Download or read book An Investigation of the Effects of Acceleration and Strand Length on Post Fire Residue of Aluminized Propellants written by David Eugene Cowles and published by . This book was released on 1970 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aluminized propellant strand lengths from one-quarter to two inches were burned at accelerations from zero to 1000g at a mean combustion pressure of 500 psia to study the effect of acceleration and strand length on burning rate augmentation. Propellant ammonium perchlorate oxidizer size and base burning rate were varied to investigate their effects. Each post-fire residue was photographically recorded and chemical analysis was performed by X-Ray powder diffraction. Burning rate augmentation decreased and residue weight increased when the strand length was increased. Aluminum and aluminum oxide were identified at low accelerations independent of strand length; aluminum oxide was not detectable at high accelerations. Ammonium perchlorate size and base burning rate had little effect on the functional dependence of residue weight on burn time. The Crowe, et al., model was found to indicate the correct augmentation trend as a function of burn time if the time-history of the metallic agglomerates is known. (Author).
Download or read book An Investigation of the Effects of Acceleration and Strand Length on Post Fire Residue of Aluminized Propeliants written by David Eugene Cowles and published by . This book was released on 1970 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compilation of Abstracts of Dissertations Theses and Research Papers Submitted by Candidates for Degrees written by Naval Postgraduate School (U.S.) and published by . This book was released on 1969 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of the Effect of Aluminum Size and Loading on the Burning Rate of Solid Propellants Under Acceleration written by G. Burton Northam and published by . This book was released on 1969 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Effects of Normal Acceleration on Transient Burning rate Augmentation of an Aluminized Solid Propellant written by G. Burton Northam and published by . This book was released on 1972 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Instantaneous burning rate data for a polybutadiene acrylic acid propellant, containing 16 weight percent aluminum, were calculated from the pressure histories of a test motor with 96.77 sq cm of burning area and a 5.08-cm-thick propellant web. Additional acceleration tests were conducted with reduced propellant web thicknesses of 3.81, 2.54, and 1.27 cm. The metallic residue collected from the various web thickness tests was characterized by weight and shape and correlated with the instantaneous burning rate measurements. Rapid depressurization extinction tests were conducted in order that surface pitting characteristics due to localized increased burning rate could be correlated with the residue analysis and the instantaneous burning rate data. The acceleration-induced burning rate augmentation was strongly dependent on propellant distance burned, or burning time, and thus was transient in nature. The results from the extinction tests and the residue analyses indicate that the transient rate augmentation was highly dependent on local enhancement of the combustion zone heat feedback to the surface by the growth of molten residue particles on or just above the burning surface. The size, shape, and number density of molten residue particles, rather than the total residue weight, determined the acceleration-induced burning rate augmentation.
Download or read book An Investigation of the Effects of Acceleration on the Burning Rates of Solid Propellants written by David W. Netzer and published by . This book was released on 1969 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The acceleration sensitivity of aluminized and nonmetallized composite and double-base propellants were investigated. A review of previous experimental findings and current analytical models was also conducted. An investigation was conducted to determine the cause(s) for the differences in burning rate augmentation data reported by various investigators. Strand length (burn time) was found to be the dominant factor. Lead and copper additives commonly found in double-base propellants were found to decrease the burning rate with increasing acceleration. Burning rate instability was also obtained at high accelerations. The addition of aluminum increased the burning rate at any given acceleration. (Author).
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 An Investigation of the Effect of Acceleration on the Burning Rate of Composite Propellants written by James Bruce Anderson and published by . This book was released on 1966 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: The average burning rates of composite solid rocket propellant were measured in acceleration fields up to 2000 times the standard acceleration of gravity. The acceleration vector was perpendicular to and into the burning surface. Propellant strands were burned in a combustion bomb mounted on a centrifuge, and surge tanks were employed to ensure essentially constant pressure burning at 500, 1000, and 1500 psia. The burning rates of both aluminized and non-aluminized composite propellants were found to depend on acceleration. The effect of acceleration on burning rate was found to depend on the burning rate of the propellant without acceleration, aluminum mass loading, and aluminum mass median particle size. The relative burning rate increase was found to be greater for slow burning propellant than for faster burning propellants. The experimental results are compared to the analytical models proposed by Crowe for aluminized propellants and by Glick for non-aluminized propellants. The results indicate that these models do not adequately predict the observed relative burning rate increase with acceleration, and hence, that more complex modeling will be required to explain the observed acceleration effect. (Author).
Download or read book An Investigation of the Effect of Acceleration on the Burning Rate of Composite Propellants written by and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The average burning rates of composite solid rocket propellant were measured in acceleration fields up to 2000 times the standard acceleration of gravity. The acceleration vector was perpendicular to and into the burning surface. Propellant strands were burned in a combustion bomb mounted on a centrifuge, and surge tanks were employed to ensure essentially constant pressure burning at 500, 1000, and 1500 psia. The burning rates of both aluminized and non-aluminized composite propellants were found to depend on acceleration. The effect of acceleration on burning rate was found to depend on the burning rate of the propellant without acceleration, aluminum mass loading, and aluminum mass median particle size. The relative burning rate increase was found to be greater for slow burning propellant than for faster burning propellants. The experimental results are compared to the analytical models proposed by Crowe for aluminized propellants and by Glick for non-aluminized propellants. The results indicate that these models do not adequately predict the observed relative burning rate increase with acceleration, and hence, that more complex modeling will be required to explain the observed acceleration effect. (Author).
Download or read book Master s Theses and Doctoral Dissertations in the Pure and Applied Sciences written by and published by . This book was released on 1972 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effect of Acceleration on the Burning Rates of Composite and Double Base Solid Propellants written by David W. Netzer and published by . This book was released on 1968 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report discusses four experimental investigations: (1) The effect of propellant strand size on the experimentally measured burning rate at various acceleration levels; (2) an investigation of the effect of initial propellant temperature on acceleration induced burning rate augmentation; (3) an investigation of the effect of nominal burning rate on acceleration induced burning rate augmentation; and (4) a photographic investigation of augmented burning rate. Significance of the investigation and a brief review of the literature are presented.
Download or read book Effects of Propellant Composition Variables on Accleration induced Burning rate Augmentation of Solid Propellants written by G. Burton Northam and published by . This book was released on 1972 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Experimental Investigation of the Effect of Aluminum Size and Loading on the Burning Rate of Solid Propellants Under Acceleration written by G. Burton Northam and published by . This book was released on 1969 with total page 25 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 and published by . This book was released on 1982 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this initial investigation was to develop and compare experimental techniques that could be used for obtaining quantitative data on the effects of propellant properties, operating pressure and nozzle geometry on the behavior of metallized particulates within the grain port and nozzle of solid propellant rocket motors. The techniques employed were high speed motion pictures of strand burners and slab burners in a cross-flow environment, SEM analysis of post-fire residue (strand, slab, and motor), determination of D32 at the exit of an exhaust nozzle using measurements of scattered laser power spectra, and holograms of burning propellant strands and slabs in a cross-flow environment. All techniques were successfully developed and employed to obtain particulate size data from a series of specially formulated propellants. The motion picture and holographic techniques were successfully demonstrated for operating pressures of 34 and 68 atm. and with up to 15% aluminum. Fourteen micrometer resolution was obtained in the high speed motion pictures with a 1. 12X magnification (and very small depth of field) and eleven micrometer resolution was obtained in the holograms. Measurements of D32 at the nozzle exit plane of a small end-burning motor were in close agreement with size analysis of collected exhaust particulates.
Download or read book The Effects of Aluminum Particle Size on Aluminized Propellant Combustion written by Allan Dokhan and published by . This book was released on 2002 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Investigation of Solid Propellant Combustion in Standard and High Acceleration Environments written by Michael Abraham and published by . This book was released on 1974 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonmetallized double-base and composite propellant, metallized composite propellant, and ammonium perchlorate (AP)/binder sandwich combustion were studied in standard and high acceleration environments. Experimental techniques used were high speed motion pictures, tow-color schlieren, laser schlieren, and centrifuge mounted combustion bombs. It was found for double-base propellant that the temperature increased continuously from the surface into the visible flame. Acceleration induced burning rate augmentation occurred and resulted in elimination of the visible flame. Acceleration apparently modified the surface or subsurface zones. AP/binder sandwich combustion was also found to be acceleration sensitive with binder flow-AP interactions proposed as the mechanism. Composite propellants burned with local diffusion flames to pressures as slow as 100 psi. A comparison is made between AP/binder sandwich combustion and propellant combustion. (Author).
Download or read book An Experimental Investigation of Strand Burning Metallized Solid Propellants written by and published by . This book was released on 1989 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Characteristics of the products of combustion of metallized solid propellant strands at pressures between 250 and 750 psi were investigated using holography and light scattering measurements. In addition, scanning electron microscope and light scattering measurements were used to examine quenched residue. A reduced smoke ZrC propellant and three propellants of varying aluminum loading (2%, 4.8%, and 16%) were examined. The objective of the experiments was to provide to determine if any correlation of results from this method of analysis could be made with results from other more complex solid propellant motor measurements, such as plume probe and signature measurements. The results of these efforts reflected the inability of any single technique of analysis to completely describe particle size distributions. These results also suggest the need for modification of current experimental apparatus and procedures. (JES).
