of both individual components and all-up weapon systems. A wide range of computerized models exists today to address virtually every aspect of this process; in particular, the propelling charge designer has available several levels of interior ballistic models. These range from rather simple lumped-parameter models, providing basic performance data such as muzzle velocity and peak pressure and which run quickly on personal computers, to very complex multidimensional, multiphase flow models capable of describing the details of flamespreading, grain motion, and the formation of pressure waves, but employ specialized and occasionally unavailable input for propellant, charge, and gun parameters and require many hours on a workstation or supercomputer to complete the simulation. This report addresses the increasing level of physics and thus range of applicability to problems of increasing sophistication associated with three of today's most popular interior ballistic models: the lumped-parameter IBHVG2 code, the one-dimensional, two-phase flow XKTC code, and the state-of-the-art multidimensional, multiphase flow NGEN3 code. Recommendations are made with respect to the appropriate use of each of these highly useful tools, as well as the transferability of input data and comparability of results so obtained.
Download or read book New Directions in Computational Interior Ballistics written by Gloria P. Wren and published by . This book was released on 1995 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Methods in Multiphase Flow IV written by A.A. Mammoli and published by WIT Press. This book was released on 2007-05-11 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fluid Dynamics is one of the most important topics of applied mathematics and physics. Together with complex flows and turbulence, multiphase flows remains one of the most challenging areas of computational mechanics, and even seemingly simple problems remain unsolved to date. Multiphase flows are found in all areas of technology, at all length scales and flow regimes. The fluids involved can be compressible or incompressible, linear or nonlinear. Because of the complexity of the problem, it is often essential to utilize advanced computational and experimental methods to solve the complex equations that describe them. Challenges in these simulations include nonlinear fluids, treating drop breakup and coalescence, characterizing phase structures, and many others.This volume brings together work presented at the Fourth International Conference on Computational and Experimental Methods in Multiphase and Complex Flows. Featured topics include: Suspensions; Bubble and Drop Dynamics; Flow in Porous Media; Interfaces; Turbulent Flow; Injectors and Nozzles; Particle Image Velocimetry; Macroscale Constitutive Models; Large Eddy Simulation; Finite Volumes; Interface Tracking Methods; Biological Flows; Environmental Multiphase Flow; Phase Changes and Stochastic Modelling.
Download or read book Multiphase Flow Dynamics written by Marcio Ferreira Martins and published by Springer Nature. This book was released on 2022-04-01 with total page 342 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents isothermal and non-isothermal multiphase flows with and without phase change or chemical reactions. Six main axes of multiphase flow are covered in a strategic order: Multiphase Flow in Industry, Multiphase Flow Measurement and Instrumentation, Multiphase Flow With Phase Change & Chemical Reactions, Multiphase Flow Modeling, Experimental Multiphase Flow, and Wet and Dry Particulate Systems. Each part is opened by mini-reviews written by internationally prominent researchers from the academy and industry. The content is of interest to researchers and engineers working in mining, oil and gas, power, nuclear, chemical process, space, food, biomedical, micro and nanotechnology, and other industries.
Download or read book Bubbly Flows written by Martin Sommerfeld and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book summarises the outcom of a priority research programme: 'Analysis, Modelling and Computation of Multiphase Flows'. The results of 24 individual research projects are presented. The main objective of the research programme was to provide a better understanding of the physical basis for multiphase gas-liquid flows as they are found in numerous chemical and biochemical reactors. The research comprises steady and unsteady multiphase flows in three frequently found reactor configurations, namely bubble columns without interiors, airlift loop reactors, and aerated stirred vessels. For this purpose new and improved measurement techniques were developed. From the resulting knowledge and data, new and refined models for describing the underlying physical processes were developed, which were used for the establishment and improvement of analytic as well as numerical methods for predicting multiphase reactors. Thereby, the development, lay-out and scale-up of such processes should be possible on a more reliable basis.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1990 with total page 1266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1990 with total page 1312 pages. Available in PDF, EPUB and Kindle. Book excerpt:
