Download or read book The Ignition of Solid Propellants by Radiative Convective and Chemical Heating written by Sami Atallah and published by . This book was released on 1969 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report presents the results of an experimental study in which aluminized and non-aluminized composite solid propellants were ignited under different environmental conditions. Ignition was achieved by radiative, convective and chemical heating. An optical system operating in two narrow wavelength bands was used to detect the onset of ignition on and near the surface of the propellant. It was found that ignition delay time was dependent on the wavelength used for detection, the method of heating, and other environmental factors. The implications of these results are discussed in relation to existing ignition theories, and recommendations are made for further study. (Author).
Download or read book Ignition Response of Solid Propellants to Radiation and Conduction written by S. Henry Inami and published by . This book was released on 1968 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental measurements were carried out on the ignition response of solid propellants to radiative and to conductive heat transfer. The propellants were composed of ammonium perchlorate and different organic binders. The experimental results were interpreted in terms of a model involving exothermic chemical reaction in the condensed phase of the propellant. The heat release rates in the surface-coupled reactions were measured independently. Such a model adequately fitted the ignition process associated with a thermal runaway in the condensed phase. A comparison of the ignition data demonstrated different response of the propellants to the mode of ignition. The importance of these results to rocket motor tests is discussed. (Author).
Download or read book Solid Propellant Rocket Research written by Martin Summerfield and published by Elsevier. This book was released on 2013-11-11 with total page 713 pages. Available in PDF, EPUB and Kindle. Book excerpt: Solid Propellant Rocket Research
Download or read book Ignition and Combustion of Solid Propellants written by Alva D. Baer and published by . This book was released on 1968 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results are presented from a study of the ignition response of composite propellants to convective heat fluxes from high and low temperature gases. For gas temperatures below about 750C, the convective ignition data were in excellent agreement with results from thermal radiation tests. At higher convective gas temperatures, the ignition times were uniformly about 0.8 of the radiation and low-gas-temperature ignition times. It is postulated that feedback of energy or reactive species occurs from the hot gas in the thin convective boundary layers for the high temperature gas. Tests in which blackened composite propellant samples were ignited by radiant energy fluxes, ambient atmosphere being room-temperature air or air at 800-1350C, indicated no effect of the gas temperature on the time to first-flame. (Author).
Download or read book Nonsteady Burning and Combustion Stability of Solid Propellants written by Luigi De Luca and published by AIAA (American Institute of Aeronautics & Astronautics). This book was released on 1992 with total page 924 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Critical Analysis of Arc Image Ignition of Solid Propellants written by M. Summerfield and published by . This book was released on 1967 with total page 45 pages. Available in PDF, EPUB and Kindle. Book excerpt: The arc image furnace is used widely for evaluating solid propellant ignition characteristics, but the applicability of such data to rocket motors is questionable. In arc image testing, radiation replaces the normal conductive and convective heating modes that exist in rocket motor ignition; radiation interacts with the propellant in a basically different way. Thus, for example, because radiation is absorbed in depth, the ignition delay is sensitive to propellant opacity. In addition, radiation can cause subsurface disruption of the propellant. A physical model is proposed in which incident radiation penetrates the propellant and is absorbed, causing thermal and photochemical decomposition and a temperature increase. Oxidative reactions start either in the gaseous boundary layer or on the surface and, by thermochemical action, lead to a flame. The system of differential equations for this complete model is complicated and has not been solved. However, an equivalent model of simpler character is solved, and an equation is produced for the ignition time delay as a function of radiation intensity, pressure, and physico-chemical properties. The qualitative behavior of experimental radiative ignition data reported by Beyer and Fishman and by Bastress is explained by this theory. (Author).
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Propellants and Explosives written by Naminosuke Kubota and published by John Wiley & Sons. This book was released on 2015-04-23 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This third edition of the classic on the thermochemical aspects of the combustion of propellants and explosives is completely revised and updated and now includes a section on green propellants and offers an up-to-date view of the thermochemical aspects of combustion and corresponding applications. Clearly structured, the first half of the book presents an introduction to pyrodynamics, describing fundamental aspects of the combustion of energetic materials, while the second part highlights applications of energetic materials, such as propellants, explosives and pyrolants, with a focus on the phenomena occurring in rocket motors. Finally, an appendix gives a brief overview of the fundamentals of aerodynamics and heat transfer, which is a prerequisite for the study of pyrodynamics. A detailed reference for readers interested in rocketry or explosives technology.
Download or read book Ignition of Solids written by Vladimir Nikiforovich Vili︠u︡nov and published by Elsevier Publishing Company. This book was released on 1989 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ignition of condensed substances is a recent scientific trend in combustion and explosion physics. Its principal results have been obtained largely by using computers and modern experimental techniques. In this book the authors present a comprehensive theoretical examination of various ignition models and the elaboration of experimental approaches for their description. The first three chapters were originally published in 1984 in Russian (V.N. Vilyunov, Ignition Theory of Condensed Substance, Nauka, Novosibirsk). For this English edition they have been revised and supplemented by new material. Two completely new chapters have also been added: one devoted to experimental studies and the other to local ignition problems. The book is the result of several years of active experience in the field of ignition. It will be of particular interest to research workers in chemical physics and to engineers dealing with the problems of fire-explosion accident prevention.
Download or read book Fundamentals of Solid Propellant Combustion written by K. K. Kuo and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book OAR written by and published by . This book was released on 1967 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Air Force Research Resum s written by and published by . This book was released on with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Surface temperature Measurements of Solid Propellants During Ignition written by John A. Keller and published by . This book was released on 1967 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface temperatures were measured on ammonium perchlorate propellants during ignition by convective heating by use of an infrared radiation sensor. This study was conducted in a shocktube apparatus, and air or nitrogen was used for heating the propellant samples. Heat fluxes were in the range of 30 to 80 cal/sq cm/sec. Surface temperature histories measured on propellant samples with smooth blackened surfaces are in good agreement with predictions of a thermal ignition model that considers the key ignition reaction to be localized at the propellant surface. Surface roughness effects and sample transparency to thermal radiation result in difficulties in relating the infrared detector output to surface temperature. (Author).
Download or read book U S Government Research Development Reports written by and published by . This book was released on 1970 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fast Reactions in Energetic Materials written by Alexander S. Shteinberg and published by Springer Science & Business Media. This book was released on 2008-09-26 with total page 203 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modern energetic materials include explosives, blasting powders, pyrotechnic m- tures and rocket propellants [1, 2]. The study of high-temperature decomposition of condensed phases of propellants and their components (liquid, solid and hybrid) is currently of special importance for the development of space-system engineering [3, 4]. To better understand the burning mechanisms (stationary, nonstationary, - steady) of composite solid propellants and their components, information about the macrokinetics of their high-temperature decomposition is required [5]. To be able to evaluate the ignition parameters and conditions of safe handling of heat-affected explosives, one needs to know the kinetic constants of their high-temperature - composition. The development of new composite solid propellants characterized by high performance characteristics (high burning rates, high thermal stability, stability to intrachamber perturbations, and other aspects) is not possible without quanti- tive data on the high-temperature decomposition of composite solid propellants and their components [6]. The same reasons have resulted in signi?cant theoretical and practical interest in the high-temperature decomposition of components of hybrid propellants. It is known that hybrid propellants have not been used very widely due to the low bu- ing (pyrolysis) rates of the polymer blocks in the combustion chambers of hybrid rocket engines. To increase the burning rates it is necessary to obtain information about their relationships to the corresponding kinetic and thermophysical prop- ties of the fuels.
Download or read book Solid Propellant Ignition by Convective Heating written by E. Karl Bastress and published by . This book was released on 1966 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of the study was to determine the effects of gas flow characteristics on solid propellant ignition behavior under convective heating. Ignition tests of three composite propellants were conducted in a hot-gas tunnel designed for convective heating experiments. Effects of gas velocity, test chamber configuration, and approach surface material on ignition were observed. It is concluded that ignition is initiated in the gas phase and is influenced by the local temperature and the local concentration of oxidizer decomposition products from upstream portions of the propellant surface. Either temperature or oxidizer concentration may control the time of ignition. When oxidizer concentration is controlling, the test configuration and gas velocity are important parameters. When temperature is controlling, ignition time can be correlated with heating rate alone. However, long propellant samples must be used to obtain meaningful data. Ignition times measured with long propellant samples are considerably lower than those measured with small samples. (Author).
Download or read book Research on the Ignition of Solid Propellants written by Martin Summerfield and published by . This book was released on 1969 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The specific areas of research to be reported on here fall under several headings, as follows: (1) ignition of solid fuels and solid propellants by heat conduction (shock tube); (2) theory of ignition in steady and nonsteady diffusion flames; (3) ignition by intense radiation (experiments with CW IR laser); (4) theory of ignition by radiation; (5) ignition in a convective flow field (shock tunnel experiments). The general objective of the work in all of these areas is an increased understanding of ignition in a rocket motor environment which will yield ultimately, design principles and rules useful to the rocket motor engineer. (Author).
