Download or read book An Experimental Study of Solid Propellant Deflagration Using High Speed Motion Pictures and Postfire Residue Analysis written by Vincent Daniel DiLoreto and published by . This book was released on 1980 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt: Six aluminized propellants were investigated through strand burning in a windowed combustion bomb at 500 psi and 1000 psi. Postfire particle residues were analyzed with a scanning electron microscope and found to have bi-modal size distributions. The mean diameter of the fine particle distribution was approximately 10 microns in all cases while the mean diameter of the coarse particles was approximately the same size as the initial aluminum cast in the propellant. Measurements taken from the high speed motion pictures included resolution, propellant burning rate, the diameter of the burning particles ejected from the surface, and vertical velocity of burning particles. The diameters of burning particles were approximately 7 to 12 times the diameter of the initial aluminum cast in the propellant. Aluminum size had only small effects on burning rate. The smallest particle that could be accurately resolved with the motion pictures was approximately 60 microns. (Author).
Download or read book Masters Theses in the Pure and Applied Sciences written by Wade Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Data Analysis and Synthesis (CINDAS) * at Purdue University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volume were handled by an international publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 26 (thesis year 1981) a total of 11 ,048 theses titles from 24 Canadian and 21 8 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 26 reports theses submitted in 1981, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1984 with total page 558 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of Experimental Techniques for Obtaining Particulate Behavior in Metallized Solid Propellant Combustion written by R. G. Cramer and published by . This book was released on 1984 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: A continuing investigation is being conducted to develop techniques which can be used to obtain quantitative data that can be used to relate solid rocket propellant composition and operating environment to the behavior of solid particulates within the grain port and exhaust nozzle. The techniques employed are high speed motion pictures of propellant strand burners and slab burners in a cross-flow environment, SEM analysis of post-fire residue (strand, slab, and motor), determination of D32 across the exhaust nozzle using measurements of scattered laser light, and holograms of burning propellant strands and slabs in a cross-flow environment. In addition, work has been initiated to develop automatic data retrieval methods for obtaining particle size distributions from holograms taken of the combustion of solid propellants. Actual particle size of burning aluminum particles were obtained in high speed motion pictures by using high intensity rear illumination of the burning propellants to eliminate the flame envelopes surrounding the burning particles. Measurements of diffractively scattered light were successfully made for determination of changes in D32 across a solid propellant rocket motor exhaust nozzle. However, to date, propellant composition and grain geometry have significantly limited the range of obtainable data. Two-dimensional motors have been successfully employed to obtain good quality holograms of propellant burned in a cross-flow environment. A Quantimet 720 has been used in an initial effort to obtain particle size distributions from a photograph taken of a reconstructed hologram.
Download or read book Technical Abstract Bulletin written by and published by . This book was released on 1981 with total page 204 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 199? with total page 1192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurements of Particulates in Solid Propellant Rocket Motors written by and published by . This book was released on 1987 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: An investigation has been conducted to develop techniques for obtaining quantitative data that can be used to relate solid rocket propellant composition and operating environment to the behavior of solid particulates within the grain port and exhaust nozzle. The techniques employed are high speed motion pictures of propellant strand burners and slab burners in a cross-flow environment, SEM analysis of post-fire residue (strand, slab, and motor), determination of D32 across the exhaust nozzle using measurements of scattered laser light, and holograms of burning propellant strands, slabs, and motors. In addition, techniques are being developed for automatic retrieval of particular size distributions from holograms taken of the combustion of solid propellants. Results are presented on (1) the measurement of particular size changes across an exhaust nozzle, (2) holograms obtained at the nozzle entrance, and (3) automatic data retrieval from holograms. Keywords: Solid propellants, Particular sizing, Holograms, Particulates, Optical methods, Speckel reduction.
Download or read book Turbulent Boundary Layer Analysis and Experimental Investigation of Erosive Burning Problem of Composite Solid Propellants written by Mohan K. Razdan and published by . This book was released on 1978 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to investigate the frequently encountered phenomenon of erosive burning of composite solid propellants in rocket motors. Both theoretical and experimental studies were undertaken. In the theoretical model, the propellant burning process was described by considering a steady, two-dimensional, chemically reacting, turbulent boundary layer over a propellant surface. The diffusion-controlled gas-phase chemical reaction was modeled on the basis of the eddy-break-up concept. The theoretical model, comprised of a set of partial differential equations, was solved numerically. In the experimental work, a flat composite-propellant slab was burned in a test chamber by the flow of hot combustion gases which formed a turbulent boundary layer over the surface of the propellant. The burning rate of the propellant was measured by a high-speed motion picture technique at various pressures and free-stream velocities. Comparison of the theoretical results with the experimental data, obtained from the present study and that obtained from existing literature, showed a close agreement.
Download or read book Experimental Study of the Composite Solid Propellant Deflagration Process on a Fundamental Level written by Robert F McAlevy (III.) and published by . This book was released on 1973 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigations over an eleven-year period of the overall mechanism of composite solid propellant deflagration and its component processes are summarized. Experimental studies and techniques involving diagnostic measurements on analog burners (of several types) and characterizations of the linear pyrolysis of propellant ingredients (polymers and ammonium perchlorate) are included along with efforts at modeling the overall mechanism. All publications resulting from the work reported are cited. (Author).
Download or read book A Preliminary Investigation of the Destruction of Solid propellant Rocket Motors by Impact from Small Particles written by David J. Carter (Jr.) and published by . This book was released on 1960 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Schlieren Study of Composite Propellant Combustion written by Robert Ross Gerhardt and published by . This book was released on 1974 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: A photographic investigation of metallized and non-metallized composite solid propellant combustion was made. Propellant strands made from large unimodal AP and PBAN binder, both with and without aluminum powder, were burned in a conventional stainless steel combustion bomb. High speed color Schlieren motion pictures were taken of the combustion process to determine the effects of pressure and strand thickness on propellant deflagration. Results are discussed and compared with data on AP/binder sandwich experiments. (Author).
Download or read book Pulsed Laser High Speed Photography of Rocket Propellant Surface Deflagration written by Roger J. Becker and published by . This book was released on 1986 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: High speed movies of solid propellant deflagration have long provided useful qualitative information on propellant behavior. Consequently, an extension of performance to include quantitative behavior of the surface, particularly the spatial relationship of particles across the surface, the temporal behavior of particles through extended periods of time, and accurate measurements of particle sizes, is highly desirable. Such measurements require the ability to take detailed movies across an extensive surface through the propellant flame for longer periods than the residence time of a given particle. For such experiments, camera optics employing magnification are undesirable, since they severely limit both the field of view and the depth of field, and hence, the useful duration of a frame sequence. Unfortunately, high resolution without magnification pushes both the diffraction limits and the performance capabilities of standard lenses. At this limit, the modulation transfer function (MTF) of the camera optics and film will greatly affect performance. The MTF of the optics can be improved by a factor of two or more at practical spatial frequencies by the use of monochromatic light, such as the reflected light from a laser. This is especially true for off-axis rays, and important consideration when an extended field-of-view is required. The use of an intense, short-pulsed laser has the additional advantage of suppressing flame brightness and motion blur. Such a light source must retain a high repetition rate to follow temporal behavior in detail.
Download or read book Experimental Study of the Deflagration of Gases and Solids written by A. Van Tiggelen and published by . This book was released on 1966 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: First a general survey is given of the research undertaken under this grant. Three topics have progressed during the last year in a sufficient manner as to be reported in this document. (I) Burning velocity, flame temperature and reaction zone thickness are reported for gaseous mixtures of hydrogen cyanide, oxygen and nitrogen at different richnesses and dilutions. Accepting the model of an homogeneous reaction for the flame reaction zone, global activation energies and reaction orders are derived. (II) The application of a new technique (simulating burner) allows the estimation of the amount of heat transferred from the flame reaction zone upstream to the burning surface of a solid propellant. Some preliminary data are presented for given conditions of flow and zeroeth degree of mixedness in the preparation zone upstream of the flame. (III) The comparative intensities of CH or C2 show that the yield of excited C2 or CH radicals per molecule of fuel oxidized in the flame is about 1.4 times larger in isobutane than in normal butane flames (with oxygen) at the same richness and degree of dilution with nitrogen. (Author).
Download or read book Experiments on the Ignition of Composite Solid Propellants written by PHILIP L. COWAN and published by . This book was released on 1960 with total page 1 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study of composite solid propellant ignition was undertaken. A shock tube was used to generate high temperature gas to supply the ignition energy to the propellant samples under test. Two propellant configurations are described; a flush mounted sample in the end wall and a string mounted sample on the axis of the tube. The propellant mounting procedure is described and the problems encountered are discussed in detail. Three types of propellant were tested and the results are presented. Ignition times are measured by means of two phototubes viewing the propellant through quartz windows in the shock tube. The problems associated with the detection of ignition by this method are discussed. A high speed framing camera for observation of ignition is described and the photographic results are presented. Film processing techniques are outlined. The purpose of this report is to present only the experimental technique for the study of ignition in a shock tube and some typical results. (Author).
Download or read book A Preliminary Investigation on the Destruction of Solid Propellant Rocket Motors by Impact from Small Particles written by David J. Carter (Jr.) and published by . This book was released on 1960 with total page 34 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 Cinematographic Study of Solid Propellant Combustion in an Acceleration Field written by Raymond Charles Schroeder (Jr) and published by . This book was released on 1970 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of an acceleration field on the combustion rate of a composite solid propellant when directed normally and into the burning surface was recorded by high speed cinematography. One-half to one-inch long propellant strands with 1/4-in by 1/4-in cross sections were burned and photographed at pressures of 200 psi and 500 psi while subjected to normal acceleration fields of 0 g and 75 g. Aluminized propellants were primarily utilized in this investigation; however, the experimental apparatus and the techniques used proved suitable for general propellant studies. Propellants burning in acceleration fields of 0 g and 75 g were successfully filmed at frame rates of 4500 pictures per second. The designed magnification factor and the quality of the motion pictures produced provided an optical definition of particle sizes to 100 microns. This film resolution allowed an optical analysis of the acceleration effects on propellant burning rates. (Author).
